Subwoofer Confidential File In fact, a car audio system without a subwoofer can also play a sound effect that is sufficient for listening. However, with the subwoofer equipment, you can adjust the sound to bring a wider sound field extension, more soft bass texture, or exaggerate the subwoofer to bring powerful and powerful sound pressure effect... In other words, with the presence of a subwoofer, the fun of playing on the car will be even more fascinating.
While having a subwoofer, there are often many annoying technical problems. Below, the author will introduce the readers to the operation principle of the subwoofer, the type of subwoofer, and various tuning techniques related to the subwoofer. The positioning of the subwoofer in the car audio system has a clearer understanding!
Why do you have a subwoofer?
Why is there a subwoofer system in the sound of a car? Everyone knows that the frequency of the sound that can be heard by the human ear is about 20Hz to very high frequency of 20,000Hz. Generally, the configuration of the multi-sound car audio speaker, the high-pitched single to cover the 20,000Hz frequency is not a problem. However, if many 5-inch and 6-inch semi-common woofer units are limited by the performance of the horn cone area and the operating stroke, it can be played in the car if it can play 60Hz. Awesome, some of the worse speakers, or the poor installation conditions, the bass alone even has a low frequency sound below 100Hz is difficult!
What if the music below the frequency below 100Hz sounds? The bass is hard and hard, the drum sounds rigid, the strength and the texture of the knocking are lost. The wideness and extension of the whole sound field are limited. The music is like a triangle that is inserted into the ground. The top-heavy has no authority and no stable taste. At the same time, you will not feel that listening to music has a great touch, listening to singing has a warm taste... So, don't underestimate the small frequency range from 20Hz to 100Hz, and lose the music of these two octaves. It sounds not perfect.
In order to make up for the extremely low frequency that the subwoofer can't interpret, we have to add a so-called subwoofer, subwoofer, or ultra-low speaker to the car, so that the music's extremely low frequency domain can also have a perfect performance!
Subwoofer is not equal to bass
Still this topic: Do you need to modify the subwoofer system in the car? For those who are looking to listen to the perfect sound, of course! But if you just want to install a subwoofer in the car, strengthen the bass rhythm, and show off to the world that you have perfect sound quality, then I will advise you to save the money! Because the rhythm in music is called "bass" instead of "subwoofer", instead of spending money on ultra-low speakers to pursue bass, it is better to change a better mid-woofer to enhance the sound insulation and vibration of the speaker installation (for example, before The door), the improved bass effect will be more obvious.
Of course, if you don't care about the balance of sound quality, only the sound pressure of auditory stimulation, the subwoofer can also be used as a tool to push the bass, and this is another fun way to play car audio!
â—Types of ultra low speakers
Looking closely at the products or architecture of the various subwoofers in the car, you will find that they all have a common feature, the "box structure." This is because the energy of the subwoofer wave is very large and the diffusion is strong. If the sound wave of one side of the subwoofer is moved through the box structure, the sound waves on the opposite sides of the cone will interfere with each other. Offset, can not achieve the desired sound effect, so no matter what subwoofer, ultra-low speaker, or popular glass fiber ultra-low speaker, you will find that the speakers are installed in a "box" on!
According to different speaker characteristics and usage requirements, the cabinet structure of the subwoofer has also derived many different shapes and appearances. However, in summary, the types of ultra-low speaker body structures on the car can not escape the closed type, low frequency reflection type, and infinite baffle type. , push-pull, frequency band design:
1. Closed speaker:
Using a closed speaker on a car stereo is the least error-prone and easiest to configure subwoofer mode. As the name implies, when the subwoofer is installed in the speaker, the space of the whole box is isolated from the outside and sealed. Therefore, when the horn cone is pushed outward, according to the atmospheric pressure principle, a reaction of inward suction is also generated in the box. Force, pulling the horn cone intoward; on the contrary, when the horn cone is working inward, the air in the speaker will also push outward. Therefore, the advantage of the closed type speaker is that the air in the speaker is used to pull the movement of the speaker cone, so that the subwoofer can be retracted faster and the sound is cleaner, and the volume of the speaker does not need to be made large to achieve the desired super Bass effect, but the disadvantage is that the amplifier that requires a large output power can effectively drive the speaker.
2. Low frequency reflective speaker:
The low-frequency reflective speaker is simply a closed-type speaker with a vent pipe, so that a part of the air pressure in the box can flow in and out through the vent pipe during the operation of the horn to increase the effect of the extremely low frequency extension. However, the vent pipe of the low-frequency reflective speaker is not randomly opened, and the data such as the diameter, length, and volume of the box must be accurately calculated according to the various performance data of the subwoofer to obtain the desired sound!
3. Infinite Barrier:
Free-Air is a very special subwoofer mode. It does not install the subwoofer in the speaker structure, but uses the luggage compartment space of the vehicle as a speaker. Therefore, the advantage is that it can be saved. Go to the speaker space and let the luggage compartment carry a little more cargo, but the disadvantage is that when the luggage compartment contains items, the change of the entire luggage compartment volume will affect the appearance of the subwoofer! Another important point is that the volume of the luggage compartment of the vehicle often has hundreds of liters. For the normal resonance volume of the subwoofer (about 20-50 liters), it is too big, so the infinite baffle structure is super. The sound quality of the bass system is often unsatisfactory.
4. Push-pull speaker:
This ultra-low speaker was first proposed by the home audio brand Linn. Its design concept is like two electric fans placed close to each other. One fan blows another fan and turns together to generate stronger wind. It is to replace the electric fan with a subwoofer, and one unit pushes the other unit to work synchronously to produce a stronger subwoofer effect, which is the operation principle of the push-pull speaker.
5. Band speaker:
The band speaker is the most difficult to design and manufacture in all the speakers. The box is divided into inner and outer layers. The subwoofer is installed on the inner box that is isolated from the outside, only through the outer box. The vent pipe communicates with the outside of the box. The most special part of the band speaker is that as long as the volume and snorkel are designed correctly, it can produce a bandpass crossover effect, which allows the subwoofer to be limited to a certain frequency output, but it is difficult to design. The cost is high, and the proportion used in car audio is not high!
Of course, there are many other design modes for ultra-low speakers, such as horn and transmission line...but the technology and cost requirements of the production are quite high, so they are rarely used in car audio, so I won't go into details here.
Sound change little sloppy
There are quite a few myths about the subwoofers in the car audio industry. Some of them sound like whims to the extreme. Here are a few tips for the readers:
1. "Want to listen to music and rush and bring strength, it is right to install ultra-low speakers": This argument is really feasible for those who do not pay attention to sound quality, sound field correctness, and only seek sound pressure stimulation, because you As long as the low-pass crossover point of the subwoofer is raised to overlap with the working frequency range of the woofer, the volume of the bass can be greatly increased. However, this extremely inflated bass is definitely not the right sound, and it sounds absolutely impulsive and not good.
2. “Ultra-low speakers can be installed as long as the speaker holes are the same size. Any subwoofer can be installed.†The mechanical characteristics of each subwoofer are different. Suppose a speaker recommends a speaker installation volume of 20 liters and another. It is 40 liters. As a result, both speakers are mounted on the same type of speakers. Do you want them to have the same sound effect? A truly professional approach, you still have to use the original test data set formula of the speaker to calculate the volume of the matching speaker, in order to get the best subwoofer effect.
3. "Two different brands and models of subwoofers can be used on the same speaker." I don't know if this is because the audio store speaker is out of stock or is due to other design considerations. Basically, it is different. The brand and model of the subwoofer have different mechanical characteristics. Therefore, if one speaker moves quickly and the other speaker is like a slow jump, the subwoofer that is launched is not like a ghost fight. pole? Therefore, two different brands and models of speakers are installed on the same speaker, and in most cases, it is not feasible.
4. “Because the subwoofer is installed in the trunk of the car, the sound is coming from behind.†If you meet a car audio store owner and tell you this, you can ask him: Why don’t you have a home store? The sound of the sound does not sound like it came from behind? Basically, as long as the subwoofer system is installed correctly, the phase, crossover, and volume are adjusted properly. The subwoofer you hear should be in the front of the driver's seat and reach a good connection with the bass.
5. “The position of the subwoofer system for the convertible and the two-seat sports car is in the luggage compartmentâ€: We all know that the ideal position for the general car to install the subwoofer system is the rear luggage compartment, but if you encounter a two-seat convertible like the Mercedes SLK Cars, even Porsche, Ferrari, rear-engine sports cars have to change the subwoofer, the installation method is not a rigid board to hardly subwoofer to the luggage compartment! Imagine that there is a thick layer of sheet metal between the luggage compartment of the sports car and the passenger compartment. The subwoofer is placed in the luggage compartment. How can Boeing pass into the passengers? Therefore, in the case of this special case of the sports car to modify the subwoofer system, it is still a special shape of the speaker, installed in the foot position in front of the deputy seat is!
â—Super bass tuning method
Assume that the sound system in your car has an electronic sound distribution device, or a built-in pre-stage crossover function on the main unit and the power amplifier (it is difficult to modify the subwoofer without these functions), then install a set of subwoofers on the car. After the system, there will be three tuning steps: subwoofer phase, subwoofer and bass crossover and volume setting. Before the start of the three tuning steps, we must first set the high-pass crossover point of the woofer in the car. Basically, the mid-woofer can be extended downwards to play the lower the frequency, but due to physical limitations, the woofer in the general car audio is installed on the front door panel that has been sound-proof and vibration-treated. More down to 60-70Hz, the low frequency will continue to be loose and fuzzy, so we grab the woofer's high-pass crossover point, which can be set from about 65-90Hz to filter out the woofer. A loose band that is too low is preferred.
1. Subwoofer phase setting: As long as the subwoofer is working, it will produce a phase problem of the sound. If the basic problem of this subwoofer setting is not adjusted, the sound and subwoofer of the subwoofer system may be formed. The sounds that are played are fighting each other, that is, the more the subwoofer system is set, the less the bass sounds. In actual adjustment, you only need to test from the crossover setting on the electronic crossover or amplifier. When you find that the subwoofer low-pass crossover point is set higher and the volume is louder, the bass in the music will sound more. Less, that is, the phase setting is wrong, you must correct the subwoofer phase by phase adjustment or reverse connection of the subwoofer cable!
2. Subwoofer crossover point setting: In car audio, the subwoofer low-pass crossover point setting not only involves the balance of music listening, but also involves the correctness of the sound field! You may have heard that some people say that because the subwoofer on the car is installed in the rear luggage compartment, the subwoofer should also be driven forward by the car. But think about it, did someone listen to the concert and put the stereo speaker behind the head? This is definitely not the right sound concept! Therefore, even if the subwoofer on the car is installed in the rear luggage compartment, we still have a way to make the subwoofer sound like a passenger in front of it, and this has to use a little acoustic theory - the higher the sound frequency, the stronger the orientation. The lower the frequency, the more diffused and undirected the sound. So in general, when we set the low-pass crossover point of the subwoofer between 55-75Hz, such a low frequency is not easy to produce directionality, that is, it is not heard in the human ear. It's easy to hear that the subwoofer is coming out from behind the head, and with the good crossover of the woofer in the front of the car, you will hear the subwoofer and the correct sound field. .
In addition, the reader should know that even if the low-pass crossover point of the subwoofer is set in the frequency range of 55-75Hz, the musicality will still have different changes. Basically, the lower the crossover point setting, the sound field The more you stretch, the wider the bass, the softer the bass sounds; the higher the crossover point, the stronger the bass impact and the sense of strength. The two characteristics can't be combined. It depends on the listening preferences of the listeners to tune!
3. Subwoofer volume setting: The volume adjustment is the simplest and most error-prone step in the subwoofer system setting! Many people may like to taste heavy, and the volume of the subwoofer system is greatly increased to increase the bass. However, in the state where the bass is greatly increased, the subwoofer band is not excessively distorted. How can such music be heard? Therefore, the correct subwoofer volume adjustment, in fact, as long as the subwoofer sounds a little bit feels enough, the main bass should still come from the mid-woofer on the car.
Please note that the above-mentioned subwoofer tuning method is more inclined to correct sound quality and sound field setting, which is completely different from the sound pressure tuning method!
Subwoofer Confidential File In fact, a car audio system without a subwoofer can also play a sound effect that is sufficient for listening. However, with the subwoofer equipment, you can adjust the sound to bring a wider sound field extension, more soft bass texture, or exaggerate the subwoofer to bring powerful and powerful sound pressure effect... In other words, with the presence of a subwoofer, the fun of playing on the car will be even more fascinating.
While having a subwoofer, there are often many annoying technical problems. Below, the author will introduce the readers to the operation principle of the subwoofer, the type of subwoofer, and various tuning techniques related to the subwoofer. The positioning of the subwoofer in the car audio system has a clearer understanding!
Why do you have a subwoofer?
Why is there a subwoofer system in the sound of a car? Everyone knows that the frequency of the sound that can be heard by the human ear is about 20Hz to very high frequency of 20,000Hz. Generally, the configuration of the multi-sound car audio speaker, the high-pitched single to cover the 20,000Hz frequency is not a problem. However, if many 5-inch and 6-inch semi-common woofer units are limited by the performance of the horn cone area and the operating stroke, it can be played in the car if it can play 60Hz. Awesome, some of the worse speakers, or the poor installation conditions, the bass alone even has a low frequency sound below 100Hz is difficult!
What if the music below the frequency below 100Hz sounds? The bass is hard and hard, the drum sounds rigid, the strength and the texture of the knocking are lost. The wideness and extension of the whole sound field are limited. The music is like a triangle that is inserted into the ground. The top-heavy has no authority and no stable taste. At the same time, you will not feel that listening to music has a great touch, listening to singing has a warm taste... So, don't underestimate the small frequency range from 20Hz to 100Hz, and lose the music of these two octaves. It sounds not perfect.
In order to make up for the extremely low frequency that the subwoofer can't interpret, we have to add a so-called subwoofer, subwoofer, or ultra-low speaker to the car, so that the music's extremely low frequency domain can also have a perfect performance!
Subwoofer is not equal to bass
Still this topic: Do you need to modify the subwoofer system in the car? For those who are looking to listen to the perfect sound, of course! But if you just want to install a subwoofer in the car, strengthen the bass rhythm, and show off to the world that you have perfect sound quality, then I will advise you to save the money! Because the rhythm in music is called "bass" instead of "subwoofer", instead of spending money on ultra-low speakers to pursue bass, it is better to change a better mid-woofer to enhance the sound insulation and vibration of the speaker installation (for example, before The door), the improved bass effect will be more obvious.
Of course, if you don't care about the balance of sound quality, only the sound pressure of auditory stimulation, the subwoofer can also be used as a tool to push the bass, and this is another fun way to play car audio!
â—Types of ultra low speakers
Looking closely at the products or architecture of the various subwoofers in the car, you will find that they all have a common feature, the "box structure." This is because the energy of the subwoofer wave is very large and the diffusion is strong. If the sound wave of one side of the subwoofer is moved through the box structure, the sound waves on the opposite sides of the cone will interfere with each other. Offset, can not achieve the desired sound effect, so no matter what subwoofer, ultra-low speaker, or popular glass fiber ultra-low speaker, you will find that the speakers are installed in a "box" on!
According to different speaker characteristics and usage requirements, the cabinet structure of the subwoofer has also derived many different shapes and appearances. However, in summary, the types of ultra-low speaker body structures on the car can not escape the closed type, low frequency reflection type, and infinite baffle type. , push-pull, frequency band design:
1. Closed speaker:
Using a closed speaker on a car stereo is the least error-prone and easiest to configure subwoofer mode. As the name implies, when the subwoofer is installed in the speaker, the space of the whole box is isolated from the outside and sealed. Therefore, when the horn cone is pushed outward, according to the atmospheric pressure principle, a reaction of inward suction is also generated in the box. Force, pulling the horn cone intoward; on the contrary, when the horn cone is working inward, the air in the speaker will also push outward. Therefore, the advantage of the closed type speaker is that the air in the speaker is used to pull the movement of the speaker cone, so that the subwoofer can be retracted faster and the sound is cleaner, and the volume of the speaker does not need to be made large to achieve the desired super Bass effect, but the disadvantage is that the amplifier that requires a large output power can effectively drive the speaker.
2. Low frequency reflective speaker:
The low-frequency reflective speaker is simply a closed-type speaker with a vent pipe, so that a part of the air pressure in the box can flow in and out through the vent pipe during the operation of the horn to increase the effect of the extremely low frequency extension. However, the vent pipe of the low-frequency reflective speaker is not randomly opened, and the data such as the diameter, length, and volume of the box must be accurately calculated according to the various performance data of the subwoofer to obtain the desired sound!
3. Infinite Barrier:
Free-Air is a very special subwoofer mode. It does not install the subwoofer in the speaker structure, but uses the luggage compartment space of the vehicle as a speaker. Therefore, the advantage is that it can be saved. Go to the speaker space and let the luggage compartment carry a little more cargo, but the disadvantage is that when the luggage compartment contains items, the change of the entire luggage compartment volume will affect the appearance of the subwoofer! Another important point is that the volume of the luggage compartment of the vehicle often has hundreds of liters. For the normal resonance volume of the subwoofer (about 20-50 liters), it is too big, so the infinite baffle structure is super. The sound quality of the bass system is often unsatisfactory.
4. Push-pull speaker:
This ultra-low speaker was first proposed by the home audio brand Linn. Its design concept is like two electric fans placed close to each other. One fan blows another fan and turns together to generate stronger wind. It is to replace the electric fan with a subwoofer, and one unit pushes the other unit to work synchronously to produce a stronger subwoofer effect, which is the operation principle of the push-pull speaker.
5. Band speaker:
The band speaker is the most difficult to design and manufacture in all the speakers. The box is divided into inner and outer layers. The subwoofer is installed on the inner box that is isolated from the outside, only through the outer box. The vent pipe communicates with the outside of the box. The most special part of the band speaker is that as long as the volume and snorkel are designed correctly, it can produce a bandpass crossover effect, which allows the subwoofer to be limited to a certain frequency output, but it is difficult to design. The cost is high, and the proportion used in car audio is not high!
Of course, there are many other design modes for ultra-low speakers, such as horn and transmission line...but the technology and cost requirements of the production are quite high, so they are rarely used in car audio, so I won't go into details here.
Sound change little sloppy
There are quite a few myths about the subwoofers in the car audio industry. Some of them sound like whims to the extreme. Here are a few tips for the readers:
1. "Want to listen to music and rush and bring strength, it is right to install ultra-low speakers": This argument is really feasible for those who do not pay attention to sound quality, sound field correctness, and only seek sound pressure stimulation, because you As long as the low-pass crossover point of the subwoofer is raised to overlap with the working frequency range of the woofer, the volume of the bass can be greatly increased. However, this extremely inflated bass is definitely not the right sound, and it sounds absolutely impulsive and not good.
2. “Ultra-low speakers can be installed as long as the speaker holes are the same size. Any subwoofer can be installed.†The mechanical characteristics of each subwoofer are different. Suppose a speaker recommends a speaker installation volume of 20 liters and another. It is 40 liters. As a result, both speakers are mounted on the same type of speakers. Do you want them to have the same sound effect? A truly professional approach, you still have to use the original test data set formula of the speaker to calculate the volume of the matching speaker, in order to get the best subwoofer effect.
3. "Two different brands and models of subwoofers can be used on the same speaker." I don't know if this is because the audio store speaker is out of stock or is due to other design considerations. Basically, it is different. The brand and model of the subwoofer have different mechanical characteristics. Therefore, if one speaker moves quickly and the other speaker is like a slow jump, the subwoofer that is launched is not like a ghost fight. pole? Therefore, two different brands and models of speakers are installed on the same speaker, and in most cases, it is not feasible.
4. “Because the subwoofer is installed in the trunk of the car, the sound is coming from behind.†If you meet a car audio store owner and tell you this, you can ask him: Why don’t you have a home store? The sound of the sound does not sound like it came from behind? Basically, as long as the subwoofer system is installed correctly, the phase, crossover, and volume are adjusted properly. The subwoofer you hear should be in the front of the driver's seat and reach a good connection with the bass.
5. “The position of the subwoofer system for the convertible and the two-seat sports car is in the luggage compartmentâ€: We all know that the ideal position for the general car to install the subwoofer system is the rear luggage compartment, but if you encounter a two-seat convertible like the Mercedes SLK Cars, even Porsche, Ferrari, rear-engine sports cars have to change the subwoofer, the installation method is not a rigid board to hardly subwoofer to the luggage compartment! Imagine that there is a thick layer of sheet metal between the luggage compartment of the sports car and the passenger compartment. The subwoofer is placed in the luggage compartment. How can Boeing pass into the passengers? Therefore, in the case of this special case of the sports car to modify the subwoofer system, it is still a special shape of the speaker, installed in the foot position in front of the deputy seat is!
â—Super bass tuning method
Assume that the sound system in your car has an electronic sound distribution device, or a built-in pre-stage crossover function on the main unit and the power amplifier (it is difficult to modify the subwoofer without these functions), then install a set of subwoofers on the car. After the system, there will be three tuning steps: subwoofer phase, subwoofer and bass crossover and volume setting. Before the start of the three tuning steps, we must first set the high-pass crossover point of the woofer in the car. Basically, the mid-woofer can be extended downwards to play the lower the frequency, but due to physical limitations, the woofer in the general car audio is installed on the front door panel that has been sound-proof and vibration-treated. More down to 60-70Hz, the low frequency will continue to be loose and fuzzy, so we grab the woofer's high-pass crossover point, which can be set from about 65-90Hz to filter out the woofer. A loose band that is too low is preferred.
1. Subwoofer phase setting: As long as the subwoofer is working, it will produce a phase problem of the sound. If the basic problem of this subwoofer setting is not adjusted, the sound and subwoofer of the subwoofer system may be formed. The sounds that are played are fighting each other, that is, the more the subwoofer system is set, the less the bass sounds. In actual adjustment, you only need to test from the crossover setting on the electronic crossover or amplifier. When you find that the subwoofer low-pass crossover point is set higher and the volume is louder, the bass in the music will sound more. Less, that is, the phase setting is wrong, you must correct the subwoofer phase by phase adjustment or reverse connection of the subwoofer cable!
2. Subwoofer crossover point setting: In car audio, the subwoofer low-pass crossover point setting not only involves the balance of music listening, but also involves the correctness of the sound field! You may have heard that some people say that because the subwoofer on the car is installed in the rear luggage compartment, the subwoofer should also be driven forward by the car. But think about it, did someone listen to the concert and put the stereo speaker behind the head? This is definitely not the right sound concept! Therefore, even if the subwoofer on the car is installed in the rear luggage compartment, we still have a way to make the subwoofer sound like a passenger in front of it, and this has to use a little acoustic theory - the higher the sound frequency, the stronger the orientation. The lower the frequency, the more diffused and undirected the sound. So in general, when we set the low-pass crossover point of the subwoofer between 55-75Hz, such a low frequency is not easy to produce directionality, that is, it is not heard in the human ear. It's easy to hear that the subwoofer is coming out from behind the head, and with the good crossover of the woofer in the front of the car, you will hear the subwoofer and the correct sound field. .
In addition, the reader should know that even if the low-pass crossover point of the subwoofer is set in the frequency range of 55-75Hz, the musicality will still have different changes. Basically, the lower the crossover point setting, the sound field The more you stretch, the wider the bass, the softer the bass sounds; the higher the crossover point, the stronger the bass impact and the sense of strength. The two characteristics can't be combined. It depends on the listening preferences of the listeners to tune!
3. Subwoofer volume setting: The volume adjustment is the simplest and most error-prone step in the subwoofer system setting! Many people may like to taste heavy, and the volume of the subwoofer system is greatly increased to increase the bass. However, in the state where the bass is greatly increased, the subwoofer band is not excessively distorted. How can such music be heard? Therefore, the correct subwoofer volume adjustment, in fact, as long as the subwoofer sounds a little bit feels enough, the main bass should still come from the mid-woofer on the car.
Please note that the above-mentioned subwoofer tuning method is more inclined to correct sound quality and sound field setting, which is completely different from the sound pressure tuning method!
Subwoofer Confidential File In fact, a car audio system without a subwoofer can also play a sound effect that is sufficient for listening. However, with the subwoofer equipment, you can adjust the sound to bring a wider sound field extension, more soft bass texture, or exaggerate the subwoofer to bring powerful and powerful sound pressure effect... In other words, with the presence of a subwoofer, the fun of playing on the car will be even more fascinating.
While having a subwoofer, there are often many annoying technical problems. Below, the author will introduce the readers to the operation principle of the subwoofer, the type of subwoofer, and various tuning techniques related to the subwoofer. The positioning of the subwoofer in the car audio system has a clearer understanding!
Why do you have a subwoofer?
Why is there a subwoofer system in the sound of a car? Everyone knows that the frequency of the sound that can be heard by the human ear is about 20Hz to very high frequency of 20,000Hz. Generally, the configuration of the multi-sound car audio speaker, the high-pitched single to cover the 20,000Hz frequency is not a problem. However, if many 5-inch and 6-inch semi-common woofer units are limited by the performance of the horn cone area and the operating stroke, it can be played in the car if it can play 60Hz. Awesome, some of the worse speakers, or the poor installation conditions, the bass alone even has a low frequency sound below 100Hz is difficult!
What if the music below the frequency below 100Hz sounds? The bass is hard and hard, the drum sounds rigid, the strength and the texture of the knocking are lost. The wideness and extension of the whole sound field are limited. The music is like a triangle that is inserted into the ground. The top-heavy has no authority and no stable taste. At the same time, you will not feel that listening to music has a great touch, listening to singing has a warm taste... So, don't underestimate the small frequency range from 20Hz to 100Hz, and lose the music of these two octaves. It sounds not perfect.
In order to make up for the extremely low frequency that the subwoofer can't interpret, we have to add a so-called subwoofer, subwoofer, or ultra-low speaker to the car, so that the music's extremely low frequency domain can also have a perfect performance!
Subwoofer is not equal to bass
Still this topic: Do you need to modify the subwoofer system in the car? For those who are looking to listen to the perfect sound, of course! But if you just want to install a subwoofer in the car, strengthen the bass rhythm, and show off to the world that you have perfect sound quality, then I will advise you to save the money! Because the rhythm in music is called "bass" instead of "subwoofer", instead of spending money on ultra-low speakers to pursue bass, it is better to change a better mid-woofer to enhance the sound insulation and vibration of the speaker installation (for example, before The door), the improved bass effect will be more obvious.
Of course, if you don't care about the balance of sound quality, only the sound pressure of auditory stimulation, the subwoofer can also be used as a tool to push the bass, and this is another fun way to play car audio!
â—Types of ultra low speakers
Looking closely at the products or architecture of the various subwoofers in the car, you will find that they all have a common feature, the "box structure." This is because the energy of the subwoofer wave is very large and the diffusion is strong. If the sound wave of one side of the subwoofer is moved through the box structure, the sound waves on the opposite sides of the cone will interfere with each other. Offset, can not achieve the desired sound effect, so no matter what subwoofer, ultra-low speaker, or popular glass fiber ultra-low speaker, you will find that the speakers are installed in a "box" on!
According to different speaker characteristics and usage requirements, the cabinet structure of the subwoofer has also derived many different shapes and appearances. However, in summary, the types of ultra-low speaker body structures on the car can not escape the closed type, low frequency reflection type, and infinite baffle type. , push-pull, frequency band design:
1. Closed speaker:
Using a closed speaker on a car stereo is the least error-prone and easiest to configure subwoofer mode. As the name implies, when the subwoofer is installed in the speaker, the space of the whole box is isolated from the outside and sealed. Therefore, when the horn cone is pushed outward, according to the atmospheric pressure principle, a reaction of inward suction is also generated in the box. Force, pulling the horn cone intoward; on the contrary, when the horn cone is working inward, the air in the speaker will also push outward. Therefore, the advantage of the closed type speaker is that the air in the speaker is used to pull the movement of the speaker cone, so that the subwoofer can be retracted faster and the sound is cleaner, and the volume of the speaker does not need to be made large to achieve the desired super Bass effect, but the disadvantage is that the amplifier that requires a large output power can effectively drive the speaker.
2. Low frequency reflective speaker:
The low-frequency reflective speaker is simply a closed-type speaker with a vent pipe, so that a part of the air pressure in the box can flow in and out through the vent pipe during the operation of the horn to increase the effect of the extremely low frequency extension.ä¸è¿‡ï¼Œä½Žé¢‘åå°„å¼éŸ³ç®±çš„通气管ä¸æ˜¯éšä¾¿ä¹±å¼€çš„，其管径ã€é•¿åº¦ï¼Œæé…箱体容积ç‰çš„æ•°æ®ï¼Œéƒ½å¾—ä¾æ®è¶…低音喇åå„ç§æ€§èƒ½èµ„料精密计算制作，æ‰èƒ½å¾—到ç†æƒ³çš„声音ï¼
3. æ— é™éšœæ¿å¼ï¼š
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4. 推挽å¼éŸ³ç®±ï¼š
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5. 频段å¼éŸ³ç®±ï¼š
频段å¼éŸ³ç®±æ˜¯æ‰€æœ‰éŸ³ç®±ä¸æœ€éš¾è®¾è®¡ä¸Žåˆ¶ä½œçš„一ç§ï¼Œå…¶ç®±ä½“分为内ã€å¤–两层，超低音喇å安装在与外界隔ç»çš„内层箱体上，åªé€è¿‡å¤–层箱体上的通气管与箱外相通。频段å¼éŸ³ç®±æœ€ç‰¹åˆ«çš„地方是，åªè¦å®¹ç§¯ã€é€šæ°”管设计æ£ç¡®ï¼Œå®ƒæœ¬èº«å°±èƒ½äº§ç”Ÿä¸€ç§å¸¦é€šåˆ†é¢‘的效果，让超低音é™å®šåœ¨æŸé¢‘段输出ä¸é”™çš„效率，ä¸è¿‡ç¢äºŽè®¾è®¡å›°éš¾ã€åˆ¶ä½œæˆæœ¬é«˜ï¼Œä½¿ç”¨åœ¨æ±½è½¦éŸ³å“上的比例并ä¸é«˜ï¼
当然，超低音箱还有许多其它的设计模å¼ï¼Œä¾‹å¦‚å·è§’å¼ã€ä¼ 输线å¼â€¦â€¦ä½†å…¶åˆ¶ä½œçš„技术ã€æˆæœ¬è¦æ±‚ç›¸å½“é«˜ï¼Œå› æ¤æžå°‘使用在汽车音å“上，在æ¤ç¬”者也ä¸äºˆèµ˜è¿°ã€‚
音改å°é©¬è™Ž
æµä¼ 于汽车音å“界有关超低音的音å“神è¯ç›¸å½“多，有些å¬èµ·æ¥è¿˜çœŸæ˜¯å…‰æ€ªé™†ç¦»åˆ°æžç‚¹ï¼Œä»¥ä¸‹å°±ä»‹ç»å‡ 个给读者们è¦æƒ•ä¸€ä¸‹ï¼š
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â—超低音的调音心法
å‡å®šæ‚¨è½¦ä¸Šçš„音å“系统具备电å分音设备，或是主机ã€åŠŸæ”¾ä¸Šå†…建å‰çº§åˆ†éŸ³æœºèƒ½(没有这些功能æ怕也很难改装超低音了)，那么在安装了一套车上超低音系统åŽï¼ŒåŠ¿å¿…é¢ä¸´çš„将有三项调音æ¥éª¤ï¼šè¶…低音相ä½ã€è¶…低音与低音的分频衔接和é‡æ„Ÿè®¾å®šã€‚而在这三项调音æ¥éª¤å¼€å§‹ä¹‹å‰ï¼Œæˆ‘们得先设定出车上ä¸ä½ŽéŸ³å–‡å的高通分频点。基本上，ä¸ä½ŽéŸ³å–‡å能够å‘下延伸æ’放出越低频率越好，但由于物ç†å¤©æ€§é™åˆ¶ï¼Œä»¥ä¸€èˆ¬è½¦ç”¨éŸ³å“ä¸ä½ŽéŸ³å–‡å安装在ç»è¿‡éš”音ã€åˆ¶æŒ¯å¤„ç†è¿‡çš„å‰é—¨æ¿ä¸Šä¸ºä¾‹ï¼Œé¢‘率顶多å‘下延伸到60ï¼70Hz，å†ä¸‹åŽ»çš„æžä½Žé¢‘就会开始æ¾æ•£ã€æ¨¡ç³Šï¼Œå› æ¤æˆ‘们抓ä¸ä½ŽéŸ³å–‡å的高通分频点，大约从65ï¼90Hz都å¯ä»¥è®¾å®šï¼Œä»¥èƒ½å¤Ÿæ»¤æŽ‰ä¸ä½ŽéŸ³å–‡å过低的æ¾æ•£é¢‘段为佳。
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2. 超低音分频点设定：在汽车音å“上，超低音低通分频点设定ä¸ä»…牵涉到音ä¹è†å¬çš„å‡è¡¡æ€§ï¼Œæ›´ç‰µæ¶‰åˆ°éŸ³åœºçš„æ£ç¡®æ€§ï¼ä½ 或许å¬è¿‡ï¼Œæœ‰äººè¯´å› 为车上的超低音设备多安装在åŽè¡ŒæŽåŽ¢ä¸ï¼Œæ‰€ä»¥è¶…低音也应该是由车åŽå‘å‰æ‰“过æ¥æ‰å¯¹ã€‚ä¸è¿‡ä»”细想想，有人å¬éŸ³ä¹ä¼šæŠŠéŸ³å“å–‡å放在脑袋åŽé¢å¬çš„å—？这ç»å¯¹ä¸æ˜¯æ£ç¡®çš„音å“概念ï¼å› æ¤ï¼Œå°±ç®—车上超低音设备装在åŽè¡ŒæŽåŽ¢ï¼Œæˆ‘们还是有办法让超低音å¬èµ·æ¥å¥½åƒåœ¨ä¹˜å®¢å‰æ–¹ï¼Œè€Œè¿™å°±å¾—用上一点声å¦çš„ç†è®ºâ€”—声音频率越高，方å‘定ä½æ€§è¶Šå¼ºï¼›é¢‘率越低，声音å¬èµ·æ¥è¶Šæ‰©æ•£ã€è¶Šæ²¡æœ‰æ–¹å‘æ€§ã€‚å› æ¤ä¸€èˆ¬æ¥è¯´ï¼Œå½“我们把超低音的低通分频点设定在55ï¼75Hzä¹‹é—´æ—¶ï¼Œè¿™æ ·ä½Žçš„é¢‘çŽ‡æ˜¯ä¸å¤ªå®¹æ˜“产生方å‘性的问题，也就是在人耳å¬æ¥ï¼Œä¸å¤ªå®¹æ˜“å¬å¾—出超低音是由脑袋åŽæ–¹ä¼ 出，而å†æé…与车上å‰éŸ³åœºä¸ä½ŽéŸ³å–‡åè‰¯å¥½çš„åˆ†é¢‘è¡”æŽ¥ï¼Œä½ å°±ä¼šå¬åˆ°ä»¿è‹¥å‰æ–¹ä¼ æ¥çš„超低音与æ£ç¡®çš„音场定ä½äº†ã€‚
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3. 超低音é‡æ„Ÿè®¾å®šï¼šé‡æ„Ÿè°ƒæ•´æ˜¯è¶…低音系统设定ä¸æœ€ç®€å•ã€å´ä¹Ÿæœ€å®¹æ˜“出错的æ¥éª¤ï¼è®¸å¤šäººæˆ–许喜欢é‡å£å‘³ï¼ŒæŠŠè¶…低音系统的音é‡å¼€å¾—很大æ¥å¢žåŠ 低音，殊ä¸çŸ¥åœ¨ä½ŽéŸ³å¤§å¹…æå‡çš„状æ€ä¸‹ï¼Œè¶…低音频段æžä¸å¥½å·²ç»è¿‡åº¦è€Œå¤±çœŸäº†ï¼Œè¿™æ ·çš„音ä¹æ€Žä¼šå¥½å¬ï¼Ÿå› æ¤ï¼Œæ£ç¡®çš„超低音é‡æ„Ÿè°ƒæ•´ï¼Œå…¶å®žåªè¦è¶…低音å¬èµ·æ¥æœ‰ä¸€ç‚¹ç‚¹æ„Ÿè§‰å°±å¤Ÿäº†ï¼Œä¸»è¦çš„低音还是应该æ¥è‡ªè½¦ä¸Šçš„ä¸ä½ŽéŸ³å–‡å。
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While having a subwoofer, there are often many annoying technical problems. Below, the author will introduce the readers to the operation principle of the subwoofer, the type of subwoofer, and various tuning techniques related to the subwoofer. The positioning of the subwoofer in the car audio system has a clearer understanding!
Why do you have a subwoofer?
Why is there a subwoofer system in the sound of a car? Everyone knows that the frequency of the sound that can be heard by the human ear is about 20Hz to very high frequency of 20,000Hz. Generally, the configuration of the multi-sound car audio speaker, the high-pitched single to cover the 20,000Hz frequency is not a problem. However, if many 5-inch and 6-inch semi-common woofer units are limited by the performance of the horn cone area and the operating stroke, it can be played in the car if it can play 60Hz. Awesome, some of the worse speakers, or the poor installation conditions, the bass alone even has a low frequency sound below 100Hz is difficult!
What if the music below the frequency below 100Hz sounds? The bass is hard and hard, the drum sounds rigid, the strength and the texture of the knocking are lost. The wideness and extension of the whole sound field are limited. The music is like a triangle that is inserted into the ground. The top-heavy has no authority and no stable taste. At the same time, you will not feel that listening to music has a great touch, listening to singing has a warm taste... So, don't underestimate the small frequency range from 20Hz to 100Hz, and lose the music of these two octaves. It sounds not perfect.
In order to make up for the extremely low frequency that the subwoofer can't interpret, we have to add a so-called subwoofer, subwoofer, or ultra-low speaker to the car, so that the music's extremely low frequency domain can also have a perfect performance!
Subwoofer is not equal to bass
Still this topic: Do you need to modify the subwoofer system in the car? For those who are looking to listen to the perfect sound, of course! But if you just want to install a subwoofer in the car, strengthen the bass rhythm, and show off to the world that you have perfect sound quality, then I will advise you to save the money! Because the rhythm in music is called "bass" instead of "subwoofer", instead of spending money on ultra-low speakers to pursue bass, it is better to change a better mid-woofer to enhance the sound insulation and vibration of the speaker installation (for example, before The door), the improved bass effect will be more obvious.
Of course, if you don't care about the balance of sound quality, only the sound pressure of auditory stimulation, the subwoofer can also be used as a tool to push the bass, and this is another fun way to play car audio!
â—Types of ultra low speakers
Looking closely at the products or architecture of the various subwoofers in the car, you will find that they all have a common feature, the "box structure." This is because the energy of the subwoofer wave is very large and the diffusion is strong. If the sound wave of one side of the subwoofer is moved through the box structure, the sound waves on the opposite sides of the cone will interfere with each other. Offset, can not achieve the desired sound effect, so no matter what subwoofer, ultra-low speaker, or popular glass fiber ultra-low speaker, you will find that the speakers are installed in a "box" on!
According to different speaker characteristics and usage requirements, the cabinet structure of the subwoofer has also derived many different shapes and appearances. However, in summary, the types of ultra-low speaker body structures on the car can not escape the closed type, low frequency reflection type, and infinite baffle type. , push-pull, frequency band design:
1. Closed speaker:
Using a closed speaker on a car stereo is the least error-prone and easiest to configure subwoofer mode. As the name implies, when the subwoofer is installed in the speaker, the space of the whole box is isolated from the outside and sealed. Therefore, when the horn cone is pushed outward, according to the atmospheric pressure principle, a reaction of inward suction is also generated in the box. Force, pulling the horn cone intoward; on the contrary, when the horn cone is working inward, the air in the speaker will also push outward. Therefore, the advantage of the closed type speaker is that the air in the speaker is used to pull the movement of the speaker cone, so that the subwoofer can be retracted faster and the sound is cleaner, and the volume of the speaker does not need to be made large to achieve the desired super Bass effect, but the disadvantage is that the amplifier that requires a large output power can effectively drive the speaker.
2. Low frequency reflective speaker:
The low-frequency reflective speaker is simply a closed-type speaker with a vent pipe, so that a part of the air pressure in the box can flow in and out through the vent pipe during the operation of the horn to increase the effect of the extremely low frequency extension. However, the vent pipe of the low-frequency reflective speaker is not randomly opened, and the data such as the diameter, length, and volume of the box must be accurately calculated according to the various performance data of the subwoofer to obtain the desired sound!
3. Infinite Barrier:
Free-Air is a very special subwoofer mode. It does not install the subwoofer in the speaker structure, but uses the luggage compartment space of the vehicle as a speaker. Therefore, the advantage is that it can be saved. Go to the speaker space and let the luggage compartment carry a little more cargo, but the disadvantage is that when the luggage compartment contains items, the change of the entire luggage compartment volume will affect the appearance of the subwoofer! Another important point is that the volume of the luggage compartment of the vehicle often has hundreds of liters. For the normal resonance volume of the subwoofer (about 20-50 liters), it is too big, so the infinite baffle structure is super. The sound quality of the bass system is often unsatisfactory.
4. Push-pull speaker:
This ultra-low speaker was first proposed by the home audio brand Linn. Its design concept is like two electric fans placed close to each other. One fan blows another fan and turns together to generate stronger wind. It is to replace the electric fan with a subwoofer, and one unit pushes the other unit to work synchronously to produce a stronger subwoofer effect, which is the operation principle of the push-pull speaker.
5. Band speaker:
The band speaker is the most difficult to design and manufacture in all the speakers. The box is divided into inner and outer layers. The subwoofer is installed on the inner box that is isolated from the outside, only through the outer box. The vent pipe communicates with the outside of the box. The most special part of the band speaker is that as long as the volume and snorkel are designed correctly, it can produce a bandpass crossover effect, which allows the subwoofer to be limited to a certain frequency output, but it is difficult to design. The cost is high, and the proportion used in car audio is not high!
Of course, there are many other design modes for ultra-low speakers, such as horn and transmission line...but the technology and cost requirements of the production are quite high, so they are rarely used in car audio, so I won't go into details here.
Sound change little sloppy
There are quite a few myths about the subwoofers in the car audio industry. Some of them sound like whims to the extreme. Here are a few tips for the readers:
1. "Want to listen to music and rush and bring strength, it is right to install ultra-low speakers": This argument is really feasible for those who do not pay attention to sound quality, sound field correctness, and only seek sound pressure stimulation, because you As long as the low-pass crossover point of the subwoofer is raised to overlap with the working frequency range of the woofer, the volume of the bass can be greatly increased. However, this extremely inflated bass is definitely not the right sound, and it sounds absolutely impulsive and not good.
2. “Ultra-low speakers can be installed as long as the speaker holes are the same size. Any subwoofer can be installed.†The mechanical characteristics of each subwoofer are different. Suppose a speaker recommends a speaker installation volume of 20 liters and another. It is 40 liters. As a result, both speakers are mounted on the same type of speakers. Do you want them to have the same sound effect? A truly professional approach, you still have to use the original test data set formula of the speaker to calculate the volume of the matching speaker, in order to get the best subwoofer effect.
3. "Two different brands and models of subwoofers can be used on the same speaker." I don't know if this is because the audio store speaker is out of stock or is due to other design considerations. Basically, it is different. The brand and model of the subwoofer have different mechanical characteristics. Therefore, if one speaker moves quickly and the other speaker is like a slow jump, the subwoofer that is launched is not like a ghost fight. pole? Therefore, two different brands and models of speakers are installed on the same speaker, and in most cases, it is not feasible.
4. “Because the subwoofer is installed in the trunk of the car, the sound is coming from behind.†If you meet a car audio store owner and tell you this, you can ask him: Why don’t you have a home store? The sound of the sound does not sound like it came from behind? Basically, as long as the subwoofer system is installed correctly, the phase, crossover, and volume are adjusted properly. The subwoofer you hear should be in the front of the driver's seat and reach a good connection with the bass.
5. “The position of the subwoofer system for the convertible and the two-seat sports car is in the luggage compartmentâ€: We all know that the ideal position for the general car to install the subwoofer system is the rear luggage compartment, but if you encounter a two-seat convertible like the Mercedes SLK Cars, even Porsche, Ferrari, rear-engine sports cars have to change the subwoofer, the installation method is not a rigid board to hardly subwoofer to the luggage compartment! Imagine that there is a thick layer of sheet metal between the luggage compartment of the sports car and the passenger compartment. The subwoofer is placed in the luggage compartment. How can Boeing pass into the passengers? Therefore, in the case of this special case of the sports car to modify the subwoofer system, it is still a special shape of the speaker, installed in the foot position in front of the deputy seat is!
â—Super bass tuning method
Assume that the sound system in your car has an electronic sound distribution device, or a built-in pre-stage crossover function on the main unit and the power amplifier (it is difficult to modify the subwoofer without these functions), then install a set of subwoofers on the car. After the system, there will be three tuning steps: subwoofer phase, subwoofer and bass crossover and volume setting. Before the start of the three tuning steps, we must first set the high-pass crossover point of the woofer in the car. Basically, the mid-woofer can be extended downwards to play the lower the frequency, but due to physical limitations, the woofer in the general car audio is installed on the front door panel that has been sound-proof and vibration-treated. More down to 60-70Hz, the low frequency will continue to be loose and fuzzy, so we grab the woofer's high-pass crossover point, which can be set from about 65-90Hz to filter out the woofer. A loose band that is too low is preferred.
1. Subwoofer phase setting: As long as the subwoofer is working, it will produce a phase problem of the sound. If the basic problem of this subwoofer setting is not adjusted, the sound and subwoofer of the subwoofer system may be formed. The sounds that are played are fighting each other, that is, the more the subwoofer system is set, the less the bass sounds. In actual adjustment, you only need to test from the crossover setting on the electronic crossover or amplifier. When you find that the subwoofer low-pass crossover point is set higher and the volume is louder, the bass in the music will sound more. Less, that is, the phase setting is wrong, you must correct the subwoofer phase by phase adjustment or reverse connection of the subwoofer cable!
2. Subwoofer crossover point setting: In car audio, the subwoofer low-pass crossover point setting not only involves the balance of music listening, but also involves the correctness of the sound field! You may have heard that some people say that because the subwoofer on the car is installed in the rear luggage compartment, the subwoofer should also be driven forward by the car. But think about it, did someone listen to the concert and put the stereo speaker behind the head? This is definitely not the right sound concept! Therefore, even if the subwoofer on the car is installed in the rear luggage compartment, we still have a way to make the subwoofer sound like a passenger in front of it, and this has to use a little acoustic theory - the higher the sound frequency, the stronger the orientation. The lower the frequency, the more diffused and undirected the sound. So in general, when we set the low-pass crossover point of the subwoofer between 55-75Hz, such a low frequency is not easy to produce directionality, that is, it is not heard in the human ear. It's easy to hear that the subwoofer is coming out from behind the head, and with the good crossover of the woofer in the front of the car, you will hear the subwoofer and the correct sound field. .
In addition, the reader should know that even if the low-pass crossover point of the subwoofer is set in the frequency range of 55-75Hz, the musicality will still have different changes. Basically, the lower the crossover point setting, the sound field The more you stretch, the wider the bass, the softer the bass sounds; the higher the crossover point, the stronger the bass impact and the sense of strength. The two characteristics can't be combined. It depends on the listening preferences of the listeners to tune!
3. Subwoofer volume setting: The volume adjustment is the simplest and most error-prone step in the subwoofer system setting! Many people may like to taste heavy, and the volume of the subwoofer system is greatly increased to increase the bass. However, in the state where the bass is greatly increased, the subwoofer band is not excessively distorted. How can such music be heard? Therefore, the correct subwoofer volume adjustment, in fact, as long as the subwoofer sounds a little bit feels enough, the main bass should still come from the mid-woofer on the car.
Please note that the above-mentioned subwoofer tuning method is more inclined to correct sound quality and sound field setting, which is completely different from the sound pressure tuning method!
Subwoofer Confidential File In fact, a car audio system without a subwoofer can also play a sound effect that is sufficient for listening. However, with the subwoofer equipment, you can adjust the sound to bring a wider sound field extension, more soft bass texture, or exaggerate the subwoofer to bring powerful and powerful sound pressure effect... In other words, with the presence of a subwoofer, the fun of playing on the car will be even more fascinating.
While having a subwoofer, there are often many annoying technical problems. Below, the author will introduce the readers to the operation principle of the subwoofer, the type of subwoofer, and various tuning techniques related to the subwoofer. The positioning of the subwoofer in the car audio system has a clearer understanding!
Why do you have a subwoofer?
Why is there a subwoofer system in the sound of a car? Everyone knows that the frequency of the sound that can be heard by the human ear is about 20Hz to very high frequency of 20,000Hz. Generally, the configuration of the multi-sound car audio speaker, the high-pitched single to cover the 20,000Hz frequency is not a problem. However, if many 5-inch and 6-inch semi-common woofer units are limited by the performance of the horn cone area and the operating stroke, it can be played in the car if it can play 60Hz. Awesome, some of the worse speakers, or the poor installation conditions, the bass alone even has a low frequency sound below 100Hz is difficult!
What if the music below the frequency below 100Hz sounds? The bass is hard and hard, the drum sounds rigid, the strength and the texture of the knocking are lost. The wideness and extension of the whole sound field are limited. The music is like a triangle that is inserted into the ground. The top-heavy has no authority and no stable taste. At the same time, you will not feel that listening to music has a great touch, listening to singing has a warm taste... So, don't underestimate the small frequency range from 20Hz to 100Hz, and lose the music of these two octaves. It sounds not perfect.
In order to make up for the extremely low frequency that the subwoofer can't interpret, we have to add a so-called subwoofer, subwoofer, or ultra-low speaker to the car, so that the music's extremely low frequency domain can also have a perfect performance!
Subwoofer is not equal to bass
Still this topic: Do you need to modify the subwoofer system in the car? For those who are looking to listen to the perfect sound, of course! But if you just want to install a subwoofer in the car, strengthen the bass rhythm, and show off to the world that you have perfect sound quality, then I will advise you to save the money! Because the rhythm in music is called "bass" instead of "subwoofer", instead of spending money on ultra-low speakers to pursue bass, it is better to change a better mid-woofer to enhance the sound insulation and vibration of the speaker installation (for example, before The door), the improved bass effect will be more obvious.
Of course, if you don't care about the balance of sound quality, only the sound pressure of auditory stimulation, the subwoofer can also be used as a tool to push the bass, and this is another fun way to play car audio!
â—Types of ultra low speakers
Looking closely at the products or architecture of the various subwoofers in the car, you will find that they all have a common feature, the "box structure." This is because the energy of the subwoofer wave is very large and the diffusion is strong. If the sound wave of one side of the subwoofer is moved through the box structure, the sound waves on the opposite sides of the cone will interfere with each other. Offset, can not achieve the desired sound effect, so no matter what subwoofer, ultra-low speaker, or popular glass fiber ultra-low speaker, you will find that the speakers are installed in a "box" on!
According to different speaker characteristics and usage requirements, the cabinet structure of the subwoofer has also derived many different shapes and appearances. However, in summary, the types of ultra-low speaker body structures on the car can not escape the closed type, low frequency reflection type, and infinite baffle type. , push-pull, frequency band design:
1. Closed speaker:
Using a closed speaker on a car stereo is the least error-prone and easiest to configure subwoofer mode. As the name implies, when the subwoofer is installed in the speaker, the space of the whole box is isolated from the outside and sealed. Therefore, when the horn cone is pushed outward, according to the atmospheric pressure principle, a reaction of inward suction is also generated in the box. Force, pulling the horn cone intoward; on the contrary, when the horn cone is working inward, the air in the speaker will also push outward. Therefore, the advantage of the closed type speaker is that the air in the speaker is used to pull the movement of the speaker cone, so that the subwoofer can be retracted faster and the sound is cleaner, and the volume of the speaker does not need to be made large to achieve the desired super Bass effect, but the disadvantage is that the amplifier that requires a large output power can effectively drive the speaker.
2. Low frequency reflective speaker:
The low-frequency reflective speaker is simply a closed-type speaker with a vent pipe, so that a part of the air pressure in the box can flow in and out through the vent pipe during the operation of the horn to increase the effect of the extremely low frequency extension. However, the vent pipe of the low-frequency reflective speaker is not randomly opened, and the data such as the diameter, length, and volume of the box must be accurately calculated according to the various performance data of the subwoofer to obtain the desired sound!
3. Infinite Barrier:
Free-Air is a very special subwoofer mode. It does not install the subwoofer in the speaker structure, but uses the luggage compartment space of the vehicle as a speaker. Therefore, the advantage is that it can be saved. Go to the speaker space and let the luggage compartment carry a little more cargo, but the disadvantage is that when the luggage compartment contains items, the change of the entire luggage compartment volume will affect the appearance of the subwoofer! Another important point is that the volume of the luggage compartment of the vehicle often has hundreds of liters. For the normal resonance volume of the subwoofer (about 20-50 liters), it is too big, so the infinite baffle structure is super. The sound quality of the bass system is often unsatisfactory.
4. Push-pull speaker:
This ultra-low speaker was first proposed by the home audio brand Linn. Its design concept is like two electric fans placed close to each other. One fan blows another fan and turns together to generate stronger wind. It is to replace the electric fan with a subwoofer, and one unit pushes the other unit to work synchronously to produce a stronger subwoofer effect, which is the operation principle of the push-pull speaker.
5. Band speaker:
The band speaker is the most difficult to design and manufacture in all the speakers. The box is divided into inner and outer layers. The subwoofer is installed on the inner box that is isolated from the outside, only through the outer box. The vent pipe communicates with the outside of the box. The most special part of the band speaker is that as long as the volume and snorkel are designed correctly, it can produce a bandpass crossover effect, which allows the subwoofer to be limited to a certain frequency output, but it is difficult to design. The cost is high, and the proportion used in car audio is not high!
Of course, there are many other design modes for ultra-low speakers, such as horn and transmission line...but the technology and cost requirements of the production are quite high, so they are rarely used in car audio, so I won't go into details here.
Sound change little sloppy
There are quite a few myths about the subwoofers in the car audio industry. Some of them sound like whims to the extreme. Here are a few tips for the readers:
1. "Want to listen to music and rush and bring strength, it is right to install ultra-low speakers": This argument is really feasible for those who do not pay attention to sound quality, sound field correctness, and only seek sound pressure stimulation, because you As long as the low-pass crossover point of the subwoofer is raised to overlap with the working frequency range of the woofer, the volume of the bass can be greatly increased. However, this extremely inflated bass is definitely not the right sound, and it sounds absolutely impulsive and not good.
2. “Ultra-low speakers can be installed as long as the speaker holes are the same size. Any subwoofer can be installed.†The mechanical characteristics of each subwoofer are different. Suppose a speaker recommends a speaker installation volume of 20 liters and another. It is 40 liters. As a result, both speakers are mounted on the same type of speakers. Do you want them to have the same sound effect? A truly professional approach, you still have to use the original test data set formula of the speaker to calculate the volume of the matching speaker, in order to get the best subwoofer effect.
3. "Two different brands and models of subwoofers can be used on the same speaker." I don't know if this is because the audio store speaker is out of stock or is due to other design considerations. Basically, it is different. The brand and model of the subwoofer have different mechanical characteristics. Therefore, if one speaker moves quickly and the other speaker is like a slow jump, the subwoofer that is launched is not like a ghost fight. pole? Therefore, two different brands and models of speakers are installed on the same speaker, and in most cases, it is not feasible.
4. “Because the subwoofer is installed in the trunk of the car, the sound is coming from behind.†If you meet a car audio store owner and tell you this, you can ask him: Why don’t you have a home store? The sound of the sound does not sound like it came from behind? Basically, as long as the subwoofer system is installed correctly, the phase, crossover, and volume are adjusted properly. The subwoofer you hear should be in the front of the driver's seat and reach a good connection with the bass.
5. “The position of the subwoofer system for the convertible and the two-seat sports car is in the luggage compartmentâ€: We all know that the ideal position for the general car to install the subwoofer system is the rear luggage compartment, but if you encounter a two-seat convertible like the Mercedes SLK Cars, even Porsche, Ferrari, rear-engine sports cars have to change the subwoofer, the installation method is not a rigid board to hardly subwoofer to the luggage compartment! Imagine that there is a thick layer of sheet metal between the luggage compartment of the sports car and the passenger compartment. The subwoofer is placed in the luggage compartment. How can Boeing pass into the passengers? Therefore, in the case of this special case of the sports car to modify the subwoofer system, it is still a special shape of the speaker, installed in the foot position in front of the deputy seat is!
â—Super bass tuning method
Assume that the sound system in your car has an electronic sound distribution device, or a built-in pre-stage crossover function on the main unit and the power amplifier (it is difficult to modify the subwoofer without these functions), then install a set of subwoofers on the car. After the system, there will be three tuning steps: subwoofer phase, subwoofer and bass crossover and volume setting. Before the start of the three tuning steps, we must first set the high-pass crossover point of the woofer in the car. Basically, the mid-woofer can be extended downwards to play the lower the frequency, but due to physical limitations, the woofer in the general car audio is installed on the front door panel that has been sound-proof and vibration-treated. More down to 60-70Hz, the low frequency will continue to be loose and fuzzy, so we grab the woofer's high-pass crossover point, which can be set from about 65-90Hz to filter out the woofer. A loose band that is too low is preferred.
1. Subwoofer phase setting: As long as the subwoofer is working, it will produce a phase problem of the sound. If the basic problem of this subwoofer setting is not adjusted, the sound and subwoofer of the subwoofer system may be formed. The sounds that are played are fighting each other, that is, the more the subwoofer system is set, the less the bass sounds. In actual adjustment, you only need to test from the crossover setting on the electronic crossover or amplifier. When you find that the subwoofer low-pass crossover point is set higher and the volume is louder, the bass in the music will sound more. Less, that is, the phase setting is wrong, you must correct the subwoofer phase by phase adjustment or reverse connection of the subwoofer cable!
2. Subwoofer crossover point setting: In car audio, the subwoofer low-pass crossover point setting not only involves the balance of music listening, but also involves the correctness of the sound field! You may have heard that some people say that because the subwoofer on the car is installed in the rear luggage compartment, the subwoofer should also be driven forward by the car. But think about it, did someone listen to the concert and put the stereo speaker behind the head? This is definitely not the right sound concept! Therefore, even if the subwoofer on the car is installed in the rear luggage compartment, we still have a way to make the subwoofer sound like a passenger in front of it, and this has to use a little acoustic theory - the higher the sound frequency, the stronger the orientation. The lower the frequency, the more diffused and undirected the sound. So in general, when we set the low-pass crossover point of the subwoofer between 55-75Hz, such a low frequency is not easy to produce directionality, that is, it is not heard in the human ear. It's easy to hear that the subwoofer is coming out from behind the head, and with the good crossover of the woofer in the front of the car, you will hear the subwoofer and the correct sound field. .
In addition, the reader should know that even if the low-pass crossover point of the subwoofer is set in the frequency range of 55-75Hz, the musicality will still have different changes. Basically, the lower the crossover point setting, the sound field The more you stretch, the wider the bass, the softer the bass sounds; the higher the crossover point, the stronger the bass impact and the sense of strength. The two characteristics can't be combined. It depends on the listening preferences of the listeners to tune!
3. Subwoofer volume setting: The volume adjustment is the simplest and most error-prone step in the subwoofer system setting! Many people may like to taste heavy, and the volume of the subwoofer system is greatly increased to increase the bass. However, in the state where the bass is greatly increased, the subwoofer band is not excessively distorted. How can such music be heard? Therefore, the correct subwoofer volume adjustment, in fact, as long as the subwoofer sounds a little bit feels enough, the main bass should still come from the mid-woofer on the car.
Please note that the above-mentioned subwoofer tuning method is more inclined to correct sound quality and sound field setting, which is completely different from the sound pressure tuning method!
Subwoofer Confidential File In fact, a car audio system without a subwoofer can also play a sound effect that is sufficient for listening. However, with the subwoofer equipment, you can adjust the sound to bring a wider sound field extension, more soft bass texture, or exaggerate the subwoofer to bring powerful and powerful sound pressure effect... In other words, with the presence of a subwoofer, the fun of playing on the car will be even more fascinating.
While having a subwoofer, there are often many annoying technical problems. Below, the author will introduce the readers to the operation principle of the subwoofer, the type of subwoofer, and various tuning techniques related to the subwoofer. The positioning of the subwoofer in the car audio system has a clearer understanding!
Why do you have a subwoofer?
Why is there a subwoofer system in the sound of a car? Everyone knows that the frequency of the sound that can be heard by the human ear is about 20Hz to very high frequency of 20,000Hz. Generally, the configuration of the multi-sound car audio speaker, the high-pitched single to cover the 20,000Hz frequency is not a problem. However, if many 5-inch and 6-inch semi-common woofer units are limited by the performance of the horn cone area and the operating stroke, it can be played in the car if it can play 60Hz. Awesome, some of the worse speakers, or the poor installation conditions, the bass alone even has a low frequency sound below 100Hz is difficult!
What if the music below the frequency below 100Hz sounds? The bass is hard and hard, the drum sounds rigid, the strength and the texture of the knocking are lost. The wideness and extension of the whole sound field are limited. The music is like a triangle that is inserted into the ground. The top-heavy has no authority and no stable taste. At the same time, you will not feel that listening to music has a great touch, listening to singing has a warm taste... So, don't underestimate the small frequency range from 20Hz to 100Hz, and lose the music of these two octaves. It sounds not perfect.
In order to make up for the extremely low frequency that the subwoofer can't interpret, we have to add a so-called subwoofer, subwoofer, or ultra-low speaker to the car, so that the music's extremely low frequency domain can also have a perfect performance!
Subwoofer is not equal to bass
Still this topic: Do you need to modify the subwoofer system in the car? For those who are looking to listen to the perfect sound, of course! But if you just want to install a subwoofer in the car, strengthen the bass rhythm, and show off to the world that you have perfect sound quality, then I will advise you to save the money! Because the rhythm in music is called "bass" instead of "subwoofer", instead of spending money on ultra-low speakers to pursue bass, it is better to change a better mid-woofer to enhance the sound insulation and vibration of the speaker installation (for example, before The door), the improved bass effect will be more obvious.
Of course, if you don't care about the balance of sound quality, only the sound pressure of auditory stimulation, the subwoofer can also be used as a tool to push the bass, and this is another fun way to play car audio!
â—Types of ultra low speakers
Looking closely at the products or architecture of the various subwoofers in the car, you will find that they all have a common feature, the "box structure." This is because the energy of the subwoofer wave is very large and the diffusion is strong. If the sound wave of one side of the subwoofer is moved through the box structure, the sound waves on the opposite sides of the cone will interfere with each other. Offset, can not achieve the desired sound effect, so no matter what subwoofer, ultra-low speaker, or popular glass fiber ultra-low speaker, you will find that the speakers are installed in a "box" on!
According to different speaker characteristics and usage requirements, the cabinet structure of the subwoofer has also derived many different shapes and appearances. However, in summary, the types of ultra-low speaker body structures on the car can not escape the closed type, low frequency reflection type, and infinite baffle type. , push-pull, frequency band design:
1. Closed speaker:
Using a closed speaker on a car stereo is the least error-prone and easiest to configure subwoofer mode. As the name implies, when the subwoofer is installed in the speaker, the space of the whole box is isolated from the outside and sealed. Therefore, when the horn cone is pushed outward, according to the atmospheric pressure principle, a reaction of inward suction is also generated in the box. Force, pulling the horn cone intoward; on the contrary, when the horn cone is working inward, the air in the speaker will also push outward. Therefore, the advantage of the closed type speaker is that the air in the speaker is used to pull the movement of the speaker cone, so that the subwoofer can be retracted faster and the sound is cleaner, and the volume of the speaker does not need to be made large to achieve the desired super Bass effect, but the disadvantage is that the amplifier that requires a large output power can effectively drive the speaker.
2. Low frequency reflective speaker:
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5. 频段å¼éŸ³ç®±ï¼š
频段å¼éŸ³ç®±æ˜¯æ‰€æœ‰éŸ³ç®±ä¸æœ€éš¾è®¾è®¡ä¸Žåˆ¶ä½œçš„一ç§ï¼Œå…¶ç®±ä½“分为内ã€å¤–两层，超低音喇å安装在与外界隔ç»çš„内层箱体上，åªé€è¿‡å¤–层箱体上的通气管与箱外相通。频段å¼éŸ³ç®±æœ€ç‰¹åˆ«çš„地方是，åªè¦å®¹ç§¯ã€é€šæ°”管设计æ£ç¡®ï¼Œå®ƒæœ¬èº«å°±èƒ½äº§ç”Ÿä¸€ç§å¸¦é€šåˆ†é¢‘的效果，让超低音é™å®šåœ¨æŸé¢‘段输出ä¸é”™çš„效率，ä¸è¿‡ç¢äºŽè®¾è®¡å›°éš¾ã€åˆ¶ä½œæˆæœ¬é«˜ï¼Œä½¿ç”¨åœ¨æ±½è½¦éŸ³å“上的比例并ä¸é«˜ï¼
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1.“想è¦éŸ³ä¹å¬èµ·æ¥åˆå†²åˆå¸¦åŠ²ï¼ŒåŠ 装超低音箱就对了â€ï¼šè¿™ä¸ªè®ºç‚¹å¯¹äºŽä¸è®²ç©¶éŸ³è´¨ã€éŸ³åœºæ£ç¡®æ€§ï¼Œè€Œåªè¿½æ±‚声压刺激的人æ¥è¯´ç¡®å®žå¯è¡Œï¼Œå› ä¸ºä½ åªè¦æŠŠè¶…低音喇å的低通分频点拉高到与低音喇å工作频域é‡å ï¼Œå°±èƒ½å¤§å¹…å¢žåŠ ä½ŽéŸ³çš„é‡æ„Ÿã€‚ä¸è¿‡è¿™ç§æžåº¦è†¨èƒ€çš„低音ç»å¯¹ä¸æ˜¯æ£ç¡®çš„声音，å¬èµ·æ¥ä¹Ÿç»å¯¹åªæœ‰å†²åŠ²è€Œä¸ä¼šå¥½å¬ã€‚
2.“超低音箱åªè¦å–‡åå”ä½å°ºå¯¸ç›¸åˆï¼Œä»»ä½•è¶…低音喇å都å¯ä»¥å®‰è£…â€ï¼šæ¯ç§è¶…低音喇å的机械特性都ä¸ç›¸åŒï¼Œå‡è®¾ä¸€æ¬¾å–‡å建议的音箱安装容积是20å…¬å‡ã€å¦ä¸€æ¬¾æ˜¯40å…¬å‡ï¼Œç»“果这两颗喇å都安装在åŒæ ·æ¬¾å¼çš„éŸ³ç®±ä¸Šï¼Œä½ æƒ³å®ƒä»¬çš„å£°éŸ³æ•ˆæžœä¼šä¸€æ ·å—？真æ£ä¸“业的åšæ³•ï¼Œè¿˜æ˜¯å¾—利用喇å的原厂测试数æ®å¥—å…¬å¼è®¡ç®—，é‡èº«æ‰“é€ å®¹ç§¯ç›¸ç¬¦çš„éŸ³ç®±ï¼Œæ‰èƒ½å¾—到最佳的超低音效果。
3.“两颗ä¸åŒå“牌ã€åž‹å·çš„超低音喇å安装在åŒä¸€éŸ³ç®±ä¸Šä¹Ÿå¯ä½¿ç”¨â€ï¼šæˆ‘ä¸çŸ¥é“è¿™ç§æƒ…å†µæ˜¯å› ä¸ºéŸ³å“店喇å缺货还是出于其它设计考虑æ‰å‘生，基本上åªè¦æ˜¯ä¸åŒå“牌ã€åž‹å·çš„超低音喇å，其机械特性都有所ä¸åŒï¼Œå› æ¤å‡ä½¿ä¸€é¢—å–‡å快速è¿åŠ¨æ—¶ã€å¦ä¸€é¢—å–‡åå´åƒåœ¨è·³æ…¢ä¸‰ï¼Œè¿™æ ·æŽ¨å‡ºçš„超低音ä¸å°±åƒé¬¼æ‰“æž¶ä¸€æ ·ï¼Œéš¾å¬åˆ°æžç‚¹ï¼Ÿå› æ¤ï¼Œä¸¤é¢—ä¸åŒå“牌ã€åž‹å·çš„å–‡å安装在åŒä¸€éŸ³ç®±ä¸Šï¼Œç»å¤§éƒ¨åˆ†æƒ…况下都是行ä¸é€šçš„设计。
4.â€œå› ä¸ºè¶…ä½ŽéŸ³ç®±å®‰è£…åœ¨è½¦åŽè¡ŒæŽåŽ¢ï¼Œæ‰€ä»¥å£°éŸ³æ˜¯ç”±åŽé¢ä¼ æ¥çš„â€ï¼šå¦‚æžœä½ é‡åˆ°ä¸€é—´æ±½è½¦éŸ³å“店è€æ¿è¿™æ ·è·Ÿä½ è¯´ï¼Œä½ å¯ä»¥å问他：为什么别家音å“店装出的音å“声音å¬èµ·æ¥å°±ä¸åƒæ˜¯ä»ŽåŽé¢ä¼ æ¥ï¼ŸåŸºæœ¬ä¸Šï¼Œåªè¦è¶…低音系统的安装æ£ç¡®ï¼Œç›¸ä½ã€åˆ†é¢‘点ã€é‡æ„Ÿè°ƒæ•´å¾—å®œï¼Œä½ å¬åˆ°çš„超低音场应该是在驾驶座å‰æ–¹è„šéƒ¨ä½ç½®ï¼Œå¹¶ä¸”与低音达æˆè‰¯å¥½çš„衔接。
5.“敞篷车ã€åŒåº§è·‘车安装超低音系统的ä½ç½®æ˜¯åœ¨è¡ŒæŽåŽ¢â€ï¼šæˆ‘们都知é“一般轿车安装超低音系统的ç†æƒ³ä½ç½®æ˜¯åŽè¡ŒæŽåŽ¢ï¼Œä½†è¦æ˜¯é‡åˆ°åƒå¥”é©°SLKè¿™æ ·çš„åŒåº§æ•žç¯·è½¦ï¼Œç”šè‡³ä¿æ—¶æ·ã€æ³•æ‹‰åˆ©è¿™æ ·çš„åŽç½®å‘动机跑车è¦æ”¹è¶…低音，那装法å¯å°±ä¸æ˜¯æ»æ¿æ¿åœ°ç¡¬æŠŠè¶…低音往行æŽåŽ¢å¡žå’¯ï¼è¯•æƒ³è¿™äº›è·‘车的行æŽåŽ¢ä¸Žä¹˜å®¢å®¤é—´éƒ½æœ‰ä¸€å±‚厚厚的钣金隔开超低音装在行æŽåŽ¢ä¸ï¼Œæ³¢éŸ³æ€Žä¹ˆå¯èƒ½ä¼ 进乘客事ä¸ã€‚å› æ¤é‡åˆ°è¿™ç§è·‘车è¦æ”¹è£…超低音系统的特殊案例的方法还是åšä¸ªç‰¹æ®Šå½¢çŠ¶çš„音箱，安装在副手座å‰æ–¹çš„è„šè¸ä½ç½®æ‰æ˜¯ï¼
â—超低音的调音心法
å‡å®šæ‚¨è½¦ä¸Šçš„音å“系统具备电å分音设备，或是主机ã€åŠŸæ”¾ä¸Šå†…建å‰çº§åˆ†éŸ³æœºèƒ½(没有这些功能æ怕也很难改装超低音了)，那么在安装了一套车上超低音系统åŽï¼ŒåŠ¿å¿…é¢ä¸´çš„将有三项调音æ¥éª¤ï¼šè¶…低音相ä½ã€è¶…低音与低音的分频衔接和é‡æ„Ÿè®¾å®šã€‚而在这三项调音æ¥éª¤å¼€å§‹ä¹‹å‰ï¼Œæˆ‘们得先设定出车上ä¸ä½ŽéŸ³å–‡å的高通分频点。基本上，ä¸ä½ŽéŸ³å–‡å能够å‘下延伸æ’放出越低频率越好，但由于物ç†å¤©æ€§é™åˆ¶ï¼Œä»¥ä¸€èˆ¬è½¦ç”¨éŸ³å“ä¸ä½ŽéŸ³å–‡å安装在ç»è¿‡éš”音ã€åˆ¶æŒ¯å¤„ç†è¿‡çš„å‰é—¨æ¿ä¸Šä¸ºä¾‹ï¼Œé¢‘率顶多å‘下延伸到60ï¼70Hz，å†ä¸‹åŽ»çš„æžä½Žé¢‘就会开始æ¾æ•£ã€æ¨¡ç³Šï¼Œå› æ¤æˆ‘们抓ä¸ä½ŽéŸ³å–‡å的高通分频点，大约从65ï¼90Hz都å¯ä»¥è®¾å®šï¼Œä»¥èƒ½å¤Ÿæ»¤æŽ‰ä¸ä½ŽéŸ³å–‡å过低的æ¾æ•£é¢‘段为佳。
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2. 超低音分频点设定：在汽车音å“上，超低音低通分频点设定ä¸ä»…牵涉到音ä¹è†å¬çš„å‡è¡¡æ€§ï¼Œæ›´ç‰µæ¶‰åˆ°éŸ³åœºçš„æ£ç¡®æ€§ï¼ä½ 或许å¬è¿‡ï¼Œæœ‰äººè¯´å› 为车上的超低音设备多安装在åŽè¡ŒæŽåŽ¢ä¸ï¼Œæ‰€ä»¥è¶…低音也应该是由车åŽå‘å‰æ‰“过æ¥æ‰å¯¹ã€‚ä¸è¿‡ä»”细想想，有人å¬éŸ³ä¹ä¼šæŠŠéŸ³å“å–‡å放在脑袋åŽé¢å¬çš„å—？这ç»å¯¹ä¸æ˜¯æ£ç¡®çš„音å“概念ï¼å› æ¤ï¼Œå°±ç®—车上超低音设备装在åŽè¡ŒæŽåŽ¢ï¼Œæˆ‘们还是有办法让超低音å¬èµ·æ¥å¥½åƒåœ¨ä¹˜å®¢å‰æ–¹ï¼Œè€Œè¿™å°±å¾—用上一点声å¦çš„ç†è®ºâ€”—声音频率越高，方å‘定ä½æ€§è¶Šå¼ºï¼›é¢‘率越低，声音å¬èµ·æ¥è¶Šæ‰©æ•£ã€è¶Šæ²¡æœ‰æ–¹å‘æ€§ã€‚å› æ¤ä¸€èˆ¬æ¥è¯´ï¼Œå½“我们把超低音的低通分频点设定在55ï¼75Hzä¹‹é—´æ—¶ï¼Œè¿™æ ·ä½Žçš„é¢‘çŽ‡æ˜¯ä¸å¤ªå®¹æ˜“产生方å‘性的问题，也就是在人耳å¬æ¥ï¼Œä¸å¤ªå®¹æ˜“å¬å¾—出超低音是由脑袋åŽæ–¹ä¼ 出，而å†æé…与车上å‰éŸ³åœºä¸ä½ŽéŸ³å–‡åè‰¯å¥½çš„åˆ†é¢‘è¡”æŽ¥ï¼Œä½ å°±ä¼šå¬åˆ°ä»¿è‹¥å‰æ–¹ä¼ æ¥çš„超低音与æ£ç¡®çš„音场定ä½äº†ã€‚
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