The subwoofer usually has some basic control adjustment parameters that need to be adjusted, mainly including crossover point, volume, phase, and so on.
1, crossover point
The place to be adjusted is the low-pass filter of the subwoofer. The adjustment is based on the type of main speaker. If your main speaker is huge, just let the lowest frequency part of the signal behave through the subwoofer, you can set the frequency split point between 60Hz and 80Hz; if your main speaker is medium in size, then low pass filtering The split point can be set slightly higher, for example between 80Hz and 100Hz; if your main speaker is a small point, then it is best to set the crossover point as high as possible (usually 120Hz to 150Hz).
2. The law of different frequency segments affecting the human ear perception loudness:
1) At the point where the frequency value f = 1000 HZ, the loudness value is equal to the value of the corresponding sound pressure level.
2) At 3000 HZ, this frequency region is the auditory sensitive area of ​​the human ear. Therefore, when mixing, increasing the sound level in this band, the overall loudness will increase significantly.
3) In the frequency range of f < 1000 HZ, the hearing sensitivity decreases. This means that to achieve a mid-low frequency sound with the same loudness as 1000 HZ, there must be a greater sound pressure level.
4) In the low frequency range of f<100HZ, the sound pressure level is slightly increased, and the low frequency loudness will increase obviously immediately, but if it is slightly reduced, the bass will be heard immediately.
5) In the high frequency region of f>5kHZ, the changes of sound pressure level and loudness are basically the same. However, when the sound frequency exceeds 7kHZ, the sensitivity will decrease to some extent.
It is worth noting that the subwoofer should not be able to open too much, even when watching large movies, it should be opened to a moderate volume, and should never exceed 2/3 of the total volume. Listening to music can't make too much volume, which can cause serious distortion in your listening experience.
3, phase
As a form of vibration wave, sound is of course periodic, so there is a concept of phase. The purpose of phase adjustment of the subwoofer is to have the same phase as the main speaker, so that sound cancellation will produce a more harmonious sound. Come, the integrated sound of the main speaker/subwoofer is more balanced. The test immediately shows if there is an improvement: you may hear more or less low frequencies on one phase.
Changing the phase will have both positive and negative effects on the acoustics of the listening room, so that the sound you hear at the listening position will be different.
As you said before, listen to the different parts of the listening area, let your assistant adjust the phase of a subwoofer and listen to it until you get the best sound. Of course, if the ear is not accurate enough, just use a sound pressure tester. With some software, the main speaker and the subwoofer will sound at the same time, and then adjust the phase (some guns can only adjust several options). Some like the Teufel S10000sw can be adjusted from 0 to 180). Obtaining a relatively large sound pressure at the viewing position is to get the correct phase.
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