How to adjust the home theater subwoofer to produce a shocking effect ?

                      How to adjust the home theater subwoofer to produce a shocking effect ?

1. Crossover point

The place to adjust is the subwoofer's low-pass filter, which depends on the type of main speakers. If your main speaker is huge and you only need to let the lowest frequency part of the signal pass through the subwoofer, you can set the frequency split point between 60Hz and 80Hz; if your main speaker is medium in volume, then low-pass filter The crossover point can be set slightly higher, for example, between 80Hz and 100Hz; if your main speaker is small, it is best to set the crossover point as high as possible (usually 120Hz to 150Hz).

2. Volume

The law of different frequency bands affecting the loudness of the human ear:

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 area is the hearing sensitive area of the human ear. Therefore, when mixing, increasing the sound level in this frequency band will significantly increase the overall loudness.

3) In the frequency band of f<1000 HZ, the hearing sensitivity decreases. That is to say, to achieve the mid-low frequency sound with the same loudness as 1000 HZ, there must be a greater sound pressure level.

4) In the low-frequency region of f<100HZ, if the sound pressure level increases a little, the low-frequency loudness will immediately increase obviously, but if it is slightly reduced, the bass will be inaudible immediately.

5) In the high-frequency region of f>5kHZ, the changes of sound pressure level and loudness are basically consistent. However, when the sound frequency exceeds 7kHZ, the sensitivity will decrease to a certain extent.

It is worth noting that the subwoofer must not be turned on too much, even when watching a large movie, it must be turned on to a moderate volume, and must not exceed 2/3 of the total volume. Don't make too much volume when listening to music, as this will cause serious distortion of your listening effect.

3. Phase

Sound, as a form of vibration wave, is of course periodic, so there is a concept of phase. The purpose of subwoofer phase adjustment is to have the same phase as the main speaker, so that the sound will not cancel out, and a more harmonious sound will be produced. Now, the overall sound effect of the main speaker/subwoofer is more balanced. Experimentation will immediately show whether there is an improvement: you may hear more or less low frequencies at a certain phase.

Changing the phase can have a positive and negative effect on how you hear the acoustics of the listening room, so that the sound you hear at the listening position will also be different.

As mentioned earlier, you sit in different positions in the listening area and ask your assistant to adjust the phase of a subwoofer, and try again and again until you get the best sound effect. Of course, if the ear alone is not accurate enough, just use a sound pressure tester, use some software to make the main speaker and subwoofer sound at the same time, and then adjust the phase (some guns can only adjust a few options) , some like Teufel S10000sw can be adjusted arbitrarily from 0 to 180), to get a relatively large sound pressure at the listening position is to get a relatively correct phase.