What is it and what does it do? I have a pretty good idea of what it does, I just wanna be sure. TIA

 

subsonic filter is what filters out a speed less than what sound travels at in air.

Now what you're looking for is the term infrasonic filter, which filters frequencies that below the audible range.

 

Well, I did a lilttle research while at work, and found that they're both basically the same thing. A subsonic filter on an amplifier works more like a LPF. Most filter at 15Hz and below to make sure energy is not wasted in reproducing frequencies not heard by the human ear. An infrasonic filter on the other hand works more like a HPF, usually filtering frequencies between 15-60Hz.


Modified by DJtal Chaos at 12:48 PM 4/8/2004

 

actually, they do the same thing (assuming they really meant infrasonic instead of subsonic). THey are basically high pass filters at low frequency. The frequency they attenuate at is a different story. Manufactors can put the frequency as a fixed one, or variable. But it surves one purpose, to attenuate frequencies below what they are set to. Think of it as a HPF at low freq.

a "subsonic" filter on an amp does not work like a LPF. If so, then we would only be letting the sub play frequency below ~30hz or lower or whatever of that nature.