One of the problems with most studio control rooms or small home studios is that fact that there are problems in the low end response. We try to control these with bass traps, but to be effective, normal passive traps take up a lot of precious room. There is an alternative however, and that’s to use a new breed of low frequency absorption that’s active, and that’s exactly what the PSI Audio AVAA C20 Active Bass Absorber does.
The AVAA C20 works on frequencies from 15Hz to 150Hz and it’s dead easy to set up in that there are no settings or calibration, only an on/off switch. So how does it work?
When audio sound waves hit a wall they build up pressure, which makes them bounce back into the room, reinforcing some frequencies and attenuating others, which creates an uneven frequency response. A normal passive bass trap takes that pressure wave and turns it into heat with material like fiberglass or rockwool, but you need a lot of it to be effective, especially at lower frequencies. The AVAA C20 has a microphone that measures the pressure of the sound wave. An acoustic membrane then is driven to absorb the volume of air going through the acoustic resistance of the front panel of the unit, turning the pressure of the sound wave to zero so it doesn’t bounce back into the room.
The interesting thing is that the AVAA C20 is totally analog and there’s no DSP involved. No, it’s doesn’t make a sound either, but it does the job of a bass trap up to 20 times as large as the unit!
The PSI Audio AVAA C20 is not a small investment at $2000 each, and you’ll need 2 for a 400 square foot room (one for each corner). Unlike physical passive traps though, these are easily portable, so you’re buying something that you can use in any environment for a long time. Check out the video below or go to the website for more info.