PSI Audio AVAA Demystified - Chapter 2 - How it works 

PSI Audio AVAA is a revolutionary active bass trap that absorbs room modes between 15Hz and 150Hz. It is small and movable and can easily be placed in any kind of room. The AVAA’s efficiency is way higher than passive material, and it doesn't over dampen frequencies above 150Hz. An extremely effective solution and a must have for rooms with serious low-end issues.
And don't forget:
it is full ANALOG, there is no DSP inside!
it doesn't emit any sound, it is not a noise cancelling device!

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