Pues nunca había visto nada igual (y no es exactamente nuevo, por lo menos un par de años ya tiene).
AVAA stands for Active Velocity Acoustic Absorber. The principle on which the AVAA C20 works is to convert an incoming pressure wave into a velocity wave and thus, effectively, absorb it. PSI calls the AVAA an anti-wall, and says it provides an absorbent volume 5 to 20 times its own size, depending on the wavelength encountered. To work its magic, the AVAA uses pure analog technology: a complex combination of a microphone, perforated membrane, velocity transducer, and amplifier with feedforward and feedback. Unlike its competitor, the active E-Trap from Bag End Loudspeakers (footnote 2), the AVAA doesn't need to be tuned, and will affect bass frequencies from 15 to 150Hz in proportion to their sound pressure level (SPL). It requires no adjustments other than proper placement.
https://www.stereophile.com/content/...onic-bass-trap



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