AES Paris 2016
Professional Sound Expo Session
Monday, June 6, 11:00 — 11:45 (PSE Stage)
Active Velocity Acoustic Absorption for Low Frequencies
Presenter:Roger Roschnik, PSI Audio - Yverdon-les-Bains, Switzerland
Abstract:
In recording and listening rooms, low-frequency modal resonances lead to uneven distributions in space and frequency of the acoustic energy, as well as an alteration of the temporal behavior of the original music content. Passive low frequency absorption has critical limitations in terms of volume and/or bandwidth. Other solutions exist to mitigate some of the effects of low-frequency modal resonance but all have other disadvantages associated. This presentation will discuss active velocity acoustic absorption, said to be extremely effective in absorbing low frequencies by modifying the acoustic impedance of air surrounding it. It also has many other advantages such as being effective over a large bandwidth of frequencies, working independently from the sound source, requiring no settings, can be turn on and off and moved from room to room, etc. We will explain how active absorption works and discuss its limitations as well as its advantages.
