AES Show: Make the Right Connections Audio Engineering Society

AES San Francisco 2008
Tutorial T12

Saturday, October 4, 2:30 pm — 4:30 pm

T12 - Damping of the Room Low-Frequency Acoustics (Passive and Active)

Reza Kashani, University of Dayton - Dayton, OH, USA
Jim Wischmeyer, Modular Sound Systems, Inc. - Lake Barrington, IL, USA

As the result of its size and geometry, a room excessively amplifies sound at certain frequencies. This is the result of standing waves (acoustic resonances/modes) of the room. These are waves whose original oscillation is continuously reinforced by their own reflections. Rooms have many resonances, but only the low-frequency ones are discrete, distinct, unaffected by the sound absorbing material in the room, and accommodate most of the acoustic energy build-up in the room.