Acoustic feedback stability is a fundamental limitation of all public address, sound reinforcement, and duplex teleconferencing systems. Over the past 30 years, a number of techniques have been developed to help improve the gain before feedback margin. This paper reviews progress to date and demonstrates that a new class of loudspeaker, the distributed mode loudspeaker, inherently possesses a number of characteristics that potentially make it less prone to feedback. Initial experiments are reported that show a 4-dB improvement in feedback margin without electronic assistance, which are gains comparable with most other current signal processing techniques.

Authors: Mapp, Peter; Ellis, Christien
Affiliations: Peter Mapp Associates, Colchester, Essex, UK ; New Transducers Limited, Huntingdon, UK(See document for exact affiliation information.)
AES Convention: 105 (September 1998) Paper Number: 4850
Publication Date: September 1, 1998
Session Subject: Sound Reinforcement; Room Acoustics

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