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 which potentially make it less prone to feedback. Initial experiments are reported which show a 4dB improvement in feedback margin without electronic assistance, gains comparable with most other current signal processing techniques.
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