Meyer Sound Laboratories, Incorporated

Jean Pierre Mamin

John D Meyer

Pablo Espinosa

Peter Kowalczyk

A loudspeaker is provided that passively achieves a directional polar response at low frequencies with a high degree of attenuation between the front and the back of the loudspeaker. The loudspeakerhas a transducer, an enclosurebehind the transducer, and port openingsin the sidewallsof the enclosure to allow a back-wave produced by the transducer to exit the enclosure and combine with the front wave produced by the transducer. Cancellation behind the loudspeaker at low frequencies is achieved by delaying the back wave with low loss. Low loss delay at low frequencies is achieved by inserting a low-density fibrous fill materialin the acoustic chamberformed behind the transducerby the enclosure. A fibrous material is selected having a low-pass transfer function and low acoustic loss in its low-frequency pass band.

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La Tour de Peilz, Switzerland

Jean Pierre Mamin