Constant pressure device

Details Constant pressure device Constant pressure device

G - Physics

11

B

181/60

G11B 21/16 (2006.01)

Patent

CA 1246464

ABSTRACT CONSTANT PRESSURE DEVICE A pressure modifying device and method which utilizes a gas or vapour and an adsorbent material to reduce the amplitude of pressure variations in gas or vapour. The technique is applicable to loudspeaker assemblies having a box (2), low frequency loudspeaker (16) and a mass (20) of activated charcoal in the box. Excursions of the cone (18) of the loudspeaker in the range 20 to 100 Hz cause pressure fluctuations in the air in the box but the size of those pressure fluctuations is comparatively small owing to increased air adsorption on the activated charcoal leading to increased efficiency.

491929

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