| 摘要 |
PCT No. PCT/AU84/00033 Sec. 371 Date Nov. 2, 1984 Sec. 102(e) Date Nov. 2, 1984 PCT Filed Mar. 2, 1984 PCT Pub. No. WO84/03600 PCT Pub. Date Sep. 13, 1984.A pressure modifying device and method which utilizes a gas or vapor and an adsorbent material to reduce the amplitude of pressure variations in gas or vapor. 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.
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