Patent ID: 11871179
Assignee: nan
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. An apparatus comprising:
A dual chamber reflex loudspeaker enclosure, wherein said enclosure comprises one or more low-frequency loudspeaker(s) and two chambers separated by a partition,
wherein the first said chamber comprises said loudspeaker(s) that bound(s) and interact(s) with the air inside said first chamber,
wherein the internal air volume of said first chamber is twice that of said second chamber,
wherein said second said chamber comprises no loudspeaker that interacts with the air inside said second chamber,
wherein said partition comprises one or more bass reflex port(s) that connects the air inside said chambers,
wherein each said chamber further comprises one or more bass reflex port(s) that connects the air inside each said chamber directly to free air unbound by said enclosure,
wherein said ports are sized to produce more than one bass reflex tuning frequency,
wherein said tuning frequencies include a fundamental tuning frequency that is more than ½ octave below the loudspeaker resonance frequency,
wherein said tuning frequencies also include a second tuning frequency that approximates or equals an octave overtone of said fundamental frequency.