Patent ID: 6324292
Filing Date: 2001-11-27
Classification: H04R

Abstract:
A speaker apparatus comprising:a speaker unit;a cabinet for forming a first internal space on the rear side of said speaker unit with a plurality of wall surfaces including a baffle plate for use in mounting said speaker unit;an acoustic tube for forming a second internal space, said acoustic tube being formed along at least one wall surface out of said plurality of wall surfaces and having a substantially uniform hollow section and an opening at one end; andan acoustical material for separating said first internal space from said second internal space by closing said opening of said acoustic tube;wherein said acoustic tube has a tube length about 1/(2n) (n=positive integer) times as large as a wavelength corresponding to a lowest resonance mode of a standing wave produced along said one wall surface out of said standing waves produced in said first internal space and that said opening is disposed close to a node of said standing wave.