| 摘要 |
PROBLEM TO BE SOLVED: To reduce the area of baffle surface in a bass reflex type speaker unit constituted by fixing at least two speakers 3 and 5 having different range to a cabinet 1 where the inner space of the cabinet 1 is opened to the outside through two resonance paths of different length. SOLUTION: In the speaker unit, a double duct 4 comprising inner and outer tubular bodies is disposed in the cabinet 1. The double duct 4 is constituted by connecting a paper tube 45 with an integrally molded member 41 wherein a long resonance path is formed by the inner tube part 43 of the integrally molded member 41 and the paper tube 45 and a short resonance path is formed between the inner tube part 43 and the outer tubular part 42 of the integrally molded member 41.
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