PURPOSE:To obtain a bass reproducing characteristic, by constituting so that a position of a bass-reflex duct is variable. CONSTITUTION:A bass-reflex duct fitting plate 4a is constituted so that a bass- reflex duct can be fitted so as to be positioned at the lower part of a cabinet, or can be fitted so as to be positioned at the upper part of the cabinet. When an sound pressure frequency characteristic 2a in case when the bass-reflex duct is fitted to the lower part of the cabinet is compared with an sound pressure frequency characteristic 2b in case when it is fitted to the upper part, the sound pressure frequency characteristic in the vicinity of 50Hz is emphasized in case when the bass-reflex duct is fitted to the lower part of the cabinet and the cabinet is placed on the floor of a room.
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