| 摘要 |
PURPOSE:To change optionally the low band characteristic of a speaker by replacing an enclosure member and to connect smoothly a low-intermediate band unit with F-characteristic by attaching the said member which has an enough rigidity to endure the pressure variation during the speaker operation freely attachably and detachably to form the rear chamber of the diaphragm. CONSTITUTION:In the space between a frame 1' and a cone (diaphragm) 7, the enclosure member 12 is attached to the frame 1', to form the enclosed chamber 11' in the rear of the diaphragm with the cone 7 jointly. The member 12 is made of a resin or a metal having the enough rigidity to endure the pressure(internal pressure)-variation during the operation of the speaker, and is formed in a flat circular shape, a square shape, or elliptical shape depending on the shape of the speaker. By means of the rear chamber formed by the member 12 which is replaceable connected to the frame 1', the low-band characteristic of the speaker can be optionally changed.
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