| 摘要 |
The present invention enables the output sound of a speaker unit to be outputted as a surface sound source in a limited space. A three-dimensional cubic knitted fabric (43) is provided, with tension applied thereto in the surface direction, at a position where speaker units (31, 32) almost face each other. Because the tension is applied, a pair of ground knitted fabrics constituting the three-dimensional cubic knitted fabric (43) and a connecting strand reciprocating between the ground knitted fabrics vibrate due to the elastic action thereof. In particular, string vibration occurs in the connecting strand. The output sounds of the speaker units (31, 32) are propagated, by this vibration, in the surface direction of the three-dimensional cubic knitted fabric, so that the three-dimensional cubic knitted fabric propagates and radiates a sound wave of the surface sound source. |
