The BS678BT, of which cabinet is made of wood, can be installed in a vertical or horizontal orientation. Either concealed inwall wiring or exposed wiring can be used for speaker cable connection. The speaker structure that permits direct wallmounting with screws prevents the speaker from falling easily even if an outward force is applied to. The input impedance can be easily changed by changing the tap position of the transformer. Two builtin 6inch double cone speaker units deliver high quality sound. The pushin type input connector makes cable connections easy and allows bridge wiring. BS678BT have a builtin attenuator and can be connected to a 2wire or 3wire system.