The Bogen SPT5A and SP58A are compact reflex horn-type loudspeakers designed for one-way or two-way sound and communications systems.Their wide frequency response assures full-range background music reproduction making these loudspeakers an excellent choice for multi-purpose applications indoor or outdoor for use in industrial plants warehouses schools construction sites transportation terminals and recreational areas. The SPT5A has a built-in variable impedance selector switch for matching the speaker power requirements to a 25V or 70V constant-voltage line.The SP58A has an 8-ohm impedance. The loudspeakers measure 6in. in diameter and 4in. deep. Connections are made through a 12in. connecting cable.