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 6" in diameter and 4" deep. Connections are made through a 12" connecting cable. High intelligibility and efficiency Passive loudspeaker Ideal for both one-way and two-way applications 7.5 watts 25/70V or 8-ohm operation Variable-tap impedance selector on SPT5A All-purpose mounting bracket for precise positioning, both vertically and horizontally Weatherproof, all-metal construction Textured mocha enamel finish