The SPT5A is a 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 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.