The Bogen SPT30A and SP308A are compact, high intelligibility, reentrant type loudspeakers, designed for one-way or two-way sound and communication systems. Their sturdy, weatherproof, all-metal construction is ideal for indoor and outdoor use in industrial plants, warehouses, schools, construction sites, transportation terminals, and recreational areas. The Model SPT30A has a built-in, variable impedance selector switch for matching the speaker power requirements to a 25V or 70V constant-voltage line. The model SP308A has an 8-ohm impedance only. High intelligibility and efficiency; ideal for both one-way and talk back applications Weatherproof, all-metal construction 30 watts; 25/70 volt or 8-ohm operation Tap settings for 70V: 30, 15, 7.5, 3.7, 1.8 watts; for 25V: 15, 7.5, 3.7, 1.8 watts Rotary tap impedance selector on SPT30A Tilt and swivel base for easy positioning Screw terminals make installation fast and easy All-purpose mounting bracket Self-aligning, field replaceable diaphragm Textured mocha enamel finish Limited lifetime warranty Mountable to I-beam flange using Bogen s BC1 Beam Clamp (sold separately) Mountable to electrical box using Bogen s HSES10 mounting strap (sold separately) Terminal Cover (TCSPT1) allows connection of conduit fittings to horn speakers (sold separately)