- 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