- Bogen metal box speakers - Rugged all-steel surface-mounted enclosure - Full range 8inch cone speaker for excellent intelligibility - Compatible with 25V or 70V amplifier systems - Multiple taps at 4 2 1 1/2 1/4 1/8 watts 4-watt maximum output power - Mounting hardware included (toggle bolts wood screws and wire crimps) - Knockouts for Wiremold - Recessed volume control at the center of front speaker grille