The Bogen FMH15T is a flange-mounted, high intelligibility, reentrant type loudspeaker. Its sturdy, weatherproof, vandal-resistant, all-metal construction is ideal for indoor and outdoor use in industrial plants, warehouses, schools, construction sites, transportation terminals, and recreational areas. The Model FMH15T has a built-in, rotary impedance selector switch for matching the speaker power requirements to a 70V or 25V constant-voltage line. Screw terminals make installation fast and easy. Accessory flush- or surface-mount enclosures, heavyduty cast aluminum grille and adapter ring are available to complete the installation of this unique speaker. Field maintenance is accomplished using a self-aligning, field replaceable diaphragm. Excellent voice intelligibility and efficiency Flange-mounted, reentrant type loudspeaker Weatherproof design for indoor or outdoor use Vandal-resistant, for applications in hostile environments All-metal construction with black enamel finish 15 watts max. @ 70V or 25V Weather-sealed variable-tap impedance selector switch Power levels are: 15, 7.5, 3.6, 1.8, or 0.9 watts for 70V systems and 15, 7.0, 1.8, 0.9, 0.5, 0.25, or 0.125 watts for 25V systems Screw terminals for fast and easy installation Self-aligning, field replaceable diaphragm for easy field maintenance Select flush (BBFM6) or surface (BBSM6) mount enclosure for installation (each sold separately) Heavy-duty cast aluminum grille (SGHD8) and adapter ring (FMHAR8) for installation (each sold separately)