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 variable 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.