FMH15T - 

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.