The Bogen SPT30A is compact, high
intelligibility, reentrant type loudspeakers, designed for
one-way or two-way sound and communication systems.
Their sturdy, weatherproof, all-metal construction
is ideal for indoor and outdoor use in industrial
plants, warehouses, schools, construction sites, transportation
terminals, and recreational areas.
The Model SPT30A has a built-in, variable impedance
selector switch for matching the speaker power
requirements to a 25V or 70V constant-voltage line.