Electro-Voice 1160 Wall Mount Paging Amplifier 

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From EV:

The University Sound Models 1160 and 1110 are monaural solid state 60 watt and 100 watt RMS paging amplifiers. Other than their respective power output differences and the corresponding weight difference, the two models are identical. Four input channels are provided, consisting of three paging chan-: nels and one music channel. The three paging channels are configured as follows: the PHONE channel has a 500/600 ohm balanced transformer input to provide proper termination for the paging access output port of registered telephone equipment such as a PABX or switchboard. The MIC/LINE channel has balanced inputs which may be wired to accommodate either low impedance microphone or balanced line signals. The AUX channel has an unbalanced input with an input sensitivity of 250 mV for use as a paging input from preamplifiers or intercom systems. The MUSIC channel may receive its input from an external signal such as a tape deck or tuner. Paging priority is automatically established by a voice-activated circuit which mutes the music channel when any of the paging inputs are used. Separate BASS and TREBLE controls are provided to compensate for frequency response characteristics of the speaker system or the acoustical environment. In addition, a TRUMPET PROTECT switch is provided on the front panel. This serves to reduce the low frequency power delivered to horn-type paging projectors below their low-frequency cutoff to protect the speaker diaphragm from low-frequency over-excursion, as well as to reduce excessive loading of the amplifier at low frequencies. Power output terminals are provided for driving 4 ohm or 8 ohm direct speaker coil connections, as well as for 25 Volt and 70.7 Volt constant-voltage distribution lines. A BOOSTER AMP output jack is also provided so that supplemental amplifiers may be operated simultaneously. The 1160 and 1110 operate from a standard 120V AC 60 Hz power source, and are protected by pushto-reset circuit breakers. The units are housed in sturdy steel cabinets measuring 15.25" W x 11.75" H x 4.125" D (38.7 cm x 29.8 cm x 10.5 cm) with two metal flanges that permit mounting on a wall surface.