Specifications - 3M c960 Service Information

Installation Instructions
Five-inch Speaker and Mic Assembly
78-6911-1545-1
Introduction
The Speaker and Mic Assembly consists of a five-inch, water-resistant, eight-ohm cone speaker, a special
weather-resistant dynamic microphone and a mounting bracket for easy mounting in menu signs, speaker posts
and other applications. Use this product where a separate microphone may provide better voice quality than that
of a combined speaker/mic.

Specifications

Dimensions
. . . . . . . . . . . . . . .
Cable Connections . . . . . . . . .
Microphone
Sensitivity . . . . . . . . . . . . . .
Impedance . . . . . . . . . . . . . .
Operating Temp. . . . . . . . . .
Speaker
Size . . . . . . . . . . . . . . . . . . .
Impedance . . . . . . . . . . . . . .
Power Capacity . . . . . . . . . .
Frequency Range . . . . . . . .
Sensitivity . . . . . . . . . . . . . .
Recommended Speaker and Mic Cable
Speaker . . . . . . . . . . . . . . . . . . .
Microphone . . . . . . . . . . . . . . .
Do not route speaker or microphone cables through the same conduit with
115 VAC electrical wiring. This violates the National Electrical Code,
presents a safety hazard and may cause hum pickup.
See Figure 1 on reverse.
Stripped and tinned wires
-71dB  3db at 1kHz (0dB = 1V/m Bar)
500 ohms  20% at 1kHz
o
-20 to +60 C (-4 to +40_F)
5 inches square
8 Ohms
6 watts maximum
110 Hz to 9 kHz (voice communication)
91 dB SPL for 1 watt @ 1 meter on axis
Use 18-gauge twisted-pair plus shield or unshielded cable.
Use 18-gauge twisted-pair plus shield cable. Connect the shield to COMMON
at the Intracom end only.
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