2.4
MIXER AMPLIFIER
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NOTE: Verify that the designated number of inputs
are sufficient to meet the requirements of the
design and increase the number of inputs if required.
Consideration should be given to the use of a
mixer-amplifier instead of a
mixer-preamplifier/power-amplifier combination.
Mixer-amplifiers may not be available for power
outputs of 200 watts or greater.
The required wattage rating will be inserted in the
blank. For radio system, this wattage may be
computed as follows: Allow 1 watt for each
loudspeaker. Use 1.4 multiplier for reserve power.
Auditorium systems will have an output of not less
than 20 watts or not less than 10 watts per 100
seats, whichever is greater. Special consideration
will be given to acoustics, speaker placement, and
the functions for which the system will be used,
particularly for large auditoriums where music will
be reproduced or amplified.
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Mixer amplifier shall as a minimum conform to the following specifications:
Rated Power Output (RPO): [35] [60] [125] [_____] watts RMS
Plus or Minus
3 dB,
20-20,000 Hz
Distortion:
Less than 1% at RPO, 60 - 13,000 Hz
Inputs:
2 microphones (high impedance or
low-impedance unbalanced
2 Aux. (high-impedance)
Output Impedance:
Balanced 4 and 8
ohms
Output Voltage:
25 and
70.7 volts
Power Requirement:
110-125 Vac 60 Hz
2.5
MICROPHONE INPUT MODULES
**************************************************************************
NOTE: Verify that the designated number of inputs
are sufficient to meet the requirements of the
design and increase the number of inputs if required.
**************************************************************************
Microphone input modules shall as a minimum conform to the following
specifications:
Rated Outputs:
0.25 volts into 10,000 ohms
1.0 volts into 10,000 ohms
SECTION 16770
Page 9
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