Frequency Response: [20 to 20,000] [20 to 29,000] [30 to 20,000] [20 to___]
(Hz)
Noise Level (below
raised output in dB):
[75]
[75]
[80]
[75]
Load Impedance
70 volts (ohms):
[100]
[50]
[25]
[15]
Load Impedance
25 volts (ohms):
[12.5]
[6.25]
[3.25]
[1.88]
Power Required at
Rated Output(watts):
[125]
[240]
[600]
[840]
Rack Mounting:
[140]
[220]
[310]
[355]
Rack Mounting:
[5 1/2]
[8 3/4]
[12 1/4]
[14]
(mm) (Inches)
a.
Pre-amplifier shall be solid state for use with the power
amplifiers specified and shall be [rack] [shelf]-mounted. Provide
pre-amplifier with power on-off switch, monitor volume control,
program volume control, and call selector switch and VU meter.
Connections shall be made between the station selector switch
panel for either "program" or "monitoring" of selected stations.
Pre-amplifier shall as minimum conform to the following:
(1)
Power output:
Compatible with power amplifiers
(2) Frequency response:
Plus and minus [_____] dB from 20 Hz to
20,000 Hz
(3)
Noise level:
-50 dB
(4)
Distortion:
Less than 5 percent
b.
Booster amplifiers shall be solid state type incorporated into
total system to amplify audio signal from central power
amplifiers. Booster amplifier shall be [rack] [shelf]-mounted and
shall as minimum conform to not less than the following
specifications:
(1)
Power output:
15 watts
(2)
Peak power output:
25 watts
(3) Frequency response:
Plus and minus [_____] dB from 20 Hz to
12,000 Hz
(4)
Noise level:
-50 dB
(5)
Distortion:
Less than 5 percent
2.1.5.5
Microphone
Microphone shall be dynamic, omni-directional type with desk stand and
touch-to-talk bar. Frequency range shall be from 60 to 10,000 Hz.
Construction shall be of die cast zinc alloy. Finish shall be satin
SECTION 16822N
Page 18
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