Plus or Minus 2 dB, 20 - 20,000 Hz
Distortion:
Less than 0.5 percent 20 - 20,000 Hz
Inputs:
4 transformer - coupled balanced 150 ohm
Input Sensitivity:
0.003 volts
Input Channel
Isolation:
70 dB minimum
2.6
MICROPHONES
2.6.1
Desk Microphone
Microphones shall as a minimum conform to the following specifications:
Element:
Dynamic
Pattern:
Cardioid
50 - 12,000 Hz
Low impedance mic (150-400 ohms)
Front-to-back Ratio:
20 dB
Selector switches:
Selector switches for zone shall be
be [integral microphone] or [Separate
console adjacent to microphone]
2.6.2
Gooseneck Microphone
Gooseneck microphone shall meet the minimum requirements of the desk
microphone. Microphone shall have push to talk button. Gooseneck tube
length shall be [305] [406] [_____] mm [12] [16] [_____] inch.
2.6.3
Microphone Jack
Each outlet for microphones shall consist of a standard outlet box,
flush-mounted, and fitted with a three-pole, polarized, locking-type,
female microphone jack and a corrosion resistant-steel device plate.
2.7
LOUDSPEAKERS
**************************************************************************
NOTE: Indicate on drawings type of speaker and
location. Horn Speaker shall be specified only in
areas with high ambient noise or outdoors. High
output speaker enclosures shall be restricted to
large open spaces i.e. gymnasiums, auditoriums or
commons
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SECTION 16770
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