Technical information

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Technical Information
Sound pressure levels (SPL) are relative to 20 micropascals.
Headphone Damage could occur to avionics equipment that is intended for
use only with 600-ohm headsets. If in doubt, consult the avionics
equipment manufacturer.
Impedance Monaural mode: 160 ohms (ON) and 230 ohms (OFF) at 1 kHz
Stereo mode: 320 ohms (ON), 460 ohms (OFF)
Frequency response 15 Hz to 15 kHz
Sensitivity: 90 dB SPL typical, measured at 1mw, 1kHz, full
volume on KEMAR ear simulator
Microphone Bias required: 8 to 16 VDC through 220 to 2200 ohms
Sensitivity: Varies depending upon bias and radio AC input
impedance. Typical output is 300 mV at 114 dB SPL. To assure
proper modulation of the radio, it is recommended that an
avionics technician adjust its input to match the output of the
microphone.
Microphone Impedance: 5 ohms
Sensitivity: Equivalent to M-87/M-101
Maximum ambient 110 dB SPL
Voltage Battery powered: 9-volt alkaline
Aircraft powered: 10 to 32 VDC
Battery life Alkaline: Up to 20 hours in typical aircraft noise (decreases at
cold temperatures)
Current Operating: 25 ma in typical aircraft noise
Fuse/ breaker
1
/
4
-amp, fast-blow fuse (AGC
1
/
4
fuse) or
1
/
2
-amp circuit breaker
Headset weight 12 ounces (340 grams) on the head when cable is supported by
the mounting clip
Headset size range Breadth: 4.8 to 6.3 inches
Height: 4.5 to 5.7 inches
Temperature and Operating: 5 to 131˚F (-15 to 55˚C)
Storage: -67 to 158˚F (-55 to 70˚C)
Altitude: 15,000 feet maximum pressure altitude for full
cancellation
(Electret)
(Dynamic)
noise level
Altitude
(Category A)
recommended