Technical Information - Bose II Owner's Manual

Technical Information

Sound pressure levels (SPL) are relative to 20 micro Pascal.
Earphones
Damage could occur to avionics equipment if it was manufactured for
use only with 600Ω (ohm) headsets. If in doubt, consult the avionics
equipment manufacturer.
Impedance
In mono mode: 480Ω (on) and 190Ω (off) at 1kHz.
In stereo mode: left, 500Ω (on), 190Ω (off); right, 2000Ω (on), 190Ω (off).
Frequency response
20Hz - 15kHz
Sensitivity
90dB SPL measured at 1mW, 1kHz, full volume on flat plate coupler
Microphone
Bias Required:
8 to 16VDC through 220Ω to 2200Ω
Sensitivity:
Depends upon bias and radio AC input impedance. Typical output is
300mV at 114dB SPL. To assure proper modulation of your radio, it is
recommended that you have your avionics technician adjust its input to
match the output of your headset's microphone.
Active noise reduction
Active Noise Reduction Bandwidth:
30Hz - 700Hz
Noise floor
28dBA SPL (typical)
Maximum ambient noise level
Approximately 118dB SPL at full cancellation
Voltage
7-32VDC
Current
60mA typical, 120mA maximum operating
Fuse/breaker recommended
1 / amp fast blow (AGC 1 / fuse)
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