Dual-muff, hearing protector headset with boom microphone (NRR:27).
VHS-7T is certified intrinsically safe Class 1, Division 1, Group A/B/C/D by Factory Mutual Corp.
All C-AT headsets employ the same highly-directional, noise canceling two-wire, subminiature, capacitor microphone element designed to meet military specifications. The C-AT microphone assembly includes an electret element of the highest quality and reliability, and integral FET pre-amplifier enclosed in a weatherproof, shock and vibration resistant assembly.
Frequency: 100 Hz to 5 KHz (+/-2dB)
Sensitivity: -63 dB re 1V/microBar into 10K Ohm load
Supply Voltage: +1 to 20 VDC
Impedance: 3.5 Ohms (+/-10%)
Maximum THD: 3% at 1KHz (120 dB SPL)
Current Drain: 40 microamps nominal
Output level @ 1KHz with
30mVRMS drive level : 89+/-3dB SPL
Impedance: 1KHz with 30m Vrms drive level (89+/-3dB SPL)
Acoustic output level: (+15dBv drive) 110dB SPL
Frequency range: 400-4000Hz
DC resistance: 30+/-15% ohms @ 1KHz
Impedance: 150+/-15% ohms @ 1KHz
Hearing aid compatible per EIA RS 504'83 specification