Sennheiser HMEC 400 - Active Noise Cancellation Headsets

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The HMEC 400 is a pilot's headset with closed ear protector headphones and NoiseGard active noise compensation for use in helicopters, propeller and turbo-prop aircraft.

SENNHEISER HMEC 400 FEATURES
Constant attenuation of up to 40 dB throughout the entire audio range
Advanced transducer design ensures excellent speech intelligibility
Electronics fully integrated into headphone capsules
Can be used as conventional headphones when supply voltage is switched off
Noise-compensated boom microphone for superior speech transmission

SENNHEISER HMEC 400 SPECIFATIONS
Transducer principle (Headphones): dynamic
Frequency response (headphones): 45.....15000 Hz
Nominal impedance (active/passive): 300/150 Ohm-mono, 600/300 Ohm-stereo
Attenuation (active + passive): > 25 - 40 dB
Weight w/o cable: 380 g
Transducer principle (Microphone): Electret - MKE 45-1
Frequency response (microphone): 300.....5.000 Hz
Maximum sound pressure level (passiv): 120 dB
Output voltage: 400 mV +/- 3 dB / 114 dB/SPL
Operating voltage (stand alone): typ. 16 VDC (8-16 VDC, 8-25 mA)
Operating temperature: - 10.....+ 55 degC
Storage temperature: - 55.....+ 55 degC
NoiseGard-Supply: 12 - 35 VDC, ca. 27 mA, max. 80 mA
Specials: NoiseGard on/off & mono/stereo switch, Volume control for headphones
Connector: 6,3 mm stereo-headphones, PJ-068-mircophone, XLR-3 NoiseGard power

SENNHEISER HMEC 400 PACKAGE INCLUDES
1 HMEC 400 NoiseGard
1 x 3-pin input socket for aircraft's internal power supply
1 carrying case for headset and accessories
1 MZQ 2002-1 cable clip
1 MZW 45 windshield


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Sennheiser HMEC 400 - Active Noise Cancellation Headsets - Sound and Light

  Thursday 21 June 2018       


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29 HMEC 400 - Active 460 ear pads and ... active noise compensation for use in propeller and turbo prop aircraft. ... output voltage 400 mv ± 3db at 114 db/spl (as per rtca/do 214) the new