USA russian australia helicopter pilot headset use like david clark bose aviation headset PNR / ANR audio technology   USA russian australia helicopter pilot headset use like david clark bose aviation headset  pilot headset / headphone with noise cancelling Microphone   Detailed Product Description PNR audio technology Full spectrum stereo response Each ear cup features an independent volume control PNR Aviation Headset Helicopter Use U174/U Plug Super Soft Double Foam Head Pad Noise-canceling electret MicrophonePrecision flex boom for perfect microphone placement Easy-to-wear super soft silicone gel ear sealsHeadband Size AdjustmentCoiled cord from headset to molded plug, 70CMAssembled strictly following the FAA TSO standards Color: Black, green Noise Reduction Ratings (NRR):24dB Specifications HeadphoneType: Dynamic (F50)Frequency Response:100Hz to 8 kHzSensitivity:95+/-5 dB SPL (1 kHz, 1 mW input per earcup side) full volume on ear simulatorImpedance:150 ohms (300 ohms each; wired in parallel)Rate Input:100mWMax. Input: 250mWMicrophone and Amplifier:Element Type: Noise-canceling electretFrequency Response:100Hz to 5 kHzOperating Voltage (supplied by aircraft ):8-32 Volts DC Matching Impedance: 150-1000 ohmsSensitivity:-33+/-4 dB (ref: 0dB SPL=20.0uPa at 1 kHz with 10 Vdc 150 ohms AC load)   General Operating Temperature: -20 to 70°CCordage: AN-1000AH Coiled cord from headset to molded plug, 70CMIntercom Connections Plug: U174/UWeights: AN-1000AH ----560gNoise Reduction Specifications: Attenuation Frequency Band__________20Hz~20KHzMain Attenuation Frequency Band__________20Hz~600HzAttenuation Capability__________18~21dBPower Consumption__________30 mWHeadset size range Height: 10 to 14 cm   

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