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HMEC 46-1 Comparison with Telex Airman 850 Sennheiser HMEC 46-1 Feature Wearer Comfort Weight Clamping Pressure Ergonomic factors Headphone THD* ANR Performance Peak-Level Protection Volume Control Microphone Microphone sensitivity adjustment Warranty Serviceability Power 150 grams without cable 3 N with broad, soft ear pads Telex Airman 850 112 grams without cable 1.2 to 1.6 N (insufficient to stabilize headset – particularly in turbulent conditions) Split headband for better center of gravity Single (un-split) headband <1% Up to 9% Up to 22 dB with broad frequency range Eliminates incoming volume spikes >110 dB to protect user’s hearing Fully adjustable volume control available Noise compensating microphone, integrated POP noise protection Yes, potentiometer on boom side ear piece 5 years parts and labor Modular design enables boom and cable to be exchanged in the field; international service centers available 120 hours on 2 AA batteries; auto battery shut-off when headset unplugged extends battery life Up to 12 dB with narrow frequency range Not available Hi-Lo setting only (9 dB) Noise compensating microphone No, factory set 3 years Service center in Lincoln, NE Power from microphone bias voltage; ANR performance may be affected by low bias voltage *THD = Total Harmonic Distortion: Lesser THD allows the components in a loudspeaker, amplifier or microphone or other equipment to produce a more accurate reproduction by reducing harmonics added by electronics and audio media. A THD rating < 1% is considered to be in high-fidelity and inaudible to the human ear. January 15 to June 30 2011: Purchase a Sennheiser HMEC 46-1 B-K and receive a $100 manufacturer’s rebate from Sennheiser.