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Sennheiser HMEC 305, HMDC 322, HMEC 400, HMEC 322 manual Headset features, HMEC 300 NoiseGard headset

Models: HMEC 306 HMEC 305-C HMEC 302 HMEC 305 HMEC 322 HMEC 400 HMDC 322 HMEC 300

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Headset features

HMEC 300 NoiseGard™ headset

•New active headset with effective attenuation of external noise across the entire frequency spectrum due to NoiseGard™ active noise compensation

•NoiseGard™ active noise compensation provides clear communications even in the noisiest environment

•Excellent comfort due to very low weight, soft ear cushions and padded headband as well as best possible freedom of movement due to unilateral connecting cable

•Foldable headband for easy and space-saving storage

•Clear communications due to MKE 45-1 electret microphone with adjustable sensitivity

•Microphone can be easily positioned and worn on either left or right side due to flexible microphone boom with quick-fixing device

•Optimum radio reception due to headphone systems with wide frequency response

•Integrated volume control

•Adaption to the aircraft intercom system via Mono/Stereo switch

•With the NoiseGard™ active noise compensation turned off, the headset can be used as a conventional headset

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Sennheiser HMDC 322, HMEC 400, HMEC 322, HMEC 302, HMEC 305-C, HMEC 306 manual Headset features, HMEC 300 NoiseGard headset

Contents

HMEC HMEC HMEC HMEC 305-C HMEC HMEC HMEC HMDC HeadsetInstructions for use Contents Safety tips Safety tips Headset features HMEC 300 NoiseGard headsetHMEC 302 NoiseGard headset Product variantsHMEC 305 NoiseGard headset HMEC 306 NoiseGard headset HMEC 305-CNoiseGard headsetHMEC 322 NoiseGard headset HMEC 400 NoiseGard headset HMDC 322 NoiseGard headsetHMEC 302, HMEC 305 and HMEC 306 headsets Delivery includesRecommended accessories Replaceable gel ear cushions Cat. NoConnecting the headsets Connecting cables for headsetsHMEC 300 and HMEC 400 headsets HMEC 302 headsetHMEC 322 and HMDC 322 headsets HMEC 305-CheadsetHMEC 306 headset Connecting cable for HMEC 305-CPowering options Danger of short circuit 1. Connecting the headset to the on-boardsystemHMEC 300 and HMEC 400 headsets Headset HMEC Headset HMEC 305-CHMEC 322 and HMDC 322 headsets HMEC 305 headsetLED operation and battery status indication Inserting / replacing the the batteriesAttaching the battery pack to clothing Connecting the headset Preparing the headsets for use Adjusting the headbandPositioning the microphone Relocating the microphone boomTilt the microphone for final positioning 1.Pull the wind screen from the microphone Using the headsets Adjusting the volumeTurning NoiseGard on/off Exposure to loud sounds can cause hearing damageAdjusting the microphone gain Folding up the headphonesMic Gain Adjustment Attaching the cable clipReplacing the wind screen Spare partsReplacing the ear cushions Replacing the headband padding Replace the headband padding if it is damagedPut the new headband padding around the headband Join the fastening stripsIn case of difficulty ProblemPossible cause and what to do Problem Possible cause and what to doValuable information on NoiseGard The NoiseGard principlePage The above diagram shows noise compensation with NoiseGard Passive hearing protectors effectively attenuate noise from the middle and upper frequency range, the effect decreasing sharply in the lower range. However, active noise compensation with NoiseGard combined with passive hearing protectors results in a reduction of noise of approx. 25 dB in the 25-500Hz frequency range. The total attenuation resulting from active and passive noise compensation is about 30 dB over the entire audio range Connector assignment Technical data HeadphonesMicrophone incl. preamplifier HMECGeneral data HMECHMEC HMECHMEC 305-C HMDCTechnical data HeadphonesHMEC HMEC 305-CHMEC HMDCCertificate of Conformity