Sennheiser NOISEGARD HMEC 305 User Manual

HeadsetHMEC 300HMEC 302HMEC 305HMEC 305-CHMEC 306HMEC 322HMEC 400HMDC 322111™Instructions for use

120Connecting the headsetsConnecting cables for headsetsHMEC 300 and HMEC 400 headsets:11/4” (6.35 mm) stereo jack plug for connecting the headphones1

121Connecting cable forHMEC 322 and HMDC 322HMEC 305-C headset:1 XLR-5 plug for connecting the headphones and the microphone1 XLR-3 plug for connectin

122Powering optionsThere are three options for powering the NoiseGard™ active noise compensation:1. Connection to the on-board system (12–35 V DC)2. C

1231. Connecting the headset to the on-board systemThe NoiseGard™ electronics can be connected to on-board power supply systems withoperating voltages

124Headset HMEC 302:씰 Connect the 1/4” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jackplug for the microphone to the corresponding j

1252. Connecting the headset to the battery pack(except HMEC 302, HMEC 305 and HMEC 306)The NoiseGard™ electronics of the HMEC 300, HMEC 305-C, HMEC 3

126Connecting the headset, turning on the battery pack씰 Connect the XLR-3 plug of the headset connecting cable to the XLR-3 socket on theconnecting ca

127 ACX-1 ACX-2 ACX-11 ACX-223. Connecting the headset via a cigarette lighter adapter cable(except HMEC 302, HMEC 305 and HMEC 306)Se

128Preparing the headsets for useAdjusting the headbandFor good noise attenuation and best possible comfort, the headband has to be adjustedto properl

129Positioning the microphoneRelocating the microphone boomThe microphone boom can be worn on either side of the mouth.씰 Loosen the quick-fixing devic

112ContentsSafety tips ...113Headset features ...

130For positioning the microphone of the HMDC 322 headset, proceed as follows:씰 Adjust the length of the microphone boom so that the microphone is pla

131Additional information for helicopter use of the HMEC 322 headsetThe polarity of the microphone connection in helicopters is not standardized. If t

132Using the headsetsTurning NoiseGard™ on/offWith the NoiseGard™ active noise compensation turned off, the headset can be used asa conventional heads

133Mic Gain AdjustmentAdjusting the microphone gainAccording to JTSO approval C58a, the microphone output voltage has to be factory-preset to 400 mV.

134Spare partsThe following spare parts are available from your Sennheiser agent:• Wind screen for MKE 45-1 electret microphone• Ear cushions• Headban

135Replacing the headband paddingReplace the headband padding if it is damaged.씰 Pull the Ziploc type fastening strips of the headband padding apart a

136In case of difficultyIf problems occur that are not listed in the below table, please contact your Sennheiseragent.ProblemClear communication but n

137ProblemActive noise compensation butvery low volume communicationPossible cause and what to doThe volume control is set too low.씰 Check the volume

138Valuable information on NoiseGard™The NoiseGard™ principleOne of the greatest stress factors today is noise. Research has shown that noise affectst

139AIn response to these problems, Sennheiser has developed an active noise compensationsystem – NoiseGard™ – which, combined with a high-quality pass

113The HMEC 300, HMEC 302, HMEC 305,HMEC 305-C, HMEC 306, HMEC 322, HMEC 400and HMDC 322 are pilot headsets with closed ear protector headphones and N

140The above diagram shows noise compensation with NoiseGard™: Passive hearingprotectors effectively attenuate noise from the middle and upper frequen

1412314213solder side531 2123 46Connector assignmentU174/U jack plug1 Microphone Lo2 Audio Hi3 Microphone Hi4 Audio LoHMEC 3001 Not assigned!2 Microph

142Technical dataHMEC 300 HMEC 302 HMEC 306 HMEC 400HeadphonesTransducer principle dynamicEar coupling circumaural, closedFrequency response 45–15,000

143HMEC 300 HMEC 302 HMEC 306 HMEC 400General dataConnecting cable 1.5 m, unilateralWeight without cable 370 gPower supply for NoiseGard™ 12–35 V DCCu

144Technical dataHMEC 305 앚HMEC 305-C 앚HMEC 322 앚HMDC 322HeadphonesTransducer principle dynamicEar coupling circumaural, closedFrequency response 45–1

145HMEC 305 앚HMEC 305-C 앚HMEC 322 앚HMDC 322General dataConnecting cable 1.5 m, unilateral 앚 coiled cable, unilateralWeight without cable 370 gPower su

146Certificate of ConformitySennheiser electronic GmbH & Co. KG declare that this device conforms to the applicable CE standards and regulations.F

114Headset featuresHMEC 300 NoiseGard™ headset• New active headset with effective attenuation of external noise across the entirefrequency spectrum du

115• Power supply for NoiseGard™ is provided via on-board power supply system,cigarette lighter socket or battery pack• Fail safe operation in case of

116HMEC 305-C NoiseGard™ headsetThe HMEC 305-C differs from the HMEC 300 in the following features:• No Mono/Stereo switch• Connection of headphones a

117HMEC 400 NoiseGard™ headsetThe HMEC 400 differs from the HMEC 300 in the following features:• Stylish silver design• Leatherette ear cushions• Head

118Delivery includesHMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets• Headset• 3-pin XLR socket for aircraft panel mounting (power suppl

119 ACX-1 ACX-2 ACX-11 ACX-22Recommended accessoriesReplaceable gel ear cushions (Cat. No. 83140)BP-03 battery pack (except for HMEC 3