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HMEC 350/352/355
355-C/356/372/450
HMDC 372
Instructions for use
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Contents Safety tips ..................................................................................................................................................... 3 Headset features ........................................................................................................................................ 4 Product variants .......................................................................................................................................... 5 Delivery incl
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The HMEC 350, HMEC 352, HMEC 355, HMEC 355-C, HMEC 356, HMEC 372, HMEC 450 and HMDC 372 are pilot headsets with closed ear protector headphones and NoiseGard™ active noise compensation for use in helicopters, propeller and turboprop aircraft. Safety tips • With the NoiseGard™ active noise compensation turned on, typical aircraft sounds (for example, those from engines, propellers, warning alarms, etc.) may sound different to you. Before operating any aircraft, make sure that, with NoiseGard™ tu
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Headset features HMEC 350 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 • Improved acoustic properties: The frequency response of the headphones has been optimised in the 1 to 4 kHz region to give significantly increased speech intelligibility over the HMEC 300 series • Exce
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• With the NoiseGard™ active noise compensation turned off, the headset can be used as a conventional headset • Power supply for NoiseGard™ is provided via on-board power supply system, cigarette lighter socket or battery pack • Fail safe operation in case of power failure • Supply voltage for the NoiseGard™ system is processed by the in-line electronics in the connecting cable • Made in Germany, 5-year warranty (HMEC 450: 10-year warranty) Product variants HMEC 352 NoiseGard™ headset The HMEC
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HMEC 355-C NoiseGard™ headset The HMEC 355-C differs from the HMEC 350 in the following features: • No Mono/Stereo switch • Connection of headphones and microphone via XLR-5 plug • Connection of NoiseGard™ electronics via XLR-3 plug HMEC 356 NoiseGard™ headset The HMEC 356 differs from the HMEC 350 in the following features: • Connection of headphones, microphone and NoiseGard™ electronics to the on-board power supply system (12–35 V DC) via 6-pin Redel plug HMEC 372 NoiseGard™ headset The HMEC
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HMEC 450 NoiseGard™ headset The HMEC 450 differs from the HMEC 350 in the following features: • Stylish silver design • Leatherette ear cushions • Headband padding can be buttoned HMDC 372 NoiseGard™ headset The HMDC 372 differs from the HMEC 350 in the following features: • No Mono/Stereo switch • Coiled cable • M-87/AIC dynamic microphone and low impedance headphones • Connection of headphones and microphone via U-174/U jack plug to a low impedance interface in the helicopter 7
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Delivery includes HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets •Headset • 3-pin XLR socket for aircraft panel mounting (power supply via the on-board system) • Padded carry and storage bag with shoulder strap for headset and accessories • Wind screen for microphone (except HMDC 372) • MZQ 2002-1 cable clip (Cat. No. 044740) HMEC 352, HMEC 355 and HMEC 356 headsets •Headset • Padded carry and storage bag with shoulder strap for headset and accessories • Wind screen for microphon
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Recommended accessories Replaceable gel ear cushions (Cat. No. 092807) BP-04 battery pack (Cat. No. 500357) (except for HMEC 352, HMEC 355 and HMEC 356) Battery pack with XLR-3 socket for powering the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets. Four 1.5 V AA size alkaline manganese batteries (IEC LR 6) ensure approx. 15 hours of reliable operation (batteries are not included in the delivery). Length of connecting cable: 0.9 m. Adapter cables (exc
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Connecting the headsets Connecting cables for headsets HMEC 350 and HMEC 450 headsets: 1 ¼” (6.35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics Connecting cable for HMEC 350 and HMEC 450 HMEC 352 headset: 1 ¼” (6.35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone and the power supply for the NoiseGard™ electronics C
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HMEC 355-C headset: 1 XLR-5 plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics Connecting cable for HMEC 355-C HMEC 356 headset: 1 6-pin Redel plug for connecting the headphones, the microphone and the power supply for the NoiseGard™ electronics Connecting cable for HMEC 356 HMEC 372 and HMDC 372 headsets: 1 U-174/U jack plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply
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Connector assignment Redel connector (NoiseGard™) XLR-3 connector (NoiseGard™) XLR-5 connector 1 Power supply NoiseGard™ (DC+) 1 Power supply NoiseGard™ (DC+) HMEC 355 HMEC 355-C 2Audio Lo / DC – 2 Ground 1Audio Hi 1Audio Hi 3Audio Hi left 3– * 2 Audio Lo / DC – 2 Audio Lo 4Audio Hi right 3 Microphone Hi 3Microphone Hi 5Microphone Hi 4Microphone Lo 4Microphone Lo 6 Microphone Lo 5 Power supply NoiseGard™ (DC+) 5 Not assigned! ¼” (6.35 mm) stereo jack plug U174/U j
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Powering options There are three options for powering the NoiseGard™ active noise compensation: 1. Connection to the on-board system (12–35 V DC) 2. Connection to the BP-04 battery pack (accessory, except for HMEC 352, HMEC 355 and HMEC 356) 3. Connection to the cigarette ligther socket (12–35 V DC) via adapter cable (accessory, except for HMEC 352, HMEC 355 and HMEC 356) The supply voltage for the NoiseGard™ system is processed by the in-line electronics in the connecting cable. Danger of sho
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1. Connecting the headset to the on-board system The NoiseGard™ electronics can be connected to on-board power supply systems with operating voltages between 12–35 V DC. Danger of short circuit! Before turning on NoiseGard™, ensure that the on-board power supply system is protected by a 1 A fuse. The HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets are supplied with an XLR-3 socket for panel mounting in the aircraft. The XLR-3 socket must be Power supply for NoiseGard™ mounted by
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HMEC 352 headset: Connect the ¼” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack plug for the microphone to the corresponding jack sockets of your intercom. HMEC 355 headset: Connect the XLR-5 plug to the aircraft’s XLR-5 socket. HMEC 355-C headset: Connect the XLR-5 plug for the headphones and the microphone to the aircraft’s XLR-5 socket. Connect the XLR-3 plug to the XLR-3 socket. HMEC 356 headset: Connect the 6-pin Redel plug to the corresponding socket in the ai
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2. Connecting the headset to the battery pack (except HMEC 352, HMEC 355 and HMEC 356) The NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC372 headsets can also be powered via the BP-04 battery pack (see “Recommended accessories” on page 9). The battery pack can be operated either on standard or rechargeable batteries (not included in the delivery). However, to ensure a longer operating time, we would recommend using standard AA size alkaline manganese batteries (
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Connecting the headset, turning on the battery pack Connect the XLR-3 plug of the headset connecting cable to the XLR-3 socket on the connecting cable of the battery pack. HMEC 350 and HMEC 450 headsets: Connect the ¼” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack plug for the microphone to the corresponding jack sockets of your intercom. HMEC 355-C headset: Connect the XLR-5 plug for the headphones and the microphone to the aircraft’s XLR-5 socket. HMEC 372 and HMDC 37
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3. Connecting the headset via a cigarette lighter adapter cable (except HMEC 352, HMEC 355 and HMEC 356) Sennheiser offers special adapter cables with XLR-3 socket for connecting the NoiseGard™ electronics of the HMEC 350, HMEC 355-C, HMEC 372, HMEC 450 and HMDC 372 headsets to the on-board power supply via the cigarette lighter socket: • ACX-1 adapter cable for powering one headset via the cigarette lighter socket ACX-1 ACX-2 • ACX-2 adapter cable for powering two headsets via the cigarette li
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Preparing the headsets for use Adjusting the headband For good noise attenuation and best possible comfort, the headband has to be adjusted to properly fit your head: Wear the headset so that the headband runs over the top of your head. Adjust the length of the headband so that • your ears are completely inside the ear cushions, • you feel even, gentle pressure around your ears, • a snug fit is ensured. Note: Make sure not to squeeze any connecting cable when adjusting the headband. Squee
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Positioning the microphone Relocating the microphone boom The microphone boom can be worn on either side of the mouth. Loosen the quick-fixing device. Rotate the microphone boom by 180°. Tighten the quick-fixing device. Positioning the microphone towards the corner of the mouth The HMEC 350, HMEC 352, HMEC 355, HMEC 355-C, HMEC 356, HMEC 372 and HMEC 450 headsets feature a flexible microphone boom. Bend the microphone boom so that the microphone is placed at the corner of the mouth. Mai
