Table of Contents
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Table of Contents
Related Manuals for Sennheiser SH350
Summary of Contents for Sennheiser SH350
- Page 1 HMEC 350/352/355 355-C/356/372/450 HMDC Instructions for use...
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Page 2: Table Of Contents
Turning NoiseGard™ on/off ... 22 Mono/Stereo selection (except HMEC 355, HMEC 355-C, HMEC 372 and HMDC 372) ... 22 Adjusting the volume ... 22 Attaching the cable clip ... 23 Folding up the headphones ... 23 Spare parts ... 24 Valuable information on NoiseGard™... -
Page 3: Safety Tips
• Only replace parts of the headset whose replacement is described in this manual. All other parts of the headset must be replaced by your Sennheiser agent. • Do not immerse the headset in water! For information on how to clean the headset,... -
Page 4: Headset Features
• 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 •... -
Page 5: Product Variants
HMEC 355 NoiseGard™ headset The HMEC 355 differs from the HMEC 350 in the following features: • No Mono/Stereo switch • Connection of headphones, microphone and NoiseGard™ electronics to the on-board power supply system (12–35 V DC) via XLR-5 plug... - Page 6 HMEC 372 NoiseGard™ headset The HMEC 372 differs from the HMEC 350 in the following features: • No Mono/Stereo switch • Coiled cable • Connection of headphones and microphone via U-174/U jack plug to a high impedance interface in the helicopter...
- Page 7 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...
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Page 8: Delivery Includes
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 •... -
Page 9: Recommended Accessories
(batteries are not included in the delivery). Length of connecting cable: 0.9 m. Adapter cables (except for HMEC 352, HMEC 355 and HMEC 356) Sennheiser offers special adapter cables 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: •... -
Page 10: Connecting The Headsets
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 HMEC 355 headset: 1 XLR-5 plug for connecting the headphones, the microphone and the power supply for the NoiseGard™ electronics... - Page 11 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...
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Page 12: Connector Assignment
Redel connector (NoiseGard™) 1 Power supply NoiseGard™ (DC+) 1 Power supply NoiseGard™ (DC+) HMEC 355 2 Audio Lo / DC – 3 Audio Hi left 4 Audio Hi right 5 Microphone Hi 6 Microphone Lo ¼” (6.35 mm) stereo jack plug 1 Audio Hi left 2 Audio Hi right 3 Audio Lo... -
Page 13: Powering Options
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™... - Page 14 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.
- Page 15 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.
- Page 16 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 HMDC 372 headsets can also be powered via the BP-04 battery pack (see “Recommended accessories”...
- Page 17 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.
- Page 18 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: •...
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Page 19: Preparing The Headsets For Use
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 •... -
Page 20: Positioning The Microphone
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. - Page 21 For positioning the microphone of the HMDC 372 headset, proceed as follows: Adjust the length of the microphone boom so that the microphone is placed at the corner of the mouth. To do so, loosen the quick-fixing device and adjust the microphone boom in length.
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Page 22: Using The Headsets
Using the headsets Turning NoiseGard™ on/off With the NoiseGard™ active noise compensation turned off, the headset can be used as a conventional headset. Turn on the NoiseGard™ active noise compensation by setting the ON/OFF switch to “ON”. When using the BP-04 battery pack, set the NoiseGard™ ON/OFF switch to “ON” and use the ON/OFF switch on the battery pack. -
Page 23: Attaching The Cable Clip
Folding up the headphones For easy and space-saving transportation, the earcups can be folded up and tucked between the headband. Unfold the headphones by grasping both earcups and pulling them down and away from the headband. -
Page 24: Spare Parts
Spare parts The following spare parts are available from your Sennheiser agent: • Wind screen for MKE 45-1 • Ear cushions for all variants except HMEC 450 • Ear cushions for HMEC 450 • Soft ear cushions for HMEC 450 •... - Page 25 Replacing the headband padding Replace the headband padding if it is damaged. Pull the Ziploc type fastening strips of the headband padding apart and remove the worn headband padding. Put the new headband padding around the headband. Pull the two edges of the headband padding together so that the fastening strips slightly overlap.
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Page 26: Valuable Information On Noisegard
High frequencies are reduced considerably, but low frequency wind and engine noise, the most prominent noise in many of today's aircrafts, is attenuated very little. In response to these problems, Sennheiser has developed an active noise compensation system – NoiseGard™ – which, combined with a high-quality passive hearing protector, provides consistent noise attenuation over the entire audio range. - Page 27 NoiseGard™ active noise compensation is achieved by generating a signal identical in sound pressure level but exactly reversed in phase to the noise signal, the effect being that the out-of-phase signal cancels most of the noise signal. Active noise compensation is accomplished in the following manner: Each earcup includes a microphone, a feedback control circuit, and a transducer to reproduce both the communication and the noise cancelling signal.
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Page 28: In Case Of Difficulty
Problem Clear communication but no active noise compensation In case of difficulty If problems occur that are not listed in the below table, please contact your Sennheiser agent. Possible cause and what to do The NoiseGard™ electronics are turned off. - Page 29 Problem Active noise compensation but very low volume communication Active noise compensation but reduced intelligibility Communications in one ear only (only HMEC 350, HMEC 352, HMEC 356 and HMEC 356) Possible cause and what to do The volume control is set too low. Check the volume setting of the headset.
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Page 30: Technical Data
Technical data Headphones Transducer principle Ear coupling Frequency response Nominal impedance active/passive Attenuation (active and passive) Max. sound pressure level Contact pressure Microphone incl. preamplifier Transducer principle Frequency response Sensitivity Max. sound pressure level Min. terminating impedance Output voltage Supply voltage... - Page 31 XLR-3 for NoiseGard™ NoiseGard™ Mono/Stereo switch On/off switch for NoiseGard™ Volume control for headphones Operation –15 °C ... +55 °C Storage –55 °C ... +55 °C with batteries (four 1.5 V AA size alkaline-manganese batteries): approx. 15 hours with NiMH rechargeable batteries: approx.
- Page 32 Technical data Headphones Transducer principle Ear coupling Frequency response Nominal impedance active/passive Attenuation (active and passive) Max. sound pressure level Contact pressure Microphone incl. preamplifier Transducer principle Frequency response Sensitivity Max. sound pressure level Min. terminating impedance Output voltage Supply voltage...
- Page 33 –55 °C ... +55 °C with batteries (four 1.5 V AA size alkaline-manganese batteries): approx. 15 hours with NiMH rechargeable batteries: approx. 15 hours HMEC 372 HMDC 372 coiled cable, unilateral U-174/U jack plug for headphones and microphone, XLR-3 for NoiseGard™...
- Page 34 Directive 89/336/EEC and 73/23/EEC. Guarantee Certificate The guarantee period for this Sennheiser product is 5 years from the date of purchase. Excluded are accessory items, rechargeable or disposable batteries that are delivered with the product; due to their characteristics these products have a shorter service life that is principally dependent on the individual frequency of use.
- Page 36 Sennheiser electronic GmbH & Co. KG 30900 Wedemark, Germany Phone +49 (5130) 600 0 Fax +49 (5130) 600 300 www.sennheiser.com Printed in Germany Publ. 04/05 512743 / A04...