Sennheiser SH350 User Manual
HMEC 350/352/355
355-C/356/372/450
Instructions for use
HMDC 372
Contents Safety tips ..................................................................................................................................................... 3
Headset features ........................................................................................................................................ 4
Product variants .......................................................................................................................................... 5
Delivery includes ......................................................................................................................................... 8
Recommended accessories ..................................................................................................................... 9
Connecting the headsets ....................................................................................................................... 10
Connecting cables for headsets .......................................................................................................... 10
Connector assignment .......................................................................................................................... 12
Powering options .................................................................................................................................. 13
Preparing the headsets for use ........................................................................................................... 19
Adjusting the headband ...................................................................................................................... 19
Positioning the microphone ................................................................................................................ 20
Using the headsets .................................................................................................................................. 22
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™ ............................................................................................... 26
In case of difficulty ................................................................................................................................... 28
Technical data ............................................................................................................................................ 30
2
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™
turned on, you can hear and recognize these sounds. Set the volume to safe levels
that do not interfere with your ability to hear informational sounds and warning
alarms.
• Do not attempt to repair the headset yourself. If problems occur, contact your
Sennheiser agent for assistance.
• 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,
contact your Sennheiser agent.
3
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
• 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 pre-polarized condenser 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
• Integrated volume control
• Adaption to the aircraft intercom system via Mono/Stereo switch
4
• 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 352 differs from the HMEC 350 in the following features:
• Connection of microphone and NoiseGard™ electronics via PJ-068 plug
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
5
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 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
6
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
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 microphone
• MZQ 2002-1 cable clip (Cat. No. 044740)
8
ACX-1
ACX-11 ACX-22
ACX-2
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 (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 onboard power supply via the cigarette lighter socket:
• ACX-1 adapter cable for powering one headset via the cigarette lighter socket
• ACX-2 adapter cable for powering two headsets via the cigarette lighter socket
The adapter cables are also available with a right-angled jack plug featuring a 7.5 A fuse
and a green LED operation indicator:
• ACX-11 adapter cable for powering one headset via the cigarette lighter socket
• ACX-22 adapter cable for powering two headsets via the cigarette lighter socket
9
10
Connecting cable for
HMEC 350 and HMEC 450
Connecting cable for
HMEC 352
Connecting cable for
HMEC 355
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
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
HMEC 355 headset:
1 XLR-5 plug for connecting the headphones, the microphone and the power supply for
the NoiseGard™ electronics
Connecting cable for
HMEC 355-C
Connecting cable for
HMEC 356
Connecting cable for
HMEC 372 and HMDC 372
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
HMEC 356 headset:
1 6-pin Redel plug for connecting the headphones, the microphone and the power
supply for the NoiseGard™ electronics
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 for the NoiseGard™ electronics
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