Sennheiser HMEC 26-2 User manual

Instruction manual
HMEC 26-2

Important safety information
HMEC 26-2 | 1
Important safety information
왘Please read this instruction manual carefully and
completely before using the product.
왘Always include this instruction manual when passing the
product on to third parties.
왘This instruction manual is also available on the Internet at
www.sennheiser-aviation.com or www.sennheiser.com.
Preventing health problems and accidents
왘Always maintain a distance of at least 3.94“ (10 cm)
between the ear cups and the cardiac pacemaker or
implanted defibrillator since the product generates
permanent magnetic fields.
왘Keep product, accessory and packaging parts out of reach
of children who could swallow smaller pieces.
왘Switch the product off after use to conserve battery
power. Remove the rechargeable batteries if the product
will not be used for extended periods of time.
왘If during flight operation you, as the pilot, operate your
connected device using the headset, this can limit your
attention. During flight operation, do not use the headset
for making phone calls or listening to music.
왘With the NoiseGardTM noise compensation switched 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

Important safety information
2 | HMEC 26-2
NoiseGardTM switched 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.
왘The product is capable of producing sound pressure
exceeding 85 dB(A). In many countries 85 dB(A) is the
maximum legally permissible level for continuous noise
exposure during the working day. Do not listen at high
volume levels for long periods of time to prevent hearing
damage.
Preventing damage to the product and dysfunctions
왘Always keep the product dry and do not expose it to
extreme temperatures (hairdryer, heater, extended
exposure to sunlight, etc.) to avoid corrosion or
deformation.
왘Only clean the product with a soft, dry cloth.
왘Never repair or attempt to repair a defective product
yourself. Contact your Sennheiser partner or the
Sennheiser Service Department.
왘Only replace parts of the product whose replacement is
described in this manual. All other parts of the product
must be replaced by your Sennheiser partner.

Important safety information
HMEC 26-2 | 3
Intended use
Intended use of the product includes
• having read and understood this instruction manual,
especially the chapter “Important safety information” on
page 1,
• using the product within the operating conditions and
limitations described in this instruction manual.
“Improper use” means using the product other than as
described in this instruction manual, or under operating
conditions which differ from those described herein.

The HMEC 26-2 headset
4 | HMEC 26-2
The HMEC 26-2 headset
The HMEC 26-2 headset with NoiseGard™ professional active
noise compensation features dynamic, closed headphones.
The noise-compensating condenser microphone ensures
excellent speech transmission even in noisy environments.
Designed for use in aircraft cockpits.
Features
•NoiseGard™activenoisecompensation reduces ambient
noise by up to 18 dB – consequently the radio volume can
be decreased
• Lightweight
• Extremely comfortable to wear due to the patented two-
piece automatic headband and soft ear pads
• Peak level protection (cannot be switched off) safeguards
you from volume peaks above 110 dB
• “Flip-away” headphone allows single-sided listening
• Flexible microphone boom, can be worn on either left or
right-hand side
• Noise-compensating condenser microphone ensures
excellent speech transmission
• Single-sided cable, easy to replace

Package contents
HMEC 26-2 | 5
• With NoiseGard™ switched off, the headset can be used
as a conventional headset
• Power supply for NoiseGard™ from aircraft DC power
supply system (on suitably equipped aircraft) or
batteries/rechargeable batteries
• “Auto shut-off” extends battery life
• TalkThrough function (HMEC 26-2-T only)
• ETSO approval C139
• 5 year warranty
Package contents
1HMEC26-2headset
1 cable clip
1 wind and pop screen
1 pair of hygiene pads
1 audio cable with 2.5 mm jack plugs*
1 audio cable with 3.5 mm jack plugs*
1beltclip*
1 carry bag*
1 instruction manual
1 EASA Form 1
* not supplied with all product variants (see page 23)

Operation
6 | HMEC 26-2
Operation
Putting on the headset
When putting on the headset, the patented two-piece
headband adjusts automatically.
Flipping away one earcup
The headset features a “flip-away” earcup for single-sided
listening.

Operation
HMEC 26-2 | 7
Positioning the microphone
Bend the flexible microphone boom so that the microphone is
placed at the corner of the mouth. Maintain a distance of
2cm between microphone and mouth. Always use the
supplied wind and pop screen.
Turning the microphone boom
The microphone boom can be rotated. This allows the
headset to be worn with the microphone boom positioned on
either the left or right-hand side of the head.

Operation
8 | HMEC 26-2
Adjusting the volume directly on the audio system
Connect the headset to the corresponding sockets of your
audio system. Adjust the volume directly on the audio
system.
Adjusting the microphone sensitivity
Turn a small screwdriver in the direction of the arrow to
change the microphone sensitivity.
CAUTION
Hearing damage due to high volumes!
This headset is capable of producing high sound
pressure levels. Higher volumes or longer durations
can damage your hearing!
왘Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning
alarms.
+
–

The control units of the HMEC 26-2
HMEC 26-2 | 9
The control units of the HMEC 26-2
Control unit I
1Volume controls
2LED
3NoiseGard™ ON/OFF switch
4Mono/stereo switch /
5BOOM switch L/R
63.5 mm jack socket
7Battery compartment
82.5 mm jack socket
Headset with
control unit I
Operating element
12345678
Cable -BV-K-2
Cable -B-K-2
Cable -B-KP-2
Cable -B-CP-2
Cable -V-KX-2

The control units of the HMEC 26-2
10 | HMEC 26-2
Control unit II
2LED
3NoiseGard™ ON/OFF switch
Headset with
control unit II
Operating element
12345678
Cable -CP
Cable -CP-2
Cable -KP
Cable -KP-2
Cable -NP
Cable -RP-2
Cable -DP-2

Using the headset
HMEC 26-2 | 11
Using the headset
Switching NoiseGard™ on/off
The NoiseGard™ ON/OFF switch 3allows you to switch the
NoiseGard™ active noise compensation on or off. With
NoiseGard™ switched off, the headset can be used as a
conventional headset.
왘Set the NoiseGard™ ON/OFF switch 3to the desired
position:
Position Function
ON NoiseGard™ is switched on.
The LED 2lights up, indicating the battery charge
status (see page 13) or power supply via the
aircraft DC power supply system.
OFF NoiseGard™ is switched off.
The LED 2is off.

Using the headset
12 | HMEC 26-2
Adjusting the volume
The two slide volume controls 1allow you to adjust the
volume for the left and right channel separately.
Switching between mono and stereo mode
The mono/stereo switch 4allows you to switch between
mono (
 ) and stereo (  ) mode, depending on the audio
system.
Changing the left and right stereo channel
The position “R” or “L” of the BOOM switch 5corresponds to
the position of the microphone on the left or right side of the
mouth. When the microphone boom is rotated to permit left
or right side microphone orientation, the BOOM switch allows
you to correctly assign the audio channels (L/R) to the
appropriate headphone sides. This enables the correct
orientation of the volume controls and any stereo audio
signals. To move the BOOM switch, use a pointed tool.
CAUTION
Hearing damage due to high volumes!
This headset is capable of producing high sound
pressure levels. Higher volumes or longer durations
can damage your hearing!
왘Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning
alarms.

Using the headset
HMEC 26-2 | 13
Powering NoiseGard™ via two (rechargeable) batteries
왘Insert two 1.5 V AA alkaline batteries (IEC LR 6) or two
1.2 V AA rechargeable batteries (IEC LR 6). Observe
correct polarity when inserting the batteries.
The operating time with batteries/rechargeable batteries
is approx. 60 hours. With NoiseGard™ switched on (see
page 11), the LED 2provides information on the
remaining battery/rechargeable battery capacity:
Activating the “auto shut-off” function
The battery-saving “auto shut-off” function automatically
switches the NoiseGard™ electronics off when the headset is
disconnected from the audio system or when the aircraft
avionics are switched off. The headset is delivered ex-works
with the function deactivated. You can activate “auto shut-
off” as follows:
LED 2Meaning
lights up yellow The battery capacity is sufficient.
lights up red The batteries are flat. Replace the batteries.

Using the headset
14 | HMEC 26-2
왘Set the switch to the position ASO.
Switching the TalkThrough function on/off (HMEC 26-2-T only)
The headset provides excellent attenuation of ambient
noise. In order to allow you to communicate undisturbed
with your surroundings while wearing the headset, the
HMEC 26-2-T features a TalkThrough function. With
TalkThrough switched on, a separate microphone 9picks up
acoustic signals in the immediate vicinity. Unwanted
background noise is filtered out, only allowing the voice of
the other person to pass through the headset.
왘Press the button Ato switch the TalkThrough function
on. The LED <lights up. Press the button again to switch
TalkThrough off.

Using the headset
HMEC 26-2 | 15
Connecting a mobile telephone
The 2.5 mm jack socket 8allows you to connect a mobile
telephone. For this purpose, the NoiseGard™ active noise
compensation must be switched on and the microphone
connector must be connected to the aircraft radio/audio. A
suitable adapter for your mobile telephone with 2.5 mm jack
socket is available from your specialist retailer.
TalkThrough can only be used when the NoiseGard™
active noise compensation is switched on
.
CAUTION
Danger of accident due to reduced attention!
Making telephone calls or operating the mobile
telephone limits your attention and may cause
accidents.
왘During flight operation, do not use the headset
for telephone calls!
<
A
9

Using the headset
16 | HMEC 26-2
왘Connect the audio cable to the 2.5 mm jack socket 8on
the control unit I and to the corresponding jack socket on
your mobile telephone.
You can adjust the volume of the mobile telephone via the
headset’s control unit. However, the functions of the mobile
telephone cannot be controlled via the headset’s control
unit.
왘Operate your mobile telephone as usual and observe the
instructions of the manufacturer.
The latest list of compatible mobile telephones is available on
our website at www.sennheiser.com.
Connecting an additional audio player
The 3.5 mm jack socket 6allows you to connect and listen
to an audio player (not supplied) through the headset. For
this purpose, the NoiseGard™ active noise compensation
must be switched on.
CAUTION
Danger of accident due to reduced attention!
Listening to music or operating an audio device
limits your attention and may cause accidents.
왘During flight operation, do not use the headset
for listening to additional audio sources!

Using the headset
HMEC 26-2 | 17
왘Connect the audio cable to the 3.5 mm jack socket 6on
the control unit I and to the corresponding jack socket on
your audio player.
Attaching the belt clip
The belt clip allows you to attach the control unit to the seat
belt so that the control unit doesn’t hinder you.
왘Make sure not to squeeze any connection cable.
CAUTION
Hearing damage due to high volumes!
This headset is capable of producing high sound
pressure levels. Higher volumes or longer durations
can damage your hearing!
왘Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning
alarms.

Using the headset
18 | HMEC 26-2
Attaching the cable clip
The cable clip allows you to attach the headphone cable to
your clothing so that the cable doesn’t hinder or distract you.
왘Loop the cable through the clip so that the headphone
cable doesn‘t hinder you.

Care and maintenance
HMEC 26-2 | 19
Care and maintenance
Cleaning and maintaining the headset
왘Before cleaning, pull out the plugs of the product from the
connections in the aircraft.
왘Only use a soft, dry cloth to clean the product.
Replacing the ear pads
For reasons of hygiene, you should replace the ear pads
annually.
왘Grasp the edge of the ear pad and pull sharply.
왘Attach the new ear pad to the ear cup by pressing firmly
around the ear pad until you hear all 12 latches lock into
place.
CAUTION
Liquids can damage the product!
Liquids entering the product can short-circuit the electronics
or damage the mechanics. Solvents or cleansing agents can
damage the surface of the product.
왘Keep all liquids far away from the product.