HMEC 26-2
Instruction manual
Important safety information
Important safety information
왘 Please read this instruction manual carefully and
completely before using the product.
왘 Always include this instruction manual when passing the
product on to third parties.
왘 This instruction manual is also available on the Internet at
www.sennheiser-aviation.com or www.sennheiser.com.
Preventing health problems and accidents
왘 Always 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.
왘 Keep product, accessory and packaging parts out of reach
of children who could swallow smaller pieces.
왘 Switch 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.
왘 If 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.
왘 With 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
HMEC 26-2 | 1
Important safety information
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.
왘 The 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
왘 Always keep the product dry and do not expose it to
extreme temperatures (hairdryer, heater, extended
exposure to sunlight, etc.) to avoid corrosion or
deformation.
왘 Only clean the product with a soft, dry cloth.
왘 Never repair or attempt to repair a defective product
yourself. Contact your Sennheiser partner or the
Sennheiser Service Department.
왘 Only 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.
2 | HMEC 26-2
Important safety information
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.
HMEC 26-2 | 3
The HMEC 26-2 headset
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™ active noise compensation reduces ambient
noise by up to 18 dB – consequently the radio volume can
be decreased
• Lightweight
• Extremely comfortable to wear due to the patented twopiece 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
4 | HMEC 26-2
Package contents
• 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
1HMEC 26-2 headset
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*
1belt clip*
1 carry bag*
1 instruction manual
1 EASA Form 1
* not supplied with all product variants (see page 23)
HMEC 26-2 | 5
Operation
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.
6 | HMEC 26-2
Operation
Positioning the microphone
Bend the flexible microphone boom so that the microphone is
placed at the corner of the mouth. Maintain a distance of
2
cm 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.
HMEC 26-2 | 7
Operation
+
–
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.
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!
왘 Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning
alarms.
Adjusting the microphone sensitivity
Turn a small screwdriver in the direction of the arrow to
change the microphone sensitivity.
8 | HMEC 26-2
The control units of the HMEC 26-2
The control units of the HMEC 26-2
Control unit
Headset with
control unit I
Cable -BV-K-2
Cable -B-K-2
Cable -B-KP-2
Cable -B-CP-2
Cable -V-KX-2
I
1 Volume controls
2 LED
3 NoiseGard™ ON/OFF switch
4 Mono/stereo switch /
5 BOOM switch L/R
6 3.5 mm jack socket
7 Battery compartment
8 2.5 mm jack socket
Operating element
1 2 3 4 5 6 7 8
HMEC 26-2 | 9
The control units of the HMEC 26-2
Control unit
Headset with
control unit II
Cable -CP
Cable -CP-2
Cable -KP
Cable -KP-2
Cable -NP
Cable -RP-2
Cable -DP-2
II
2 LED
3 NoiseGard™ ON/OFF switch
Operating element
1 2 3 4 5 6 7 8
10 | HMEC 26-2
Using the headset
Using the headset
Switching NoiseGard™ on/off
The NoiseGard™ ON/OFF switch 3 allows you to switch the
NoiseGard™ active noise compensation on or off. With
NoiseGard™ switched off, the headset can be used as a
conventional headset.
왘 Set the NoiseGard™ ON/OFF switch 3 to the desired
position:
Position Function
ON NoiseGard™ is switched on.
The LED 2 lights 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 2 is off.
HMEC 26-2 | 11
Using the headset
Adjusting the volume
The two slide volume controls 1 allow you to adjust the
volume for the left and right channel separately.
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!
왘 Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning
alarms.
Switching between mono and stereo mode
The mono/stereo switch 4 allows 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 5 corresponds 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.
12 | HMEC 26-2
Using the headset
Powering NoiseGard™ via two (rechargeable) batteries
왘 Insert 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
page
hours. With NoiseGard™ switched on (see
11), the LED 2 provides information on the
remaining battery/rechargeable battery capacity:
LED 2
lights up yellow The battery capacity is sufficient.
lights up red The batteries are flat. Replace the batteries.
Meaning
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 shutoff” as follows:
HMEC 26-2 | 13
Using the headset
왘 Set 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
9 picks 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.
왘 Press the button A to switch the TalkThrough function
on. The LED
< lights up. Press the button again to switch
TalkThrough off.
14 | HMEC 26-2
Using the headset
<
A
9
TalkThrough can only be used when the NoiseGard™
active noise compensation is switched on
.
Connecting a mobile telephone
The 2.5 mm jack socket 8 allows 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.
CAUTION
Danger of accident due to reduced attention!
Making telephone calls or operating the mobile
telephone limits your attention and may cause
accidents.
왘 During flight operation, do not use the headset
for telephone calls!
HMEC 26-2 | 15
Using the headset
왘 Connect the audio cable to the 2.5 mm jack socket 8 on
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.
왘 Operate 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 6 allows you to connect and listen
to an audio player (not supplied) through the headset. For
this purpose, the
must be switched on
NoiseGard™ active noise compensation
.
CAUTION
Danger of accident due to reduced attention!
Listening to music or operating an audio device
limits your attention and may cause accidents.
왘 During flight operation, do not use the headset
for listening to additional audio sources!
16 | HMEC 26-2
Using the headset
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!
왘 Set the volume to a medium level. Make sure that
you can hear critical sounds such as warning
alarms.
왘 Connect the audio cable to the 3.5 mm jack socket 6 on
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.
왘 Make sure not to squeeze any connection cable.
HMEC 26-2 | 17
Using the headset
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.
왘 Loop the cable through the clip so that the headphone
cable doesn‘t hinder you.
18 | HMEC 26-2
Care and maintenance
Care and maintenance
Cleaning and maintaining the headset
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.
왘 Keep all liquids far away from the product.
왘 Before cleaning, pull out the plugs of the product from the
connections in the aircraft.
왘 Only use a soft, dry cloth to clean the product.
Replacing the ear pads
For reasons of hygiene, you should replace the ear pads
annually.
왘 Grasp the edge of the ear pad and pull sharply.
왘 Attach the new ear pad to the ear cup by pressing firmly
around the ear pad until you hear all 12 latches lock into
place.
HMEC 26-2 | 19
Care and maintenance
Replacing the headband paddings
For reasons of hygiene, you should replace the headband
paddings annually.
왘 Pull the Ziploc type fastening strips of the old headband
paddings apart. If necessary, use a pointed tool.
왘 Put the new headband paddings around the headbands.
왘 Attach the new headband paddings by joining the
fastenings strips.
20 | HMEC 26-2
Accessories and spare parts
Accessories and spare parts
By changing the cables, you can simply retrofit different
control units (see page
23) to your headset.
Accessories
• Cable -CP Cat. No. 500852
•Cable -CP-2 Cat. No. 505684
•Cable -KP Cat. No. 500842
•Cable -KP-2 Cat. No. 505686
•Cable -NP Cat. No. 500855
•Cable -RP-2 Cat. No. 505687
•Cable -DP-2 Cat. No. 505685
•Cable -BV-K-2 Cat. No. 505683
• Cable -B-K-2 Cat. No. 505690
• Cable -B-KP-2 Cat. No. 505682
•Cable -B-CP-2 Cat. No. 505689
•Cable -V-KX-2 Cat. No. 505688
• Hygiene pads HZH 26, Cat. No. 502595
white, 200 pairs
• Hygiene pads HZH 26, Cat. No. 504062
black, 200 pairs
9 and 10) or connectors (see page
HMEC 26-2 | 21
Accessories and spare parts
Spare parts
• Audio cable, length 0.6 m,
2 x 3.5 mm stereo jack plug
• Audio cable, length 0.6 m,
2 x 2.5 mm jack plug
• Ear pads, leatherette, 1 pair
• Ear pads, leatherette, 100 pairs
• Wind and pop screen, 1 item
• Wind and pop screen, any number of items
•Carry bag
• Headband paddings, 1 pair
•Belt clip
• Cable clip HZC 08
Cable clip
HZC 08 (for round cables)
22 | HMEC 26-2
Product and cable variants
Product and cable variants
The following cables, connectors, control units and features
are available for the HMEC 26-2 variants (see table on the
following pages):
1 Headphhones with +6 dB characteristic SPL
2 Microphone with 60 mV output voltage
3 Single-sided round cable, 1.7 m
4 XLR-5 connector
5 ¼“ (6.3 mm) jack plug (headphones)
6 PJ-068 equivalent (microphone)
7 8-pin Neutricon connector
8 6-pin Redel connector
9 XLR-6 connector
< XLR-3 connector
A Aircraft powered
B Battery powered
C Control unit I (see page 9)
D Control unit II (see page 10)
E Audio cable (1 cable with 2.5 mm jack plugs and
1 cable with 3.5 mm jack plugs)
F Belt clip
G Carry bag
HMEC 26-2 | 23
Product and cable variants
Model Cat. No. Part Number
HMEC 26-2 505671 026-35-2
HMEC 26-2-1 505672 026-30-2
HMEC 26-2-T 505680 026-C0-2
HMEC 26-2-CP 505676 026-35-2-999-3211
HMEC 26-2-1-CP-2* 505677 026-30-2-999-32C1
HMEC 26-2-KP 505678 026-35-2-999-3111
HMEC 26-2-1-KP-2* 505679 026-30-2-999-31C1
HMEC 26-2-1-B-K-2* 505674 026-30-2-999-11G1
HMEC 26-2-1-BV-K-2* 505675 026-30-2-999-11E1
HMEC 26-2-B-CP-2 505671 + 505689 026-35-2-999-22G1
HMEC 26-2-1-B-CP-2* 505672 + 505689 026-30-2-999-22G1
HMEC 26-2-V-KX-2 505671 + 505688 026-35-2-999-41D1
HMEC 26-2-1-V-KX-2* 505672 + 505688 026-30-2-999-41D1
HMEC 26-2-DP-2 505671 + 505685 026-35-2-999-3BC1
HMEC 26-2-1-DP-2* 505672 + 505685 026-30-2-999-3BC1
HMEC 26-2-NP 505671 + 500855 026-35-2-999-3811
HMEC 26-2-1-NP* 505672 + 500855 026-30-2-999-3811
HMEC 26-2-B-KP-2 505671 + 505682 026-35-2-999-2192
HMEC 26-2-1-B-KP-2* 505672 + 505682 026-30-2-999-2192
HMEC 26-2-RP-2 505671 + 505687 026-35-2-999-36C1
HMEC 26-2-1-RP-2* 505672 + 505687 026-30-2-999-36C1
* Each -2-1 model is also available as a 2-T model (headphones
with +6 dB characteristic SPL and microphone with
60 mV output voltage)
24 | HMEC 26-2
Product and cable variants
1 2 3 4 5 6 7 8 9 < A B C D E F G
These headsets can be combined with all
cables (see page 21)
HMEC 26-2 | 25
Specifications
Specifications
Headphones
Transducer principle dynamic, closed
Ear coupling supra-aural
Frequency response 20 - 14,000 Hz
Impedance HMEC 26-2:
Characteristic SPL HMEC 26-2:
Max. SPL 120 dB SPL at 1 kHz
Active noise
compensation
THD < 1 % at 1 kHz, 95 dB SPL
Contact pressure approx. 3.6 N
600 Ω mono/1,200 Ω stereo
HMEC 26-2 with -2 cables:
350 Ω mono/600 Ω stereo
92 dB SPL at 1 kHz, 1 mW, mono
95 dB SPL at 1 kHz, 1 V
HMEC 26-2 with -2 cables:
95 dB SPL at 1 kHz, 1 mW, mono
100 dB SPL at 1 kHz, 1 V
≥ 18 dB (100 - 300 Hz)
26 | HMEC 26-2
Specifications
Microphone
incl. preamplifier
Type HMEC 26-2: BKE 46
HMEC 26-2-1/T: BKE 46-1
Transducer principle pre-polarized condenser microphone,
noise-compensating
Frequency response 100 - 6,000 Hz
Output voltage adjustable from 17-100 mV/Pa
HMEC 26-2: 80 mV/Pa –2 dB
factory preset: =
HMEC 26-2-1/T: 60 mV/Pa ±1 dB
factory preset: =
Terminating impedance 150 - 2,200 Ω
Supply voltage 8 - 16 V DC
General data
Temperature range operation: –15 °C to 55 °C
storage: –55 °C to 70 °C
Weight without cable approx. 210 g
Cable length approx. 1.70 m
Power supply for
NoiseGard™ professional
via AA size battery (IEC LR 6) with approx.
60 hrs operating time:
2 x 1.5 V alkaline battery
2 x 1.2 V rechargeable battery
via aircraft DC power supply system:
12 - 35 V DC , max. 35 mA
800 mV –2 dB at 114 dB SPL
600 mV ±1 dB at 114 dB SPL
HMEC 26-2 | 27
Connector assignment
¼" (6.3 mm)
jack plug
PJ-068
equivalent
1
2
3
Audio Hi left
Audio Hi right
Audio Lo
1
2
3
not assigned
Microphone Hi
Microphone Lo
12 3
12 3
XLR-3 connector
1
2
3
NoiseGard
TM
(DC+)
DC–
not assigned
13 2
Connector assignment
Cable -V-KX-2
Cable -CP, -CP-2, -B-CP-2
Solder side
1
Audio Hi
4
2
Audio Lo / DC–
3
Microphone Hi
5
Microphone Lo
4
NoiseGard
5
1 Audio Hi
2 Audio Lo
3 not assigned
4 Microphone Lo
5 Microphone Hi
6 not assigned
7 DC–
8 NoiseGard
TM
TM
1
Cable -NP
Solder side
3
2
(DC+)
(DC+)
28 | HMEC 26-2
Connector assignment
Solder side
1
NoiseGard
TM
(DC+)
2
DC–
3
Audio Lo
4
Audio Hi
5
Microphone Hi
6
Microphone Lo
1
3
2
6
4
5
¼" (6.3 mm) jack plug PJ-068 equivalent
12 3
12 3
Cable -RP-2
Solder side
1
2
3
1 NoiseGard
6
2 Audio Lo / DC–
3 Audio Hi left
5
4 Audio Hi right
4
5 Microphone Hi
6 Microphone Lo
TM
(DC+)
Cable -DP-2
Cable -KP, -KP-2, -B-K-2, -B-KP-2, -BV-K-2
Cable -KP / -KP-2 / -B-KP-2
1Audio Hi 1NoiseGard™ (DC+)
2 not assigned 2 Microphone Hi
3 Audio Lo / DC– 3 Microphone Lo
Cable -B-K-2
1 Audio Hi 1 not assigned
2 not assigned 2 Microphone Hi
3 Audio Lo 3 Microphone Lo
Cable -BV-K-2
1 Audio Hi left 1 not assigned
2Audio Hi right 2Microphone Hi
3 Audio Lo 3 Microphone Lo
HMEC 26-2 | 29
Manufacturer Declarations
Manufacturer Declarations
Warranty
Sennheiser GmbH & Co. KG gives a warranty of 5 years on this
product. For the current warranty conditions, please visit our
website at www.sennheiser-aviation.com or
www.sennheiser.com or contact your Sennheiser partner.
In compliance with the following requirements
• RoHS Directive (2002/95/EC)
CE Declaration of Conformity
• EMC Directive (2004/108/EC)
The declaration is available at www.sennheiser.com.
In compliance with:
Europe EMC EN 55103-1/-2
China
Warenzeichen
Sennheiser and NoiseGardTM professional are registered
trademarks of Sennheiser electronic GmbH & Co. KG.
Other product and company names mentioned in this
instruction manual may be the trademarks or registered
trademarks of their respective owners.
30 | HMEC 26-2
Sennheiser electronic GmbH & Co. KG
Am Labor 1, 30900 Wedemark, Germany
www.sennheiser-aviation.com | www.sennheiser.com
Printed in Germany, Publ. 08/12, 548043/A01
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