• In a quiet place, or depending on certain noises, you may feel
that the noise canceling function is not effective, or that noise
is accentuated. In this case, turn off the power of the
headphones.
• Mobile phones may cause interference and noise. To avoid
interference, use noise canceling feature only with wireless
transmitters turned off (Airplane Mode). Interference noise
can also occur from nearby mobile phones. Should this occur,
locate the headphones further away from the mobile phone.
3-282-466-31 (2)
Listening to music
1
Connect the headphones to the AV equipment.
Noise Canceling
Headphones
When connecting to dual or
stereo mini jacks of in-flight
music services.
Plug adaptor
(supplied)
Using the clip
Operating Instructions
You can fasten the battery box by its clip on a shirt pocket.
Manual de instrucciones
To headphone jacks
on airplane seats
Clip
When directly connecting to
the headphone jack (stereo
mini jack) of a WALKMAN *,
etc.
Precautions
MDR-NC40
© 2008 Sony Corporation Printed in Malaysia
• Do not put weight or pressure on the headphones as it
may cause the headphones to deform during long storage.
• The earpads may deteriorate due to long-term storage or
use.
When connecting to a remote
commander with a stereo
mini jack of a WALKMAN *,
etc.
• Be careful not to catch your finger as you fold the
headphones.
English
• Clean the headphones with a soft dry cloth.
• Do not leave the jack plug dirty otherwise the sound may
be distorted.
Battery life
• Be sure to bring the headphones to the Sony dealer when
requiring a change of earpads or repair work.
• Do not leave the headphones in a location subject to direct
sunlight, heat or moisture.
• Do not subject the headphones to excessive shock.
• Handle the driver units carefully.
Remote commander
Battery
Approx. hours*1
40 hours*2
WARNING
Sony alkaline battery LR03/
AM-4 (N)
To reduce the risk of fire or electric
shock, do not expose this apparatus to
rain or moisture.
2
3
Wear the headphones marked R in your right
ear and the one marked L in your left ear.
Sony battery R03/UM-4 (NU)
20 hours*2
1
*
*
1 kHz, 0.1 mW + 0.1 mW output
Time stated above may vary, depending on the temperature
or conditions of use.
• If you fell drowsy or sick while using these headphones,
stop use immediately.
2
To reduce the risk of electrical shock, do
not open the cabinet. Refer servicing to
qualified personnel only.
Notes on headphones
Preventing hearing damage
Avoid using headphones at high volume. Hearing experts
advise against continuous, loud and extended play. If you
experience a ringing in your ears, reduce the volume or
discontinue use.
Note
Because the supplied battery was included in the package from
the time of manufacture (as a convenience to the user), it is
possible that the battery life may be somewhat depleted by the
time of purchase. The actual life of the supplied battery may be
shorter than the standard time described in this manual when
using a fresh battery.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.
Turn on the power of the headphones.
The power indicator lights in red. The power
switch is located on the battery box. When
power is turned on, ambient noise is reduced,
and you can listen to music more clearly at a
lower volume.
Do not use headphones while driving and cycling,
etc.
As headphones reduce outside sounds, they may cause a
traffic accident. Also, avoid listening with your headphones
in situations where hearing must not be impaired, for
example, a railroad crossing, a construction site, etc.
You are cautioned that any changes or modifications not
expressly approved in this manual could void your authority
to operate this equipment.
When the battery is low
Power indicator dims, and the noise canceling function is
deactivated. Replace the battery with a new one in this case.
The validity of the CE marking is restricted to only those
countries where it is legally enforced, mainly in the
countries EEA (European Economic Area).
Unfolding the
headphones
Troubleshooting
No sound
• Check the connection of the headphones and the AV
equipment.
• Check that the connected AV equipment is turned on.
• Turn up the volume of the connected AV equipment.
• Replace the battery.
Features
Power indicator
Power switch
• Noise canceling headphones reduce unwanted ambient
noise, providing a quieter environment to enhance your
listening experience.
4
Start playing on the AV equipment.
,
,
• Lightweight design (less than 3 oz. for headphones
portion) reduces stress on head.
• Soft and comfortable fit from pressure-relieving urethane
ear cushion.
• Compact, folding design convenient for travel use.
• Compact battery box with monitor function to silence the
audio and listen outside.
* “WALKMAN” and “WALKMAN” logo are registered
trademarks of Sony Corporation.
Muffled sound
• Turn down the volume of the connected AV equipment.
• Replace the battery.
To hear ambient sound for safety
When the power switch is set to on, noise canceling can be
deactivated while the MONITOR button is pressed so that
you can hear ambient sound.
Specifications
General
Installing a battery
Type
Closed, dynamic
1
Push and slide the compartment lid on the rear
of the battery box fully, and open.
Driver unit
30 mm, dome type (CCAW adopted)
MONITOR button
Power handling capacity
50 mW
Before opening the compartment lid, check that
the claws of the lid are seen.
When using in an airplane
• The supplied plug adapter can be connected to the dual or
stereo mini jacks in an airplane.
Impedance
68 Ω at 1 kHz (when the power is on)
30 Ω at 1 kHz (when the power is off)
102 dB/mW (when the power is on)
100 dB/mW (when the power is off)
Sensitivity
Storing the headphones in the carrying
case
When storing the headphones in the supplied carrying case,
set the inner partition up, fold the headphones and store.
The plug adaptor and reserve battery can also be stored in
the pockets of the carrying case.
Frequency response
14 - 22,000 Hz
Frequency range of active noise attenuation
40 – 1,500 Hz more than 14 dB at
300 Hz
dual jacks
stereo mini jacks
Cord
Approx. 1.5 m (59 1/8 in) OFC litz cord
(including battery box)
• Do not use the headphones when use of electronic
equipment is prohibited or when use of personal
headphones for in-flight music services is prohibited.
Power source
Mass
DC 1.5 V, 1 × R03 (size AAA) battery
Approx. 110 g (3.9 oz) including battery
box, cord, and battery
Claws
If you have any questions or problems concerning the
system that are not covered in this manual, please consult
the nearest Sony dealer.
Approx. 80 g (2.9 oz) not including
battery box, cord, and battery
m
Supplied accessories
Sony R03 (size AAA) battery (1)
After use
Turn off the power of the headphones.
Carrying case (1)
Plug adaptor for in-flight use* (single/dual) (1)
Operating Instructions (1)
Notes
• The noise canceling function is only effective for noise in the
low frequency band. Although noise is reduced, it is not
canceled completely.
* May not be compatible with some in-flight music services.
• Do not cover the microphone of the headphones with your
hands. The noise canceling function may not work properly.
Design and specifications are subject to change without
notice.
2
3
Insert one R03 (size AAA) battery, matching the e
on the battery to the e in the battery compartment.
Microphone
m
Insert the E end first.
• The noise canceling function may not work properly unless
the headphones are put on firmly.
Close the lid.
• You can use the headphones even without turning on the
power. In this case, the noise canceling function is not active,
and the headphones operate as passive headphones.
• After you turn on the power of the headphones, you may hear
a slight hiss. This is the operating sound of the noise canceling
function, not a malfunction.
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