Sony MDR-NC40 User Manual

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1

1 kHz, 0.1 mW + 0.1 mW output

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2

Time stated above may vary, depending on the temperature
or conditions of use.

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.

Power indicator dims, and the noise canceling function is
deactivated. Replace the battery with a new one in this 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.

• 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.

You can fasten the battery box by its clip on a shirt pocket.

• 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.

• Be careful not to catch your finger as you fold the

headphones.

• Clean the headphones with a soft dry cloth.
• Do not leave the jack plug dirty otherwise the sound may

be distorted.

• 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.
• If you fell drowsy or sick while using these headphones,

stop use immediately.

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.

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.

• 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.

• Turn down the volume of the connected AV equipment.
• Replace the battery.

Type

Closed, dynamic

Driver unit

30 mm, dome type (CCAW adopted)

Power handling capacity

50 mW

Impedance

68 

Ω at 1 kHz (when the power is on)

30 

Ω at 1 kHz (when the power is off)

Sensitivity

102 dB/mW (when the power is on)
100 dB/mW (when the power is off)

Frequency response

14 - 22,000 Hz

Frequency range of active noise attenuation

40 – 1,500 Hz more than 14 dB at
300 Hz

Cord

Approx. 1.5 m (59 

1

/

8

 in) OFC litz cord

(including battery box)

Power source

DC 1.5 V, 1 

× R03 (size AAA) battery

Mass

Approx. 110 g (3.9 oz) including battery
box, cord, and battery
Approx. 80 g (2.9 oz) not including
battery box, cord, and battery

Sony R03 (size AAA) battery (1)
Carrying case (1)
Plug adaptor for in-flight use* (single/dual) (1)
Operating Instructions (1)

* May not be compatible with some in-flight music services.

Design and specifications are subject to change without
notice.

Connect the headphones to the AV equipment.

Wear the headphones marked R in your right
ear and the one marked L in your left ear.

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.

Start playing on the AV equipment.

* “WALKMAN” and “WALKMAN” logo are registered

trademarks of Sony Corporation.

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.

• The supplied plug adapter can be connected to the dual or

stereo mini jacks in an airplane.

             

• 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.

If you have any questions or problems concerning the
system that are not covered in this manual, please consult
the nearest Sony dealer.

Turn off the power of the headphones.

• The noise canceling function is only effective for noise in the

low frequency band. Although noise is reduced, it is not
canceled completely.

• Do not cover the microphone of the headphones with your

hands. The noise canceling function may not work properly.

• The noise canceling function may not work properly unless

the headphones are put on firmly.

• 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.

MDR-NC40

3-282-466-31 (2)

© 2008   Sony Corporation     Printed in Malaysia

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.

You are cautioned that any changes or modifications not
expressly approved in this manual could void your authority
to operate this equipment.

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).

• Noise canceling headphones reduce unwanted ambient

noise, providing a quieter environment to enhance your
listening experience.

• 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.

Push and slide the compartment lid on the rear
of the battery box fully, and open.
Before opening the compartment lid, check that
the claws of the lid are seen.

m

Insert one R03 (size AAA) battery, matching the e
on the battery to the e in the battery compartment.

Close the lid.

Operating Instructions
Manual de instrucciones

*

*

Insert the E end first.

Sony alkaline battery LR03/
AM-4 (N)

Sony battery R03/UM-4 (NU)

40 hours*

2

20 hours*

2

,

,

m