Sony MDR-NC40 User Manual

Noise canceling headphones, Unfolding the headphones, Using the clip

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Battery life

Battery

Approx. hours

*

1

Sony alkaline battery LR03/

AM-4 (N)

40 hours*

2

Sony battery R03/UM-4 (NU)

20 hours*

2

*

1

1 kHz, 0.1 mW + 0.1 mW output

*

2

Time stated above may vary, depending on the temperature or

conditions of 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.

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.

Unfolding the

headphones

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.

 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.

Using the clip

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

Clip

Precautions

 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.

 If headphone sound is noisy, move the battery box away

from sources of interference, such as a radio, etc.

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.

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.

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.

Muffled sound

 Turn down the volume of the connected AV equipment.

 Replace the battery.

The sound of the connected source device, such as

radio and TV, cannot be heard, or headphone

sound is noisy.

 Move the battery box away from the connected source

device.

Specifications

General

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 Hz - 22,000 Hz

Total Noise Suppression Ratio*

1

Approx. 10 dB*

2

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

Supplied accessories

Sony R03 (size AAA) battery (1)

Carrying case (1)

Plug adaptor for in-flight use*

3

(single/dual) (1)

Operating Instructions (1)

*

1

Under the Sony measurement standard.

*

2

Equivalent to approx. 90 % reduction of energy of sound

compared with not wearing headphones.

*

3

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

Design and specifications are subject to change without

notice.

“WALKMAN” and “WALKMAN” logo are registered

trademarks of Sony Corporation.

Listening to music

1

Connect the headphones to the AV equipment.

Plug adaptor

(supplied)

When connecting to dual or

stereo mini jacks of in-flight

music services.

To headphone jacks on

airplane seats

When directly connecting to the

headphone jack (stereo mini

jack) of a “WALKMAN”, etc.

When connecting to a remote

commander with a stereo mini

jack of a “WALKMAN”, etc.

Remote commander

2

Wear the headphones marked  in your right

ear and the one marked  in your left ear.

3

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.

Power indicator

Power switch

4

Start playing on the AV equipment.

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.

MONITOR button

When using in an airplane

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

stereo mini jacks in an airplane.

dual jacks

stereo mini jacks

 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.

After use

Turn off the power of the headphones.
Notes

 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.

Microphone

 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.

 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.

English

Noise Canceling Headphones

WARNING

To reduce the risk of fire or electric shock, do not

expose this apparatus to rain or moisture.

To reduce the risk of electrical shock, do not open

the cabinet. Refer servicing to qualified personnel

only.

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).

Features

 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.

Installing a battery

1

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.

Claws

2

Insert one R03 (size AAA) battery, matching the

 on the battery to the  in the battery

compartment.

Insert the end first.

3

Close the lid.

3-282-466-33(1)

Noise Canceling

Headphones

MDR-NC40

© 2008 Sony Corporation Printed in Malaysia

Operating Instructions

US

Manual de instrucciones

ES

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