Sony MDR-NC40 Operating Instructions

Noise Canceling
Headphones
MDR-NC40
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.
Operating Instructions
Manual de instrucciones
3-282-466-33(1)
© 2008 Sony Corporation Printed in Malaysia
Battery life
Battery Approx. hours* 1
Sony alkaline battery LR03/ 40 hours* 2
AM-4 (N)
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
2
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.


Listening to music

1
Connect the headphones to the AV equipment.
When connecting to dual or
US
stereo mini jacks of in-flight
music services.
ES
Plug adaptor
(supplied)
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.
 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 / in) OFC litz cord
1
8
(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.
* Equivalent to approx. 90 % reduction of energy of sound
2
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.