Noise Canceling
Headphones
Operating Instructions
Manual de instrucciones
MDR-NC40
© 2008 Sony Corporation Printed in Malaysia
English
Battery life
Listening to music
1 Connect the headphones to the AV equipment.
When connecting to dual or stereo mini jacks of
Plug adaptor 
(supplied)To headphone jacks on airplane seatsWhen 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.
•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 |
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. |
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).
| Battery | Approx. hours*1 | |
Sony alkaline battery LR03/ | 40 hours*2 | |
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| |
|
| |
Sony battery | 20 hours*2 | |
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*1 | 1 kHz, 0.1 mW + 0.1 mW output |
|
*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.
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
2 Wear the headphones marked R in your right ear and the one marked L 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.
• 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. |
Notes on headphones
Preventing hearing damageAvoid 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.
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.
Clawsm
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.
4 Start playing on the AV equipment.
*“WALKMAN” and “WALKMAN” logo are registered trademarks of Sony Corporation.
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 buttonWhen 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
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 |
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.
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 - 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
2 Insert one R03 (size AAA) battery, matching the e on the battery to the e in the battery compartment.
m
Insert the E end first.3 Close the lid.
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.