Sony MDR-NC7 Manual

MDR-NC7 [US] 4-111-700-21 (1)

MDR-NC7

4-111-700-21 (1)

© 2008   Sony Corporation     Printed in Malaysia

Operating Instructions
Manual de instrucciones

(1)

Noise Canceling 
Headphones

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 modifi cations 
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. A microphone 
inside each earpad works with an electronic circuit 
to create an opposite sound wave to cancel out the 
noise. 

•  Foldable and swivel design for easy portability.
•  Dual use capability allows option to listen to music 

with or without noise cancellation.

•  Neodymium magnet delivers powerful sound.
•  Supplied plug adaptor for easy connectivity to 

stereo or dual jack for in-fl ight music services.

  Rotate the left housing as illustrated.  

 

  Push the OPEN button to open the battery 

lid.

 

  Insert one R03 (size AAA) battery by 

matching the e on the battery to the e  
in the battery case.

 

 

  Close the lid.

 

 hours∗

Sony alkaline battery 

50 hours*

2

LR03 SIZE AAA

Sony manganese battery 

25 hours*

2

R03 SIZE AAA

*

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.

Replace the battery with a new one when the 
POWER indicator dims. The noise canceling 
feature may not work correctly if battery power 
is low.

Attach it as illustrated.

+

_

®*, etc.

®*, etc.

The headphones contain a noise canceling circuit.

The noise canceling circuit actually senses outside 
noise with built-in microphones and sends an equal-
but-opposite canceling signal to the headphones.
• The noise canceling effect may not be pronounced 

in a very quiet environment, or some noise may be 
heard. In such a case, turn the POWER switch off.

• The noise canceling effect may vary depending on 

how you wear the headphones.

• When you turn the POWER switch on, the 

operation sound of the noise canceling may be 
noticeable. This is not a malfunction.

• The noise canceling function is only effective for 

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

• When you use the headphones in a train or a car, 

noise may occur depending on street conditions. 
In such a case, turn the POWER switch off.

• You can use the headphones without turning 

on the power. In this case, the noise canceling 
function is not active, and the headphones operate 
as passive headphones.

• Howling may occur if you do not wear the 

headphones correctly.

• Howling may occur if you place an object such as 

fi nger close to the noise canceling microphone. 
Keep it away from the microphone.

• 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.

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

may be distorted.

• Be sure to consult a Sony dealer when the 

earpads become dirty or damaged, or when the 
headphones require repair work.

• Do not leave the stereo headphones in a location 

subject to direct sunlight, heat or moisture.

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 traffi c 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.

•  Check if the battery has expired (the POWER 

indicator dims). Replace the battery with a new 
one.

•  Make sure you are wearing the headphones 

correctly.

General
Type Closed, 

dynamic

Driver unit 

30 mm, dome type (CCAW 
adopted)

Power handling capacity 

100 mW

Impedance 33 

Ω at 1 kHz 

(when the power is on)

 35 

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 

30 – 20,000 Hz

Total Noise Suppression Ratio*

1

Approx. 9 dB*

2

Cord 

Approx. 1.5 m (59 

1

/

8

 in) OFC 

litz cord

Power source 

DC 1.5 V, 1 

× R03 (size AAA) 

battery

Mass 

Approx. 134 g (4.7 oz) 
including battery

Supplied accessories
Sony R03 (size AAA) battery (1)
Carrying pouch (1)
Plug adaptor for in-fl ight use*

3

 (single/dual) (1)

Operating Instructions (1)

*

1

  Under the Sony measurement standard.

*

2

  Equivalent to approx. 87.4 % reduction of energy 

of sound compared with not wearing headphones.

*

3

  May not be compatible with some in-fl ight music 

services.

Design and specifi cations are subject to change 
without notice.

  Connect the headphones to the AV 

equipment.

*  “WALKMAN” and “WALKMAN” logo are 

registered trademarks of Sony Corporation.

  Turn on the power of the headphones.

 

The POWER indicator lights in red. 
When the power is turned on, ambient 
noise is reduced, and you can listen to 
music more clearly at a lower volume.

 

Note 
The noise canceling microphone is built inside each 
earpad. Do not put weight or force on the microphone 
as it may damage the microphone.

  Wear the headphone marked R on your 

right ear and the one marked L on your 
left ear.

 

  Turn on the power of the AV equipment.

•  The supplied plug adapter can be connected to the 

dual or stereo mini jacks in an airplane.

   
  for dual jacks 

•  Do not use the headphones when use of electronic 

equipment is prohibited or when use of personal 
headphones for in-fl ight 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.

Insert the E end 
fi rst.

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