Sony MDR-NC7 - Noise Canceling Headphones Manual

Sony MDR-NC7 - Noise Canceling Headphones Manual

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Sony MDR-NC7 - Noise Canceling Headphones Manual

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.

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. 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-flight music services.

Installing a battery

  1. Rotate the left housing as illustrated.
    Installing a battery - Step 1
  2. Push the OPEN button to open the battery lid.
  3. Insert one R03 (size AAA) battery by matching the on the battery to the in the battery case.
    Installing a battery - Step 2
  4. Close the lid.
    Installing a battery - Step 3

Battery life

Battery Approx. hours*1
Sony alkaline battery
50 hours*2
Sony manganese battery
25 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.

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 to replace the 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.

If the battery lid is detached

Attach it as illustrated.
Attach the battery lid

Listening to music

  1. Connect the headphones to the AV equipment.
    Listening to music - Step 1
    * "WALKMAN" and "WALKMAN" logo are registered trademarks of Sony Corporation.
  2. 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.
    Listening to music - Step 2
    The noise canceling microphone is built inside each earpad. Do not put weight or force on the microphone as it may damage the microphone.
  3. Wear the headphone marked on your right ear and the one marked on your left ear.
    Listening to music - Step 3
  4. Turn on the power of the AV equipment.

When using in an airplane

  • 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.

After listening to music

Turn off the power of the headphones.

Folding the headphones

Rotate the housings to make them flat for easy storage in the seat pocket.
Restore to their usual position before using.

Folding the headphones - Step 1

Fold the headphones as illustrated for easy storage in the carrying pouch (supplied).
Folding the headphones - Step 2


The headphones contain a noise canceling circuit.

What is noise canceling?

The noise canceling circuit actually senses outside noise with built-in microphones and sends an equalbut-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 finger 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.

Notes on usage

  • 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.

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.


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.

Power does not turn on

  • 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.



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-flight use*3 (single/dual) (1)

Operating Instructions (1) Card warranty (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-flight music services.

Design and specifications are subject to change without notice.

©2008 Sony Corporation Printed in Malaysia


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Documents / Resources

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Download Sony MDR-NC7 - Noise Canceling Headphones Manual


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