Sony MDR NC20 User Manual

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© 1996  Sony Corporation     Printed in China

3-810-317-14(1)

Operating Instructions

Manual de instrucciones

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 model number is located at the rear side of the
battery box.
The serial number is located at the both sides of the
head band.
Record these numbers in the spaces provided below.
Refer to them whenever you call upon your Sony
dealer regarding this product.

Model No. MDR-NC20 
Serial No. 

• Noise canceling headphones reduce ambient noise,

and provide a quieter environment to enhance audio
entertainment.  Ambient sound is synthesized with
an anti-sound signal produced by the noise
canceling circuit, and reduced. (Over 10 dB is
reduced at 300 Hz.)

• Compact  folding Style
• Neodymium magnets are used to deliver powerful

sound.

• Operates as passive headphone when noise

canceling circuit is not activated.

• Plug adaptor is supplied to connect directly to stereo

or dual jack of inflight music services.

• Plug types are compatible with Sony WALKMAN*

remote controllers and stereo mini jacks of audio
and visual equipment.

* WALKMAN is a trademark of Sony Corporation.

Open the lid of the battery box on the right outer
side of the headphone.

Insert one R03 (size AAA) battery by matching the
+ and – on the battery to the + and – in the battery
box.

Close the lid.

Replace the battery with a new one when the POWER
indicator dims.

Sony alkaline LR03 (size
AAA) battery
Sony R03 (size AAA) battery

40 hours

20 hours

Connect the headphones to the AV equipment.

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.

Put on the headphones so that the ear pads cover
your ears.

Turn on the power of the AV equipment.

• The supplied plug adaptor can be connected to dual

and stereo mini jacks.

• Do not use the headphones when use of electronic

equipment is prohibited or when use of personal
headphones for inflight 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.

• 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.

• The noise canceling function may not work properly

unless the headphones are put on firmly.

• 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.

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

be distorted.

• Be sure to bring the headphones to a Sony dealer

when requiring a change of ear pads or repair work.

• The CE mark on the unit is valid only for products

marketed in the European Union.

• Do not leave the stereo headphones in a location

subject to direct sunlight, heat or moisture.

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.

As your headphones reduce outside sounds, it may
cause traffic accident. Also avoid using them where
hearing must not be impaired, for example, a railroad
crossing, a site of construction, 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.

• Turn down the volume of the connected AV

equipment.

• Replace the battery.

General
Type

Dynamic, closed

Driver units

30 mm dia: dome type

Impedance

24 ohms at 1 kHz
(when the power is on)
56 ohms 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

16 – 22,000 Hz

Frequency range of active noise attenuation

40 – 1,500 Hz more than 10 dB at
300 Hz

Input cord

0.5 m  cord with a gold-plated
microplug

Power source

DC 1.5 V, 1 

×

 R03 (size AAA) battery

Mass

Approx. 175 g  (6.2 oz) including
battery

Supplied accessories
Connecting cord 1m (39 

3

/

8

 in.) (a gold-plated micro

jack 

t a gold-plated L shaped stereo mini plug) (1)

Plug adaptor for in-flight use (single/dual) (1)
Carrying case (1)
Operating instructions (1)

Design and specifications are subject to change
without notice.