Sony MDR-NC50 Operating Instructions

Noise Canceling
headphones
Operating Instructions
MDR-NC50
© 2004 Sony Corporation
English
WARNING
To prevent fire or shock hazard, do
not expose the unit to rain or
moisture.
To avoid 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.
2-154-451-11 (1)
Printed in Korea
Owner's Record
The model number is located on the left inner side of
the headband. The serial number is located on the right
inner side of the headband.
Record these numbers in the spaces provided below.
Refer to them whenever you call upon your Sony dealer
regarding this product.
Model No. MDR-NC50
Serial No.
Features
• Noise-canceling headphones reduce ambient noise,
providing a quieter environment for enhanced
listening enjoyment.
The noise-canceling circuit achieves this with a
phase-cancellation process, providing a noise
reduction of over 14 dB at 300 Hz.
• Slim, folding design for easy portability.
• Neodymium magnets for powerful sound.
• Passive operation when noise-canceling circuit is not
activated.
• Built-in monitor function to hear surrounding sound
without taking off the headphones.
• Supplied plug adaptor for easy connectivity to stereo
or dual jack of in-flight music services.
Precautions
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 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.
• Mobile phones may cause noise. Keep the
headphones away from mobile phones.
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 listen with the headphones
while driving or cycling
As your headphones reduce outside sounds, it may
cause traffic accident. Also avoid using them where
hearing must not be impaired, for example, at a railroad
crossing, a site of construction, 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.
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.
Howling
• Make sure you are wearing the headphones correctly.

Specifications

General
Type Dynamic, closed
Driver units 40 mm, dome type
Power handling capacity
100 mW
40 Ω at 1 kHz
Impedance
(when the power is on)
100 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
DC 1.5 V, 1 × R03 (size AAA) battery
Power source
Mass Approx. 290 g (11 oz) including battery
Supplied accessories
Connecting cord (0.5 m, gold-plated stereo mini plug
(1) and 1.5 m, gold plated L type stereo mini plug (1)),
R03 (size AAA) dry battery (1), Carrying case (1), Plug
adaptor for in-flight use* (single/dual)(1), Gold-plated
unimatch plug adaptor (stereo phone plug y stereo
mini jack)(1), Operating Instructions (1)
* May not be compatible with some in-flight music
services.
Design and specifications are subject to change without
notice.