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Operating Instructions
Wireless Stereo
Headphone System
MDR-RF925RK
MDR-RF970RK
©2009 Sony Corporation
Printed in China
English
Welcome!
Thank you for purchasing the Sony MDR-RF925RK/
RF970RK Wireless Stereo Headphone System. Before
operating the unit, please read this manual thoroughly
and retain it for future reference.
WARNING
Some features are:
• Wireless headphone system with automatic
recharging function
To reduce the risk of fire or electric shock,
• Automatic tuning on headphones for the best
do not expose this apparatus to rain or
reception of signal (MDR-RF970RK only)
moisture.
• Easy connection with TV, Audio and PC equipment
• Up to 45 meters reception range
To reduce the risk of the fire or electric shock, do not
• Playback time of 22hrs (MDR-RF970RK), or 28hrs
expose this apparatus to dripping or splashing, and
(MDR-RF925RK) with Sony alkaline battery (not
do not place objects filled with liquids, such as vases,
supplied)
on the apparatus.
• Playback time of 14hrs (MDR-RF970RK), or 18hrs
To avoid electrical shock, do not open the cabinet.
(MDR-RF925RK) with Ni-MH rechargeable battery
Refer servicing to qualified personnel only.
(supplied)
As the main plug of AC power adaptor is used to
• Battery is automatically charged by placing the
disconnect the AC power adaptor from the mains,
headphones on the transmitter
connect it to an easily accessible AC outlet.
• Automatic ON/OFF function on headphones to
Should you notice an abnormality in it, disconnect it
preserve battery life
from the AC outlet immediately.
• Free adjustable headband for precise and
Do not install the appliance in a confined space, such
comfortable fit
as a bookcase or built-in cabinet.
• Volume control function on the headphones
Do not expose the battery to excessive heat such as
• 3 transmission channels available
direct sunlight, fire or the like.
Notes on receiving
performance
This system utilizes very high frequency signals in the
900 MHz band so the receiving performance may
deteriorate due to the surroundings. The following
examples illustrate conditions that may reduce the
reception range or cause interference.
• Inside a building with walls containing steel beams.
• An area with many steel file cabinets, etc.
• An area with many electrical appliances capable of
generating electromagnetic fields.
• The transmitter is placed on a metal instrument.
• An area facing a roadway.
• Noise or interfering signals exist in the surroundings
due to radio transceivers in trucks, etc.
• Noise or interfering signals exist in the surroundings
owing to wireless communication systems installed
along roadways.
4-146-201-11(1)
5
N Getting started
Unpacking
Check that you have the following items:
• The headphones (1)
• The transmitter (1)
• AC power adaptor (1)
About the charging method of the system
This system employs a contactless charge method that
requires no terminals by the electromagnetic induction.
• Connecting cord (1) (phono plugs y stereo
miniplug), 1 m
Notes
• Do not leave any metallic objects (coin, clip, etc.) near
the transmitter's charging point. The transmitter and
the metal might become hot and it is dangerous.
• Unimatch plug adaptor (1) (stereo mini jack y
stereo phone plug) (MDR-RF970RK only)
• Do not leave any objects susceptible to magnetism
(cash cards, floppy disks with magnetic coding, etc.)
• Rechargeable nickel-metal hydride battery
near the system. Exposure to the transmitter's
BP-HP550-11 (1)
electromagnetic field may render them unusable.
Charging the supplied
rechargeable battery
The supplied rechargeable nickel-metal hydride battery
is not charged from the first time you use it. Be sure to
charge it before use.
• Do not place a radio near the system. A noise may be heard
To charge the headphones, place them on the transmitter.
from the radio. In such a case, change the angle of the radio
1
or move away from the system so that a noise is not heard.
Press the PUSH button of the left housing to
open the battery compartment lid.
When the transmitter's POWER/CHARGE
The battery compartment lid comes off.
indicator does not light up red
L
Check if the right and left headphones are rested on
the transmitter correctly. Remove the headphones and
replace them on the transmitter again so that the
POWER/CHARGE indicator lights in red.
To recharge the headphone battery after use
Place the headphones on the transmitter after use.
PUSH
Since the built-in timer recognizes when charging is
button
complete, there is no need to remove the headphones
from the transmitter after charging.
2
Insert the supplied rechargeable nickel-
Notes
metal hydride battery into the battery
• About 16 hours after the beginning of every battery
compartment matching the 3 terminal on
the battery to the 3 mark in the
compartment.
Do not use rechargeable battery other than the
• Even after repeated charge, the battery is durable
supplied one.
• The transmitter automatically stops sending RF
• This system is designed to charge only the supplied
• If dry batteries are installed, they cannot be charged.
• Do not attempt to use the supplied BP-HP550-11
3
• Charge in an environmental temperature of
Close the battery compartment lid.
1Insert the tab into the hole at the upper left.
2Close the lid until it clicks.
Charging and usage hours
L
Approx. charging
1
hours*
1 hour
16 hours*
*
1
2
*
2
3
*
4
Connect the supplied AC power adaptor to
Using the headphones with dry batteries
the transmitter.
(sold separately)
Commercially available (size AAA) dry batteries can also
be used to power the headphones. Install the batteries in
the same manner as described in steps 1 through 3 of
"Charging the supplied rechargeable battery."
When dry batteries are installed, the battery charge
1 2
3
R
A
L INPUT
B
CHANNEL
DC IN 12V
function will not be activated.
Transmitter
To DC IN
Battery life
12V jack
To an AC
(Using Sony alkaline batteries LR03/AM-4 (N))
outlet
Model
MDR-RF925RK
AC power adaptor
MDR-RF970RK
(supplied)
*
1
*
2
Notes on Batteries
Rest the headphones on the transmitter so
• Do not charge a dry battery.
that the transmitter's POWER/CHARGE
• Do not carry a dry battery together with coins or
indicator lights in red.
other metallic objects. It can generate heat if the
Please place the headphones on the transmitter so that
positive and negative terminals of the battery
the triangle arrow would be matched. If the headphones
accidentally come into contact with metallic objects.
• If you are not going to use the unit for a long time,
are not properly placed, it will not be charged.
remove the batteries to avoid damage from battery
Charging will take about 16 hours, after which the
leakage or corrosion.
POWER/CHARGE indicator will go off.
Headphones
Checking the remaining battery power
Pull up the self-adjusting band and check the POWER
L
R
indicator located on the right housing. The battery is
still serviceable when the indicator lights in red.
Charge the rechargeable battery or install new dry
batteries if the POWER indicator light dims, flashes, or
the sound becomes distorted or noisy.
Note
The rechargeable nickel-metal hydride battery should
be replaced with new one when they last only half the
expected time after a proper recharging. The
rechargeable battery type BP-HP550-11 is not
commercially available. You can order the battery
from the store where you purchased this system, or at
Transmitter
POWER/CHARGE
your nearest Sony dealer.
indicator
Setting up the transmitter
1
Connect the transmitter to audio/video
equipment.
Select one of the hookups below depending on the
jack type:
A To connect to a headphones jack
Charging point
Transmitter
1 2
3
R
A
L
INPUT
CHANNEL
DC IN 12V
L
R
Right
Left channel
Headphones
channel (red)
(white)
Connecting cord
Rechargeable
(supplied)
battery
Lines of magnetic
force
Transmitter
Unimatch plug
adaptor
(MDR-RF970RK:
supplied)
To headphones
jack (Stereo
phone jack)
B To connect to LINE OUT or REC OUT
Transmitter
charge, the charging ends and the transmitter's
POWER/CHARGE indicator lights off, regardless of
the battery level. This is the automatic control by the
timer in the transmitter.
1 2
3
R
A
L
INPUT
CHANNEL
DC IN 12V
for use, because the unit is designed with the low
electrical current system for charging the battery.
signals while charging the battery.
rechargeable battery type BP-HP550-11 for safety.
Note that other types of rechargeable batteries
cannot be charged with this system.
Connecting cord
(supplied)
rechargeable battery for other components. They are
for use with this system only.
Right
channel (red)
between 0 °C and 40 °C (between 32 °F and 104 °F).
To LINE OUT or
Approx. usage time*
1
REC OUT jacks
1
MDR-RF925RK MDR-RF970RK
60 minutes*
3
40 minutes*
3
Stereo system,
2
18 hours*
3
14 hours*
3
VCR, etc.
at 1 kHz, 1 mW+1 mW output
* "WALKMAN" and "WALKMAN" logo are
hours required to fully charge an empty battery
registered trademarks of Sony Corporation.
Time stated above may vary, depending on the
temperature or conditions of use.
Note
Refer to documentations of a connected component
for details about the specifications or the settings for
audio out jacks.
2
Connect the supplied AC power adaptor to
the transmitter.
1 2
3
R
A
L INPUT
B
CHANNEL
DC IN 12V
Approx. hours*
1
To DC IN
28 hours*
2
12V jack
To an AC
outlet
22 hours*
2
at 1 kHz, 1 mW+1 mW output
AC power adaptor
Time stated above may vary, depending on the
(supplied)
temperature or conditions of use.
Notes
Sending RF signals from the transmitter
• Use only the supplied AC power adaptor. Do not
The transmitter starts sending RF signals automatically when
use any other AC power adaptor.
it detects an audio signal from the connected equipment.
If it does not detect an audio signal for more than about 10
minutes, the transmitter will stop sending RF signals, and the
POWER/CHARGE indicator will turn off.
When the transmitter receives an audio signal again, it starts
Polarity of the plug
sending the RF signals, and the POWER/CHARGE
• When the transmitter is placed on or near a TV, it
indicator will light up green again.
may pick up a noise. In such a case, place the
If the audio signal is very weak, the transmitter does not
transmitter away from the TV.
send RF signals. If the transmitter is connected to a
• If the connected equipment has the AVLS
headphone jack, make sure the volume of the equipment
(Automatic Volume Limiter System) function, be
connected is set to 5 - 6 or higher.
sure to turn the function off when using the
You may not hear the beginning of the sound from the
transmitter. Otherwise, you will have to turn up the
headphones until the transmitter starts sending the RF
volume of the headphones, and that may cause
signals after detecting an audio signal.
noise.
The headphones automatically turn off
when they are taken off
N Operating the system
– Auto power on/off function
Do not pull up the self-adjusting band when not in
Listening to a program
use, as this will consume the battery power.
Before listening
To reduce the risk of hearing damage, first lower the
volume.
1
Turn on the audio/video equipment
connected to the transmitter.
If the transmitter is connected to the headphone
jack, set the volume control of the audio source
equipment as high as possible but not so high that
the audio signal becomes distorted.
2
Notes
Remove the headphones from the
• If hiss is heard, move closer to the transmitter.
transmitter.
• You may hear some noise when you disconnect the
The transmitter's POWER/CHARGE indicator
AC power adaptor from the transmitter before turn
lights up green.
off the headphones.
To INPUT A
Noise Reduction process (MDR-RF970RK
jacks
only)
The transmitter unit compresses the audio signal and
converts it to RF signal. The headphones unit converts
Headphones
the received RF signal to an audio signal and
decompresses it.
This process reduces noise picked up during
B
transmission.
Transmitter unit
input signal
Transmitter
1 The transmitter unit compresses the audio signals
dynamic range, then converts it to RF signal.
3
Select the radio frequency with the
2 Noise may occur due to long distance
CHANNEL selector switch.
transmission, etc.
3 The headphones unit converts the RF signal to an
audio signal.
4 Noise may occur during conversion.
5 Decompression of the audio signals dynamic range
reduces the noise level and improves the S/N
1 2
3
(signal-to-noise) ratio.
CHANNEL
To headphones
jack (Stereo
4
Put on the headphones.
The effective areas of
mini jack)
When you put on the headphones, the
the transmitter
WALKMAN*,
headphone's power turns on automatically.
TV, etc.
The POWER indicator on the right housing glows
red.
The optimum distance is up to approximately
Be sure to put the right housing R on your right
45 metres without the system picking up some
ear and the left housing L on your left ear.
interference. However, the distance may vary
depending on the surroundings and environment. If
Wear the headphones vertically on your head so
the system picks up some noise within the above
that auto power on function is properly activated.
mentioned distance, reduce the distance between the
transmitter unit and the headphones, or select another
channel.
To INPUT B
jack
Notes
• When you use the headphones inside the effective
areas of the transmitter, the transmitter can be
placed in any direction from the listener.
• Even within the signal reception area, there are some
spots (dead spots) where the RF signal cannot be
B
received. This characteristics is inherent to RF
signals, and does not indicate malfunction. By
5
Set the channel to that of the transmitter
slightly moving the transmitter, location of the dead
with the selector (or button) on the right
spot can be changed.
housing of the headphones.
Replacing the ear pads
A MDR-RF925RK
Select the channel to that of the transmitter with
the TUNING selector on the right housing of the
The ear pads are replaceable. If the ear pads become
dirty or worn out, replace them as illustrated below.
headphones.
The ear pad is not commercially available. You can
When tuning has completed, turn up the volume
order replacements from the store where you
to a moderate level with the VOLUME control on
Left channel
purchased this system, or at your nearest Sony dealer.
the right housing.
(white)
1
Remove the old ear pad by pulling it out of
R
the groove on the housing.
TUNING
VOLUME control
selector
1
2 3
VOLUME
B MDR-RF970RK
Press the TUNING button briefly for automatic
tuning of the headphones. If you do not receive a
clear audio signal, press it again.
When tuning has completed, turn up the volume
2
to a moderate level with the VOLUME control on
Place the new ear pad on the driver unit.
the right housing.
Hang the edge of the ear pad on one side of the
driver unit's groove edge, then turn the edge of
R
ear pad around the driver unit as illustrated
below.
VOLUME control
TUNING
When the ear pad is securely inserted into the
button
groove, adjust the ear pad to the vertical position.
VOLUME
TUNING
Transmitter
N Additional information
Precautions
• If the transmitter is not to be used for a long period of
time, disconnect the AC power adaptor from the AC
outlet by holding the plug. Do not pull on the cord.
• Do not leave the wireless stereo headphone system
in a location subject to direct sunlight, heat or
moisture.
Notes on headphones
To reduce the risk of 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.
Caring for others
Keep the volume at a moderate level. This will allow
you to hear outside sounds and to be considerate to
the people around you.
Self-
If you have any questions or problems concerning the
adjusting
system that are not covered in this manual, please
band
consult your nearest Sony dealer.
Be sure to bring the headphones and the transmitter to
the Sony dealer when requiring repair work.
Troubleshooting
No sound/Muffled sound
, Check the connection of the audio/video
equipment or the AC power adaptor.
, Check that the audio/video equipment is
turned on.
, Turn up the volume on the connected audio/
video equipment, if the transmitter is
connected to the headphones jack.
, Change the radio frequency with the
CHANNEL selector switch on the transmitter,
then set to the same radio frequency with the
TUNING selector (or TUNING button) on the
right housing of the headphones.
Headphones unit
, The muting function is activated.
RF transmission
output signal
• Use the headphones near the transmitter.
, The headphones' POWER indicator light turns
2 34
noise level (low)
off, dims, flashes, or sound becomes distorted
1
compression
decompression
5
or noisy.
• Charge the rechargeable battery if it is weak,
or replace alkaline batteries with new ones. If
the POWER indicator is still off after charging
the battery, take the headphones to a Sony
dealer.
Distortion
, If the transmitter is connected to the
headphones jack, turn down the volume on the
connected audio/video equipment.
, Change the radio frequency with the
CHANNEL selector switch on the transmitter,
then set to the same radio frequency with the
TUNING selector (or TUNING button) on the
right housing of the headphones.
, The headphones' POWER indicator light turns
off, dims, flashes, or sound becomes distorted
or noisy.
• Charge the rechargeable battery if it is weak,
or replace alkaline batteries with new ones. If
the POWER indicator is still off after charging
the battery, take the headphones to a Sony
dealer.
Loud background noise
, Move closer to the transmitter. As you move
away from the transmitter, more noise is likely
to be heard.
, If the transmitter is connected to the
headphones jack, turn up the volume of the
connected audio/video equipment.
, Change the radio frequency with the
CHANNEL selector switch on the transmitter,
then set to the same radio frequency with the
TUNING selector (or TUNING button) on the
right housing of the headphones.
, The headphones' POWER indicator light turns
off, dims, flashes, or sound becomes distorted
or noisy.
• Charge the rechargeable battery if it is weak,
or replace alkaline batteries with new ones. If
the POWER indicator is still off after charging
the battery, take the headphones to a Sony
dealer.
Specifications
General
Carrier frequency
915.5 MHz, 916.0 MHz, 916.5 MHz
Channel
Ch1, Ch2, Ch3
Modulation
FM stereo
Frequency response
MDR-RF925R: 20 – 20,000 Hz
MDR-RF970R: 10 – 22,000 Hz
Transmitter TMR-RF925R, RF970R
Power source DC 12 V: supplied AC power adaptor
Audio input
Phono jacks, stereo mini jack
Dimensions
Approx. 216 × 105 × 96 mm (w/h/d)
Mass
Approx. 220 g
Headphones MDR-RF925R, RF970R
Power source Supplied rechargeable nickel-metal
hydride battery BP-HP550-11 or
commercially available (size AAA) dry
batteries
Mass
Approx. 300 g incl. Battery
Design and specifications are subject to change
without notice.
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