Sony MDR RF925RK, MDR RF970RK manual

3-100-340-11(2)	N Getting started

	Wireless Stereo	Unpacking
	Wireless Stereo
	Headphone System	Check that you have the following items:
	Headphone System	• The headphones (1)
		• The headphones (1)

Operating Instructions

Mode d’emploi

5 Rest the headphones on the transmitter so that the transmitter’s POWER/CHARGE indicator lights in red.

Please place the headphones on the transmitter so that the triangle arrow would be matched. If the headphones are not properly placed, it will not be charged.

Charging will take about 16 hours, after which the POWER/CHARGE indicator will go off.

Headphones

Notes on Batteries•Do not charge a dry battery.

•Do not carry a dry battery together with coins or other metallic objects. It can generate heat if the positive and negative terminals of the battery accidentally come into contact with metallic objects.

•If you are not going to use the unit for a long time, remove the batteries to avoid damage from battery leakage or corrosion.

Checking the remaining battery power

Pull up the self-adjusting band and check the POWER 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.

Notes•Use only the supplied AC power adaptor. Do not use any other AC power adaptor.Polarity of the plug

•When the transmitter is placed on or near a TV, it may pick up a noise. In such a case, place the transmitter away from the TV.

•If the connected equipment has the AVLS (Automatic Volume Limiter System) function, be sure to turn the function off when using the transmitter. Otherwise, you will have to turn up the volume of the headphones, and that may cause noise.

Sending RF signals from the transmitter

The transmitter starts sending RF signals automatically when 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 sending the RF signals, and the POWER/CHARGE indicator will light up green again.

If the audio signal is very weak, the transmitter does not send RF signals. If the transmitter is connected to a headphone jack, make sure the volume of the equipment connected is set to 5 - 6 or higher.

You may not hear the beginning of the sound from the headphones until the transmitter starts sending the RF signals after detecting an audio signal.

NAdditional 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 headphonesTo reduce the risk of hearing damage

Avoid using headphones at high volume. Hearing experts advise against continuous, loud and extended

MDR-RF925RK

MDR-RF970RK

• The transmitter (1)

• AC power adaptor (1)

• Connecting cord (1) (phono plugs y stereo

POWER/CHARGE Transmitter indicatorAbout the charging method of the systemThis system employs a contactless charge method that

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 your nearest Sony dealer.

Setting up the transmitter

1 Connect the transmitter to audio/videoequipment.

NOperating the system

Listening to a program

Before listeningTo 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

The headphones automatically turn off when they are taken off– Auto power on/off function

Do not pull up the self-adjusting band when not in use, as this will consume the battery power.

Self- adjusting band

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.

If you have any questions or problems concerning the system that are not covered in this manual, please consult your nearest Sony dealer.

Be sure to bring the headphones and the transmitter to the Sony dealer when requiring repair work.

English

WARNING

To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.

To reduce the risk of fire or electric shock, do not place objects filled with liquids, such as vases, on the apparatus.

To avoid electrical shock, do not open the cabinet. Refer servicing to qualified personnel only.

For the customers in the USA and CanadaRECYCLING NICKEL METAL HYDRIDE BATTERIES

Nickel Metal Hydride batteries are recyclable. You can help preserve our environment by returning your used rechargeable batteries to the collection and recycling location nearest you.

For more information regarding recycling of rechargeable batteries, call toll free 1-800-822-8837, or visit http://www.rbrc.org/

miniplug), 1 m

• Unimatch plug adaptor (1) (stereo mini jack y

stereo phone plug) (MDR-RF970RK only)

• Rechargeable nickel-metal hydride battery

BP-HP550-11 (1)

requires no terminals by the electromagnetic induction.

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.

Charging point

•Do not leave any objects susceptible to magnetism (cash cards, floppy disks with magnetic coding, etc.) near the system. Exposure to the transmitter’s electromagnetic field may render them unusable.

Select one of the hookups below depending on the jack type:ATo connect to a headphones jackTransmitterTo INPUT A jacks

1 2 3	R	A	L INPUT B
CHANNEL	DC IN 12V

equipment as high as possible but not so high that the audio signal becomes distorted.

2 Remove the headphones from the transmitter.The transmitter’s POWER/CHARGE indicator lights up green.

Headphones

Notes

•If hiss is heard, move closer to the transmitter.

•You may hear some noise when you disconnect the AC power adaptor from the transmitter before turn off the headphones.

Noise Reduction process (MDR-RF970RK only)

The transmitter unit compresses the audio signal and converts it to RF signal. The headphones unit converts the received RF signal to an audio signal and decompresses it.

This process reduces noise picked up during transmission.

Transmitter unit			Headphones unit
range	input signal	RF transmission	output signal
range

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.

, The muting function is activated.

• Use the headphones near the transmitter.

Connect AC power adaptor to an easily accessible AC outlet. Should you notice an abnormality in AC power adaptor, disconnect it from the AC outlet immediately.

Do not install the appliance in a confined space, such as a bookcase or built-in cabinet.

Do not expose the battery to excessive heat such as direct sunlight, fire or the like.

Information

You are cautioned that any changes or modifications not expressly approved in this manual could void your authority to operate this equipment.

If you have any questions about this product, you may call:Sony Customer Information Services Center 1-800-222-7669 or http://www.sony.com/Declaration of Conformity

Caution:Do not handle damaged or leaking Nickel Metal Hydride batteries.

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.

Some features are:

• Wireless transmission lets you enjoy TV or music

without the restriction of a cord

• High fidelity sound reproduction

• Enhanced clarity of sound with minimal

transmission noise by use of noise reduction

technology (MDR-RF970RK only)

• Easy connection to TV and Audio system equipment

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.

To charge the headphones, place them on the transmitter.1 Press the PUSH button of the left housing toopen the battery compartment lid.The battery compartment lid comes off.

Headphones

Rechargeable batteryLines of magnetic force

Transmitter

•Do not place a radio near the system. A noise may be heard from the radio. In such a case, change the angle of the radio or move away from the system so that a noise is not heard.

When the transmitter’s POWER/CHARGE indicator does not light up red

Right channel (red)Connecting cord (supplied)

Unimatch plug adaptor (MDR-RF970RK: supplied)

To headphones jack (Stereo phone jack)

Left channel (white)To headphones jack (Stereo mini jack)WALKMAN*,TV, etc.

Transmitter

3 Select the radio frequency with the CHANNEL selector switch.

1 2 3

CHANNEL

4 Put on the headphones.When you put on the headphones, the headphone’s power turns on automatically.The POWER indicator on the right housing glows red.Be sure to put the right housing R on your right

dynamic	2 34	noise level (low)
	2 34	noise level (low)
1 compression	decompression	5

1The transmitter unit compresses the audio signals dynamic range, then converts it to RF signal.

2Noise may occur due to long distance transmission, etc.3The headphones unit converts the RF signal to an audio signal.4Noise may occur during conversion.

5Decompression of the audio signals dynamic range reduces the noise level and improves the S/N (signal-to-noise) ratio.

The effective areas of the transmitter

The optimum distance is up to approximately 150 feet without the system picking up some interference.

, 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.

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.

Trade Name:	SONY
Model No.:	MDR-RF925R
	MDR-RF970R
	(Headphones Unit)
Responsible Party:	Sony Electronics Inc.
Address:	16530 Via Esprillo,
	San Diego, CA 92127 USA
Telephone No.:	858-942-2230

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.

Note

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

–Reorient or relocate the receiving antenna.–Increase the separation between the equipment and receiver.

–Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

–Consult the dealer or an experienced radio/ TV technician for help.For the customers in CanadaOperation is subject to the following two conditions:

(1)this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

• Up to 150 feet reception range

• Hassle-free recharging by simply placing

headphones on the transmitter base station;

headphones charge via electromagnetic induction

• Convenient volume adjustment on the headphones

• Comfortable fit with adjustable headband and

complete coverage of the ear

• Headphones automatically turn on when placed

over the head and turn off when removed, saving

battery power

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.

PUSH button

2 Insert the supplied rechargeable nickel- metal hydride battery into the battery compartment matching the 3 terminal on the battery to the 3 mark in the compartment.

Do not use rechargeable battery other than the supplied one.3 Close the battery compartment lid.

1Insert the tab into the hole at the upper left. 2Close the lid until it clicks.

1 L

4 Connect the supplied AC power adaptor to the transmitter.

1 2 3	R	A	L INPUT B
CHANNEL	DC IN 12V

To DC IN	Transmitter
To DC IN
12V jack	To an AC
	outlet
	AC power adaptor
	(supplied)

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. Since the built-in timer recognizes when charging is complete, there is no need to remove the headphones from the transmitter after charging.

Notes

•The transmitter automatically stops sending RF signals while charging the battery.

•This system is designed to charge only the supplied rechargeable battery type BP-HP550-11 for safety. Note that other types of rechargeable batteries cannot be charged with this system.

•If dry batteries are installed, they cannot be charged.

•Do not attempt to use the supplied BP-HP550-11 rechargeable battery for other components. They are for use with this system only.

•Charge in an environmental temperature of between 0 °C and 40 °C (between 32 °F and 104 °F).

Charging and usage hours

Approx. charging	*Approx. usage time1**
*hours1**
*hours1**	MDR-RF925RK MDR-RF970RK
	MDR-RF925RK MDR-RF970RK
1 hour	60 minutes*3	40 minutes*3
16 hours*2	18 hours*3	14 hours*3

*1 at 1 kHz, 1 mW+1 mW output

*2 hours required to fully charge an empty battery *3 Time stated above may vary, depending on the

temperature or conditions of use.Using the headphones with dry batteries (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 function will not be activated.

Battery life(Using Sony alkaline batteries LR03/AM-4 (N))

Model	*Approx. hours1**
MDR-RF925RK	28 hours*2
MDR-RF970RK	22 hours*2

*1 at 1 kHz, 1 mW+1 mW output

*2 Time stated above may vary, depending on the temperature or conditions of use.

BTo connect to LINE OUT or REC OUT

Transmitter

To INPUT B jack

1 2 3	R	A	L INPUT B
CHANNEL	DC IN 12V

Connecting cord (supplied)

Right	Left channel
channel (red)	(white)

To LINE OUT orREC OUT jacksStereo system,VCR, etc.*“WALKMAN” and “WALKMAN” logo are registered trademarks of Sony Corporation.2 Connect the supplied AC power adaptor to the transmitter.

1 2 3	R	A	L INPUT B
CHANNEL	DC IN 12V

To DC IN	Transmitter
To DC IN
12V jack	To an AC
	outlet
	AC power adaptor
	(supplied)

ear and the left housing L on your left ear. Wear the headphones vertically on your head so that auto power on function is properly activated.

5 Set the channel to that of the transmitter with the selector (or button) on the right housing of the headphones.

AMDR-RF925RK

Select the channel to that of the transmitter with the TUNING selector on the right housing of the headphones.

When tuning has completed, turn up the volume to a moderate level with the VOLUME control on the right housing.

	R
VOLUME control	TUNING
	selector
	1	2	3
VOLUME

BMDR-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 to a moderate level with the VOLUME control on the right housing.

	R
VOLUME control	TUNING
	button
VOLUME	TUNING

However, the distance may vary depending on the surroundings and environment. If the system picks up some noise within the above mentioned distance, reduce the distance between the transmitter unit and the headphones, or select another channel.

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 received. This characteristics is inherent to RF signals, and does not indicate malfunction. By slightly moving the transmitter, location of the dead spot can be changed.

Replacing the ear pads

The ear pads are replaceable. If the ear pads become dirty or worn out, replace them as illustrated below. The ear pad is not commercially available. You can order replacements from the store where you purchased this system, or at your nearest Sony dealer.

1 Remove the old ear pad by pulling it out of the groove on the housing.2 Place the new ear pad on the driver unit.

Hang the edge of the ear pad on one side of the driver unit’s groove edge, then turn the edge of ear pad around the driver unit as illustrated below.

When the ear pad is securely inserted into the groove, adjust the ear pad to the vertical position.

• 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
	(8 5/8 ⋅ 4 1/4 ⋅ 3 7/8 in) (w/h/d)
Mass	Approx. 220 g (7.77 oz)

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 (10.59 oz) incl. Battery

Design and specifications are subject to change without notice.

N Getting started

Wireless Stereo

Unpacking

Headphone System

Operating Instructions

Mode d’emploi

NAdditional information

Precautions

MDR-RF925RK

MDR-RF970RK

Setting up the transmitter

NOperating the system

Listening to a program

English

WARNING

Troubleshooting

Welcome!

Charging the supplied rechargeable battery

The effective areas of the transmitter

Notes on receiving performance

Replacing the ear pads

Specifications