Sony MDRIF245RK User Manual

Cordless Stereo 

Headphone System

Operating Instructions

Manual de instrucciones

©2012 Sony Corporation   Printed in China

4-429-158-14(1)

MDR-IF245RK

To reduce the risk of fire or electric shock, do not expose this 

apparatus to dripping or splashing, and do not place objects 

filled with liquids, such as vases, on the apparatus.

Do not expose the batteries (battery pack or batteries installed) 

to excessive heat such as sunshine, fire or the like for a long time.

To avoid electrical shock, do not open the cabinet. Refer 

servicing to qualified personnel only.

Do not install the appliance in a confined space, such as a 

bookcase or built-in cabinet.

As the main plug of AC power adaptor is used to disconnect the 

AC power adaptor from the mains, connect it to an easily 

accessible AC outlet. Should you notice an abnormality in it, 

disconnect it from the AC outlet immediately.

Excessive sound pressure from earphones and headphones can 

cause hearing loss.

AC adaptor is not disconnected from the mains as long as it is 

connected to the AC outlet, even if the unit itself has been 

turned off.

The nameplate is located on the bottom exterior.

You are cautioned that any changes or modifications not 

expressly approved in this manual could void your authority to 

operate this equipment.

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/

Caution: Do not handle damaged or leaking Nickel Metal 

Hydride batteries.

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.

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The illustration below shows the approximate area covered by 

the infrared rays emitted from the transmitter when you wear 

the headphones and face the transmitter.

Transmitter

Top view

Approx. 3 m (10 ft)

Approx. 8 m 

(26 ft)

90°

90°

Side view

Approx. 3 m (10 ft)

Approx. 8 m 

(26 ft)

Transmitter

If you use the headphones at too great a distance from the 

transmitter, you may hear a hissing noise, and if there is an 

object between the headphones and the transmitter, sound 

may be interrupted. These phenomena are inherent in infrared 

ray communication and not a malfunction.

Do not cover the infrared sensors with your hands or hair.

When you use the headphones inside the area in the 

illustration above, the transmitter can be placed in front, 

behind or by the side of you. However, depending on 

circumstances, the area covered by the infrared rays may be 

smaller than illustrated.

The noise you may hear through the headphones may vary 

depending on the transmitter position and room conditions. It 

is recommended that you place the transmitter in a location 

that produces the clearest sound.

Do not use this system in areas exposed to direct sunlight or 

other strong light. The sound may be interrupted.

Plasma displays may interfere with normal operation of this 

system.

The brightness of the infrared emitters may not be uniform; 

however, this is not a malfunction.

If the infrared rays are obstructed, or the headphones are used 

outside their effective range, noise will increase and sound will 

become hard to hear. In such a case, this function mutes any 

sound from the headphones to avoid potential ear damage as a 

result of noise. Sound is automatically restored when you move 

nearer the transmitter or remove the obstruction.

The supplied rechargeable nickel-metal hydride battery is not 

charged from the first time you use it. Be sure to charge them 

before use.

Placing the headphones on the transmitter automatically turns 

them off, then charging starts. This eliminates the need for 

turning on/off every time you wear and take off the headphones.

Check if the right and left headphones are rested on the 

transmitter correctly. Take off the headphones and place them 

on the transmitter again so that the headphones’ contact points 

meet the transmitter’s contact pins.

Depending on the remaining battery status, it takes approx. 30 

minutes to 7 hours to recharge.

7 hours

2)

28 hours

3)

1)  at 1 kHz, 0.1 mW + 0.1 mW output

2)  hours required to fully charge an empty battery

3)  Time may vary, depending on the temperature or conditions 

of use.

Place the headphones on the transmitter after use. The CHG 

indicator lights up, then charging starts.

When charging is complete, there is no need to remove the 

headphones from the transmitter.

To check the remaining battery charge of the headphones, turn 

on the headphones, and check the POWER indicator. The battery 

is still serviceable when the indicator lights up red.

Charge the headphones if the POWER indicator turns off, dims, 

flashes, or the sound becomes distorted or noisy.

Insert the AC adaptor plug firmly.

Be sure to use the supplied AC adaptor. Using AC adaptors 

with different plug polarity or other characteristics can cause 

product failure.

Unified 

polarity plug

The battery capacity may decrease if the headphones are 

turned on and placed on the transmitter with the AC adaptor 

disconnected.

The transmitter automatically turns off while charging the 

battery.

This system is designed to charge only the supplied 

rechargeable battery BP-HP550-11 for safety. Note that other 

types of rechargeable battery cannot be charged with this 

system.

If dry batteries are installed, they cannot be charged.

Do not attempt to use the supplied rechargeable battery BP-

HP550-11 for other components. It is for use with this system 

only.

Charge in an environmental temperature of between 5 °C and 

35 °C (between 41 °F and 95 °F).

When the battery life reduces to half, this may be the end of 

battery lifetime. The supplied rechargeable battery 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.

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Commercially available (size AAA) dry batteries can also be used 

to power the headphones. Install two batteries in the same 

manner as described in step 1 of “How to use.”

When dry batteries are installed, the battery charge function is 

not activated.

Sony alkaline battery LR03

50 hours

2)

1)  at 1 kHz, 0.1 mW + 0.1 mW output

2)  Time may vary, depending on the temperature or conditions 

of use.

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 are accidentally come into contact with 

metallic objects.

Do not connect to the AUDIO IN 1 and AUDIO IN 2 jacks at the 

same time. If you connect two A/V components to both jacks 

at the same time, both of the audio signals may result in mixed 

output.

When you connect the connecting cable directly to an 

earphone jack (monaural mini jack), the audio signal may not 

be output through the right channel.

If you connect the transmitter to the headphone jack of the A/

V component, set the volume of the A/V component as high as 

possible but not so high that the audio signal becomes 

distorted.

When watching videos, be careful not to raise the volume too 

high in quiet scenes. You may hurt your ears when a loud 

scene is played.

The earpads are replaceable. If the earpads become dirty or 

worn out, replace them as illustrated below. The earpads are not 

commercially available. You can order replacements from the 

store where you purchased this system, or at your nearest Sony 

dealer.



Remove the old earpad 

by pulling it off.

Place the new earpad 

around the housing.

If you run into any problems using this system, use the following 

checklist. Should any problem persist, consult your nearest Sony 

dealer.

Turn on the headphones.

Check the connection of the A/V component or the AC 

adaptor.

Check that the A/V component is turned on.

If you connect the transmitter to an A/V component using the 

headphone jack, raise the volume level on the connected A/V 

component within the range where the sound is not distorted.

Check that the infrared sensors of the headphones are not 

covered with your hands or hair.

Check that there is no object between the transmitter and the 

headphones.

Use the headphones near the transmitter, or change the 

position of the transmitter.

Charge the supplied rechargeable battery, or replace dry 

batteries with new ones. If the POWER indicator is still off after 

charging, take the headphones to a Sony dealer.

Raise the headphone volume.

Use the headphones near the transmitter, or change the 

position of the transmitter.

If you connect the transmitter to an A/V component using the 

headphone jack, lower the volume level on the connected A/V 

component within the range where the sound is not distorted.

Charge the supplied rechargeable battery, or replace dry 

batteries with new ones. If the POWER indicator is still off after 

charging, take the headphones to a Sony dealer.

Use the headphones near the transmitter, or change the 

position of the transmitter. (As you move away from the 

transmitter, more noise is likely to be heard. This is inherent in 

infrared ray communication and not a malfunction.)

Check that there is no object between the transmitter and the 

headphones.

Check that the infrared sensors on the headphones are not 

covered with your hands or hair.

If you use the headphones by a window where the sunlight is 

too strong, draw the curtains/blinds to shut out the direct 

sunlight, or use the headphones away from the sunlight.

If you connect the transmitter to an A/V component using the 

headphone jack, raise the volume level on the connected A/V 

component within the range where the sound is not distorted.

Charge the supplied rechargeable battery, or replace dry 

batteries with new ones. If the POWER indicator is still off after 

charging, take the headphones to a Sony dealer.

If you have another transmitter, check if more than one 

transmitters are used at the same time. Turn off other 

transmitter or move to a place outside the range of this 

transmitter.

The transmitter turns off if no signal  or low signal is input for 

10 minutes. If you connect the transmitter to an A/V 

component using the headphone jack, raise the volume level 

on the connected A/V component within the range where the 

sound is not distorted.

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Check that the right/left of the headphones and transmitter 

correspond, and put the headphones on the transmitter 

correctly.

Install the supplied rechargeable nickel-metal hydride battery. 

Dry batteries and rechargeable batteries other than the 

supplied cannot be charged.

If the CHG indicator does not light up even though you put the 

headphones on the transmitter and wait for a while, it may be 

the end of battery lifetime. You can order the supplied 

rechargeable battery BP-HP550-11 from the store where you 

purchased this system, or at your nearest Sony dealer.

When this system is not to be used for a long period of time, 

disconnect the AC adaptor from the AC outlet holding the 

plug, and remove the battery from the headphones to avoid 

damage caused by battery leakage and subsequent corrosion.

Do not leave this system in a location subject to direct 

sunlight, heat or moisture.

This system is guaranteed for use in the temperature range of 

5 °C to 35 °C (41 °F to 95 °F).

You may hear some noise when you disconnect the AC 

adaptor from the transmitter before taking off the 

headphones.

Avoid exposure to temperature extremes, direct sunlight, 

moisture, sand, dust or mechanical shock.

Avoid using headphones at high volume. Hearing experts advise 

against continuous, loud and extended play. If you experience a 

ringing in your ears, lower the volume or discontinue use.

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.

Modulation 

FM stereo

Carrier frequency  Right 2.8 MHz
 

Left 2.3 MHz

Frequency response
 

10 Hz – 20,000 Hz

Audio inputs 

Pin jacks (left/right)  

Stereo mini jack

Power requirements 

DC 12 V (from the supplied AC adaptor)

Dimensions 

Approx. 140 mm × 60 mm × 105 mm  

(5 

1

/

2

 in × 2 

3

/

8

 in × 4 

1

/

7

 in) (w/h/d)

Mass 

Approx. 200 g (7.06 oz)

Frequency response
 

10 Hz – 24,000 Hz

Power source 

Supplied rechargeable nickel-metal hydride 

battery BP-HP550-11, or commercially 

available (size AAA) dry batteries

Mass 

Approx. 200 g (7.06 oz) including battery

Transmitter TMR-IF245R

Headphones MDR-IF245R

AC adaptor (12 V) (1)

Connecting cable (stereo mini plug  pin plug × 2), 1 m  

(39 

3

/

8

 in) (1)

Rechargeable nickel-metal hydride battery BP-HP550-11  

(550 mAh min) (1)

Card warranty (1)

Operating Instructions (this manual) (1)

Design and specifications are subject to change without notice.

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Transmitter TMR-IF245R (1)

AC adaptor (1)

Rechargeable nickel-metal 

hydride battery  

(BP-HP550-11) (1)

Headphones MDR-IF245R (1)

Connecting cable (stereo mini 

plug  pin plug × 2), 1 m (1)

Thank you for purchasing the Sony MDR-IF245RK Cordless Stereo 

Headphone System. Before operating the unit, please read this 

manual thoroughly and retain it for future reference.

Some features are:

Lightweight headphones for long time listening comfort.

Approx. 28 hours playback with supplied Ni-MH rechargeable 

battery. AAA alkaline batteries (not supplied) can also be used 

as alternative power.

Battery is automatically charged by placing the headphones 

on the transmitter.

40 mm driver units for powerful, expressive sound.

Muting function reduces noise disturbance.

Self-adjusting headband mechanism eliminating the need for 

headband adjustment.

Up to 8 meters (26 feet) reception range.

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To AC 

outlet

(Red)

(Off)

Complete when 

indicator turns off.

Connect the A/V component, following hookup  or  below.
 Using the headphone jack of the A/V component

L (white)

R (red)

Stereo mini 

plug

Headphone jack 

(Stereo mini jack)

TV, Digital music player, etc.

L (white)

R (red)

Stereo mini plug

Audio out  

(L/R) jacks

Stereo system, Blu-ray Disc player, DVD player, TV*, etc.

* In case of no headphone jack.

The infrared sensors of the headphones are located as illustrated below.

Use the transmitter in a position facing the headphones.

If the infrared sensors of one housing are covered by your hands (when adjusting the 

volume, etc.), the muting function may be activated to reduce noise caused by 

obstruction of the infrared rays. To restore sound, move nearer the transmitter, or 

orient the sensor of the uncovered housing toward the transmitter.

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Take off the headphones, then turn off the power.

When no signal is input for about 10 minutes, the 

transmitter turns off automatically*. The infrared 

emitters of the transmitter also turn off. The 

transmitter restarts after receiving an audio signal 

again.

The transmitter may also turn off if low signal is 

input for about 10 minutes. In this case, raise the 

volume of the connected A/V component within 

the range where the sound is not distorted, then 

lower the volume of the headphones.

*  If signal noise is output from the connected A/V 

component, the transmitter may not turn off, 

even when no audio signal is input.

To reduce the risk of hearing damage, first lower the volume.

 Using the audio out (L/R) jacks of the A/V component

Observe the correct polarity when installing battery.

Contact 

pins

Lower volume

Up

Tactile dot

Down

Rechargeable nickel-metal hydride 

battery BP-HP550-11 (supplied)

Contact 

points

Tactile dot

Insert the  

end first.

If you want to receive audio on the headphones while at the same time hearing audio from the television speakers: 

connect the transmitter to your Cable Box/Satellite Box rather than your television.

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