Sennheiser Headphones RS 125 User Manual

Wireless Listening Pleasure  
RS 125  
Instruction manual  
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I
1
5
4
3
2
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II  
6
7
8
B
ON/OFF  
CHARGE  
A
0
9
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Contents  
Contents  
Inserting and changing the headphones’ rechargeable  
1
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Important safety instructions  
Important safety instructions  
Read this instruction manual.  
Keep this instruction manual for future reference. Always include this  
instruction manual when passing the devices on to third parties.  
Clean the devices and the mains unit only with a dry cloth.  
WARNING: To reduce the risk of fire or electric shock, do not expose the  
devices and the mains unit to rain or moisture.  
Only use the supplied mains unit.  
Disconnect the mains connector from the wall socket  
– to completely disconnect the devices from the mains,  
– during lightning storms or when unused for long periods of time.  
Ensure that the mains unit is  
– always readily operable and easily accessible,  
– properly plugged into the wall socket,  
– only operated within the permissible temperature range (see  
– not covered or exposed to direct sunlight for longer periods of time in  
order to prevent heat accumulation.  
Intended use of the devices  
Intended use includes:  
having read this instruction manual, especially the chapter “Important  
safety instructions”,  
using the devices within the operating conditions and limitations  
described in this instruction manual.  
“Improper use” means using the devices other than as described in this  
instructions, or under operating conditions which differ from those  
described herein.  
2
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Important safety instructions  
Safety instructions for NiMH rechargeable batteries  
If abused or misused, rechargeable batteries may leak. In extreme cases,  
they may even present:  
a heat hazard,  
a fire hazard,  
a leakage hazard,  
an explosion hazard,  
a smoke or gas hazard.  
Please understand that Sennheiser does not accept liability for damage  
arising from abuse or misuse.  
Keep away from  
children.  
Only use original Sennheiser  
rechargeable batteries.  
Observe correct  
polarity.  
Do not short-circuit.  
Do not expose to  
moisture.  
Switch rechargeable battery-  
powered devices off after use.  
Do not pack charged  
batteries loose – danger  
of shorting out / fire  
hazard.  
When not using rechargeable  
batteries for extended periods  
of time, charge them regularly  
(about every three months).  
Do not continue to use  
defective rechargeable  
batteries.  
Do not heat above 70°C/158°F,  
e.g. do not expose to sunlight or  
throw into a fire.  
Do not mutilate or  
dismantle.  
Only charge rechargeable  
batteries at ambient tempera-  
tures between 10°C and 40°C.  
Immediately remove  
rechargeable batteries  
from obviously defec-  
tive devices.  
Dispose of rechargeable batteries  
at special collection points or  
return them to your specialist  
dealer.  
Only charge rechargeable batteries with the appropriate  
Sennheiser chargers.  
3
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The RS 125 RF headphone system  
The RS 125 RF headphone system  
The RS 125 RF stereo hi-fi headphone system offers excellent  
sound quality and allows for wireless listening everywhere  
in the house and garden. The lightweight headphones are  
extremely comfortable to wear and very easy to use.  
The volume can easily be adjusted to individual needs. Enjoy a  
completely unrestricted listening experience without disturb-  
ing others.  
Delivery includes  
1 HDR 125 headphones  
1 TR 125 transmitter with connection cable  
2 AAA size NiMH rechargeable batteries, 1.2 V  
1 NT-RS 100 mains unit  
1 adapter 3.5 mm to ¼“ (6.3 mm) jack socket  
1 instruction manual  
4
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Product overview  
Product overview  
An overview of the headphones and the transmitter is given  
on the inside front cover of this instruction manual.  
Overview of the headphones  
I
1 Headband  
2 Volume control (VOLUME)  
3 Channel search button (TUNE)  
4 ON/OFF switch  
5 Earpad  
Overview of the transmitter  
II  
6 Charging cradle  
7 Operation indicator, green  
8 Charging indicator, red  
9 Channel selector switch  
0 Connection cable  
A Adapter for connection cable  
B Connector of mains unit  
5
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Product overview  
Overview of the indicators and acoustic signals  
Indicators on the transmitter  
Indicator  
Status  
Meaning  
lit  
The sound source and  
the transmitter are  
switched on.  
Operation indicator 7  
(ON/OFF)  
lit  
The rechargeable  
batteries are being  
charged.  
Charging indicator 8  
(CHARGE)  
flashes  
The rechargeable  
batteries are fully  
charged.  
Acoustic signals and their meaning  
Acoustic signal  
Meaning  
6 short beeps No signal!  
The transmitter is switched  
off or out of range.  
2 long beeps The rechargeable batteries  
are almost flat.  
Sequence of  
3 beeps  
The headphones have just  
been switched off.  
6
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Putting the RS 125 system into operation  
Putting the RS 125 system into  
operation  
Setting up the transmitter  
̈ Choose a suitable place near your sound source (e.g. TV,  
stereo or home cinema system).  
̈ Do not place the transmitter close to metal objects such as  
shelf supports, reinforced concrete walls, etc. as the metal  
affects the antenna and can decrease the transmitter’s  
range. This can be up to about 150 m in good conditions.  
̈ Choose a place for the transmitter where the antenna is in  
free space so that transmission can be as effective as  
possible.  
It is not necessary that the transmitter and headphones are in  
the same room, so you can move around freely in the home or  
outside in the garden.  
One transmitter can be used to transmit to several  
headphones on the same frequency.  
7
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Putting the RS 125 system into operation  
Wall mounting the transmitter  
The transmitter is prepared for wall mounting.  
The required mounting hardware (screws and  
plugs) is not included in the delivery.  
Connecting the transmitter to a sound source  
You can connect the TR 125 transmitter to different sound  
sources, such as a TV, a DVD player or a stereo system.  
̈ Switch your sound source off.  
A
0
̈ Connect the connection cable 0 to the headphone socket  
of your sound source.  
If the plug on the connection cable 0 is too small for your  
headphone socket, plug the adapter to ¼“ (6.3 mm) jack  
socket A onto the connection cable.  
8
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Putting the RS 125 system into operation  
̈ Adjust the volume of the headphone socket on your sound  
source to a medium level. This improves the quality of cord-  
less sound transmission. If necessary, check the menu  
setting of your TV.  
With most TVs, the headphone socket is located at the  
front or sides.  
Connecting the transmitter to the mains  
̈ Connect the yellow connector of the mains unit B to the  
yellow socket on the transmitter.  
̈ Plug the mains connector into a wall socket.  
The transmitter automatically switches on and the oper-  
ation indicator 7 lights up.  
If there is no signal from the sound source for more than three  
minutes, the transmitter automatically switches off and the  
operation indicator 7 goes off.  
Disconnecting the transmitter from the mains  
̈ Pull the mains connector out of the wall socket.  
Inserting and changing the headphones’ recharge-  
able batteries  
Before using the RS 125 for the first time, you have to insert  
the supplied rechargeable batteries.  
̈ Lift the left earpad 5 off as described in the chapter  
9
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Putting the RS 125 system into operation  
̈ Insert the rechargeable batteries. Observe  
correct polarity when inserting the bat-  
teries.  
̈ Put the earpad 5 back in place.  
If the operating time decreases drastically even when  
the rechargeable batteries are fully charged, the  
rechargeable batteries are exhausted and have to be  
replaced.  
Charging the headphones’ rechargeable batteries  
Charge the rechargeable batteries for at least 16 hours  
prior to first time use. Subsequent charging time is  
16h  
about the same time as the previous operating time.  
The operating time is up to 23 hours.  
6
8
CHARGE  
̈ Place the headphones on the charging cradle 6. Make sure  
that the charging indictor 8 lights up.  
The headphones automatically switch off and the recharge-  
able batteries are being charged.  
10  
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Putting the RS 125 system into operation  
Always store the headphones on the charging cradle 6  
to ensure that they are fully charged when they are  
needed. When the rechargeable batteries are fully  
charged, the transmitter automatically switches to  
trickle charging and the charging indicator 8 flashes  
slowly.  
Nearly discharged batteries will significantly reduce the sound  
quality. Approx. 10 minutes before the batteries are com-  
pletely discharged, an acoustic signal is produced.  
Adjusting the headband of the headphones  
For good sound quality and best possible comfort, the head-  
band has to be adjusted to properly fit your head:  
̈ Wear the headphones so that the head-  
1
band 1 runs over the top of your head.  
̈ Adjust the length of the headband so  
that  
– your ears are completely inside the  
earpads,  
– you feel even, gentle pressure around your ears,  
– a snug fit of the headband 1 on the head is ensured.  
11  
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Using the RS 125 system  
Using the RS 125 system  
To switch the devices on and to listen to your sound source,  
proceed as follows:  
Sequence of steps  
Page  
1. Make sure that the rechargeable batteries are  
charged.  
2. Switch your sound source (e.g. TV) on.  
3. Switch your headphones on.  
4. Set the desired volume.  
5. If necessary, set a different channel for your  
sound source.  
Switching the transmitter on and off  
Switching the transmitter on  
̈ Switch your sound source on.  
The transmitter automatically switches on and the opera-  
tion indicator 7 lights up.  
If the transmitter does not switch on:  
̈ Increase the volume of your sound source and, if necessary,  
Switching the transmitter off  
̈ Switch your sound source off.  
If there is no signal from the sound source for more than three  
minutes, the transmitter automatically switches off and the  
12  
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Using the RS 125 system  
operation indicator 7 goes off. The transmitter is now in  
standby mode, its power consumption is very low so that it  
can remain connected to the mains.  
When not using the devices for extended periods of  
time, pull out the mains connector from the wall socket.  
In this case, however, the headphones’ rechargeable  
batteries will not be recharged.  
Switching the headphones on and off  
CAUTION! Hearing damage due to high volumes!  
Listening at high volume levels for long periods  
can lead to permanent hearing defects.  
̈ Before putting the headphones on, set the  
volume to a low level.  
̈ Do not continuously expose yourself to high  
volumes.  
Switching the headphones on  
/
̈ Set the ON/OFF switch 4 on the headphones  
to the position ON.  
The headphones switch on and automatically start the  
channel search on the last selected channel. If a channel is  
found, the channel search stops. You hear the signal of the  
found sound source.  
If you do not hear the sound source after a short while, please  
13  
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Using the RS 125 system  
Switching the headphones off  
/
̈ Set the ON/OFF switch 4 on the headphones  
to the position OFF.  
The headphones switch off.  
Always store the headphones on the charging cradle 6  
to ensure that they are fully charged when they are  
needed.  
Searching for a sound source  
̈ Make sure that the operation indicator 7 on the trans-  
mitter is lit.  
If you do not hear the desired sound source, continue the  
search:  
̈ Press the TUNE button 3 on the headphones  
until you have found your sound source.  
3
̈ If you cannot find your sound source, please read the  
following section.  
14  
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Using the RS 125 system  
Changing the transmission channel  
If several transmitters are operated simultaneously and are  
very close to one another, the sound quality can deteriorate  
and you hear e.g. hissing noise. To improve the sound quality,  
change the transmission channel:  
̈ Set the channel selector switch 9 on  
the transmitter to channel 1, 2 or 3.  
9
To set the headphones to the selected channel:  
̈ Press the TUNE button 3 on the headphones.  
Adjusting the volume  
̈ Use the volume control 2 to adjust the volume to a suffi-  
cient and comfortable level.  
15  
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Using the RS 125 system  
Switching the acoustic signals (beeps) on and off  
An overview of the acoustic signals is given on page 6. The  
acoustic signals can be switched on and off as follows:  
̈ Switch the headphones on (see page 13).  
̈ Press the TUNE button 3 for 5 seconds.  
̈ Switch the headphones off for testing (see page 13).  
If the acoustic signals are switched on, the headphones  
produce a sequence of three beeps at switch-off. If no  
beeps are produced, the acoustic signals are now switched  
off.  
The setting for the acoustic signals is retained in  
memory until you change the setting again or replace  
the rechargeable batteries.  
16  
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Cleaning the RS 125 system  
Cleaning the RS 125 system  
CAUTION! Liquids can damage the electronics of the  
devices!  
Liquids entering the housing of the devices can  
cause a short-circuit and damage the electronics.  
̈ Keep all liquids far away from the devices.  
̈ Do not use any cleansing agents or solvents.  
̈ Before cleaning, switch the devices off and disconnect the  
transmitter from the mains.  
̈ Only use a slightly damp cloth to clean the devices.  
Replacing the earpads  
For reasons of hygiene, you should replace the earpads from  
time to time. Spare earpads are available from your Sennheiser  
̈ To loosen the quarter turn fastener which  
5
secures the earpads to the earcups, turn  
the earpads 5 in the direction of the  
arrow until you overcome a slight resis-  
tance.  
̈ Lift the earpads 5 off the earcups.  
5
17  
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If a problem occurs ...  
If a problem occurs ...  
The transmitter does not switch on  
Possible cause  
Solution  
Page  
Is the mains unit  
connected  
correctly?  
Check the connection of the  
mains unit to the transmitter and  
to the mains.  
Is the volume of  
the sound source  
sufficient?  
Set the volume on your sound  
source to a medium value.  
You cannot hear anything  
Possible cause  
Solution  
Page  
Is the transmitter  
placed close to  
metal objects?  
Choose a different place for the  
transmitter. Make sure that the  
transmitter is not placed close  
to metal objects.  
Are the head-  
Move the headphones closer to  
phones still within the transmitter. If necessary,  
the transmitter’s  
range?  
switch the headphones on again.  
Are all connectors  
connected  
correctly?  
Check the connection between  
the transmitter and your sound  
source.  
Are the recharge-  
able batteries  
charged?  
Place the headphones on  
the charging cradle.  
Check the charging indicator.  
Are the recharge-  
able batteries  
properly inserted?  
Remove the rechargeable batteries  
and reinsert them into the  
headphones.  
18  
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If a problem occurs ...  
The sound of your sound source is hardly intelligible  
Possible cause  
Solution  
Page  
You do not hear  
your desired  
channel?  
Press the TUNE button 3 on the  
headphones to start the search  
for your desired channel.  
Is there another  
transmitter  
operating in  
Set the transmitter to a different  
channel and press the TUNE  
button 3 on the headphones.  
the proximity?  
The loudspeakers of your TV are muted  
Possible cause  
Solution  
Some TVs have a  
Via the operating menu of your TV,  
function that mutes check if and how the muting function  
the loudspeakers  
when you connect a  
transmitter.  
can be deactivated.  
Alternatively, use a different audio socket  
on your TV.  
If a problem occurs that is not listed in the above tables or if  
the problem cannot be solved with the proposed solutions,  
please contact your Sennheiser partner for assistance. For  
additional information on Sennheiser, please visit our website  
19  
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Accessories and spare parts  
Accessories and spare parts  
Only use original Sennheiser accessories and spare parts,  
otherwise the device quality can be impaired or the devices  
can be damaged.  
Cat. No. Accessory/spare part  
009932 1 HDR 125 additional headphones  
511791 1 pair of earpads  
Specifications  
RS 125 system  
Modulation  
FM, stereo  
Frequency range  
Frequency response  
Signal-to-noise ratio  
Ambient temperature  
863 – 865 MHz  
18 – 21,000 Hz  
typ. 68 dBA  
0°C to +40°C  
TR 125 transmitter  
Carrier frequencies  
Radiated RF power  
Power supply  
863.3 / 864.0 / 864.7 MHz  
10 mW  
9 V DC via NT-RS 100 mains unit  
Power consumption  
Channels  
< 1.8 VA  
3
Connector  
3.5 mm stereo jack plug  
20  
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Specifications  
TR 125 transmitter  
Weight  
approx. 430 g  
Dimensions  
(incl. charging cradle)  
approx. 85 x 133 x 225 mm  
(W x D x H)  
HDR 125 headphones  
Transducer principle  
Max. SPL (at 1 kHz)  
THD (at 1 kHz)  
dynamic, circumaural, closed  
104 dB  
< 0.5%  
Power supply  
2 AAA size NiMH rechargeable  
batteries (LR 03)  
Charging time  
Operating time  
approx. 16 hrs (full charge)  
up to 23 hrs (with fully charged  
rechargeable batteries)  
Weight  
approx. 275 g  
incl. rechargeable batteries  
NT-RS 100 mains unit  
Nominal input voltage  
Mains frequency  
230 V AC  
50 Hz  
Nominal output voltage 9 V DC  
Nominal output current 200 mA  
Operating temperature  
range  
0°C to +40°C  
Transmitters that operate in the 863 – 865 MHz frequency  
range can be used licence-free in the following countries:  
AT, BA, BE, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT,  
LI, LT, LU, LV, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, TR, UA.  
21  
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Manufacturer declarations  
Manufacturer declarations  
Warranty  
Sennheiser GmbH & Co. KG gives a warranty of 24 months on this product.  
For the current warranty conditions, please visit our web site at  
CE Declaration of Conformity  
0682  
This equipment is in compliance with the essential requirements and other  
relevant provisions of Directives 2006/95/EC and 1999/05/EC.  
Before putting the equipment into operation, please observe the respec-  
tive country-specific regulations!  
Rechargeable batteries  
The supplied rechargeable batteries can be recycled.  
Please dispose of them as special waste or return them to your  
specialist dealer. In order to protect the environment, only dispose  
of exhausted batteries.  
WEEE Declaration  
Your Sennheiser product was developed and manufactured with  
high-quality materials and components which can be recycled  
and/or reused. This symbol indicates that electrical and electronic  
equipment must be disposed of separately from normal waste at  
the end of its operational lifetime.  
Please dispose of this product by bringing it to your local collection point  
or recycling centre for such equipment. This will help to protect the environ-  
ment in which we all live.  
22  
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Index  
Index  
Headphones  
Adjusting the volume 15  
Automatic channel search 14  
Charging the headphones 10  
Cleaning 17  
Operating elements of the headphones 5  
Operating time 10  
Replacing the earpads 17  
Searching for a sound source 14  
Switching the acoustic signals on/off 16  
Switching the headphones on/off 13  
Rechargeable batteries  
Changing the batteries 9  
Charging indicator 6  
Charging the batteries 10  
Transmitter  
Changing the channel 15  
Cleaning 17  
Connection to a headphone socket 8  
Connection to a sound source 8  
Connection to the mains 9  
Installation 7  
Operating elements of the transmitter 5  
Switching the transmitter on/off 12  
Troubleshooting 18  
23  
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Sennheiser electronic GmbH & Co. KG  
Am Labor 1, 30900 Wedemark, Germany  
Printed in China  
Publ. 02/09  
532024/A01  
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