Sennheiser RS 4 User manual

RS 4
RS 4-9
BEDIENUNGSANLEITUNG
INSTRUCTIONS FOR USE
NOTICE D‘EMPLOI
ISTRUZIONI PER L‘USO
INSTRUCCIONES PARA EL USO
GEBRUIKSAANWIJZING

13
RS 4 / RS 4-9
Thank you for choosing Sennheiser! You have made an excellent choice. This product will give you reliable
and cost-effective ease of operation over many years. All of Sennheiser´s professional expertise and more
than fifty years of experience have gone into the creation of this state-of-the-art product.
Please take a few moments to read these instructions carefully. We want you to enjoy your new wireless
headphones quickly and to the full.
Versions
RS 4 RF transmission on 433.40 ... 434.50 MHz
(European version)
RS 4-9 RF transmission on 924.80 ... 926.50 MHz
(North-American version)
Features
앫Lightweight headphone, comfortable to wear
앫Excellent sound quality
앫Easy to operate
앫The headphone operates on environmentally friendly rechargeable
accuplugs (nickel-metal hydride)
앫Volume can be set directly on the headphone
앫Up to two accuplugs can be recharged in special compartments in the transmitter
앫Plug-in mains unit available for different operating voltages
앫Transmitter in a designer housing
앫Three switchable transmission channels allow simultaneous operation of
several systems
앫Insensitive to interference due to special RF input filter

14







System components and operating elements

15
Wireless RF transmission technology
With this headphone system you can move around freely in the home or outside in the garden without
the constrictions of a headphone cable! The RS 4 will transmit the stereo sound signal from your hi-fi
system or any other sound source to the headphone receiver.
The Sennheiser system operates on a carrier frequency of approx. 434 MHz (RS 4) or approx. 926 MHz
(RS 4-9), respectively. This frequency band has been licensed by the respective telecommunications
authoritiesfor“non-commercialuse”,andapartfromwirelesssoundtransmission,itisalsousedforremote
controls etc. (Please note: because of this, occasional interference may be experienced from e.g. car alarm
radio keys.)
The maximum distance between transmitter and receiver should not exceed 100 m. Walls and ceilings are
(almost) no obstacle, since radio waves travel through them. Transmission will remain clear and
intelligible, and it is not necessary that transmitter and headphone receiver are in a direct line of sight. The
onlyobstacleforradiowavesaremetalpartsas e.g. in concrete constructions orwallcoverings. They reflect
radio waves.
Ifseveral wirelessRS 4headphone systems
are operated simultaneously and are very
close to one another (e.g. on the next
floor, at a neighbour´s, or on the other
side of the street) you have to agree on
usingdifferent channels. For this purpose,
theRS4systemfeatures threetransmission
channels, so everybody can transmit the
music they want to listen to.

16
Where to place the transmitter
Choose a suitable place near your hi-fi system.
Putting the transmitter into operation
왘Use the supplied cable to connect socket on the transmitter to the headphone output socket of your
hi-fi system. The cable is fitted with a 3.5 mm jack plug suitable for most headphone output sockets.
For connection to 1/4" (6.3 mm) headphone outputs, use the supplied adaptor.
왘Connectthe plug-in mains unit to socket onthe transmitter and plug the mains unitintoa wall socket.
Antenna
The wire antenna is an integral part of the transmitter. For best transmission the antenna should be vertical.
You can therefore
왘leave the wire antenna dangling
in a vertical position down
behind the transmitter - or
왘(the better option) slide the sup-
plied plastic tubing over the an-
tenna and snap it into the clamps
at the back of the transmitter:
Make sure that there are no metal objects such as shelf bars or lamp stands in parallel with the antenna.
Do not place the transmitter on a TV set as it might interfere with the transmitter. Test where exactly in
the room the transmitter works best.
Automatic on/off switching
The transmitter features a convenient automatic on/off function:
왘When an audio signal reaches the transmitter, it is switched on.
왘If there is no audio signal for about 3 minutes, the transmitter automatically switches off. The
transmitter is now in stand-by mode, its power consumption is very low so that it can remain connected
to the mains.
Important
The transmitter’s charging function (charging compartments ) is independent of the automatic on/off
function. Accuplugs can always be recharged when the transmitter is connected to the mains.

17
Putting the receiver into operation
Insert the BA 151 rechargeable accuplug into the battery compartment on the headphone receiver.
Switching the headphone receiver on
Switch on the headphone receiver and adjust the volume with control .
Adjusting the receiver channel
Transmitter and headphone receiver have to work on the same frequency:
왘Put the transmitter and the headphone receiver into operation as described above. Switch on the signal
source! If possible, switch off its loudspeakers.
왘Select a transmission channel (1, 2 or 3) on the transmitter with switch .
왘Adjust the volume control on the headphone until you can hear a low hissing.
왘Slowly turn control ("TUNE") on the headphone until you can hear the audio signal loud and clear. The
receiver’s AFC (Automatic Frequency Control) circuitry stabilises your adjustment.
Transmitter and headphone receiver are now operating on the same frequency.
Simultaneous operation of several systems
Your neighbour also likes listening to music with an RS 4? No problem! With switch , you simply select
a different channel on each transmitter. Then set the headphone receivers to the respective frequencies
(with control , as described above). Observe a minimum distance of 2 m between two transmitters.

18
Adjustments on your hi-fi system
왘Please refer to the instruction manual of your hi-fi system to find out whether the volume control also
adjusts the headphone output or whether the output has to be regulated separately. You will also find
instructions on how to switch off the loudspeakers.
Optimum modulation level of the transmitter
왘First, set the volume of your hi-fi system to a medium value.
왘The T 4 transmitter is fitted with an automatic modulation control which prevents overmodulation of
the transmitter. The green LED on the front panel indicates optimum modulation. Now adjust the
volume on the hi-fi system such that the LED blinks in time with the music, this indicates the correct
transmission level.
Important!
왘Only use the transmitter with the suitable Sennheiser mains unit included in the supply schedule.
Always disconnect the mains plug when you want to change connections or move the device to a
different place.
왘Neveropenelectronic devices! This must only be done by authorised personnel and is all the more valid
for repairs on current-carrying units.
왘Keep the system away from central heating radiators and electric heaters. Never expose it to direct sunlight.
왘Use the system in dry rooms only. Transmitter and plug-in mains unit should always remain in the
home. You can use the headphone receiver outside if the weather is dry.
왘Use a damp cloth for cleaning the transmitter and the headphone receiver. Do not use any cleansing
agents or solvents.
Volume up? - No!
When people use headphones, they tend to choose a higher volume than with loudspeakers. Listening at
high volume levels for a long time can lead to permanent hearing defects. Please protect your hearing,
Sennheiser headphones also sound exceptionally good at low volumes ...

19
What to do if ...
... the volume is up but you 왘There is no audio signal available. Check the transmitter
cannot hear anything: connection. Is the volume at the headphone socket of your
hi-fi system or TV sufficient?
왘Are you still within the transmitter’s range?
왘Is the receiver on the same frequency as the transmitter?
... the sound is distorted: 왘The headphone accuplug has gone flat, please
recharge it immediately.
... the sound is slightly noisy: 왘You are about to leave the transmitter’s maximum range.
Soon transmission will be interrupted completely.
왘The transmitter’s modulation level is too low. Increase
the volume on your hi-fi system (see also page 18).
... you can hear twittering and 왘Two transmitters are interfering!
chirping, and the sound is “squeezed”: Choose a different transmission channel.
Accessories
The following items are available to complement your system:
•BA 151 Rechargeable accuplug as a spare, for use when
the supplied accuplug is being recharged
•L 150 Charger for recharging additional BA 151
accuplugs (recommended when more than two
headphone receivers are used with one
transmitter)
•HDR 4 or HDR 4-9 Additional headphone receivers

20
Charging cycle of rechargeable batteries
The charging time of your accuplug depends on how long you have used the headphone receiver.
General rule:
Operating time x 3 = charging time
Example:
listening: 1 hr listening: 2 hrs listening: 3 hrs
recharging: 3 hrs recharging: 6 hrs recharging: 9 hrs
Recharging the ba 151 accuplug
Do not use rechargeable batteries until they are completely flat. If you do, they will be exhausted and
cannot be recharged. This happens e.g. when flat accuplugs remain uncharged for some time. Please
observe the two following rules:
왘If you notice that the accuplug is going flat, turn off the headphone and recharge the battery immediately.
If you have a spare accuplug you can use it in the meantime.
왘Immediately recharge the accuplug after every use, no matter whether it is fully or only partly discharged.
왘Before using the accuplug for the first time, you should charge it for 24 hours in the transmitter’s charging
compartment .
Please note: the accuplug is also recharged when the transmitter is switched off but remains
connected to the mains.
Environment and health
Devices which operate on rechargeable batteries are environmentally friendly. They can be recharged
many times whereas standard batteries are hazardous waste after use. In case an accuplug is defective or
has been damaged due to exhaustive discharge, it can be recycled. Just return it to your specialist dealer.
Here you can also get new Sennheiser accuplugs.
According to today’s scientific knowledge, the radio waves emitted by this device are by no means harmful.

21
Technical data RS 4 system
Modulation FM stereo
Range up to 100 m
Audio frequency response 20 - 19,500 Hz
THD ‹ 1 %
T 4 transmitter
Power supply 12 V DC via plug-in mains unit NT 92
Power consumption of transmitter approx. 1 VA
RF output power typ. 1.2 mW
Signal-to-noise ratio typ. 70 dB
Frequencies T 4 433.40MHz, 434.13MHz, 434.50MHz (channelsswitchable)
Frequencies T 4-9 924.80MHz, 925.80MHz, 926.50MHz(channelsswitchable)
Audio input voltage / Audio connector 10 mV - 3 V / 3.5 mm stereo jack plug + 1/4" (6.3 mm) adaptor
Charging compartments 2, for BA 151
Weight / Dimensions approx. 90 g (without plug-in mains unit) /134 x 87 x 33 mm
HDR 4 headphone receiver
Transducer principle open
Signal-to-noise ratio › 65 dB
Max. sound pressure level 103 dB
Tuning range HDR 4 433 - 435 MHz, stepless
Tuning range HDR 4-9 923.1 - 927.0 MHz, stepless
Power supply via BA 151 rechargeable accuplug, 2.4 V
Current consumption / Operating time approx. 18 mA / approx. 3.5 hrs per accuplug
Weight / Dimensions approx. 160 g incl. accuplug / 150 x 80 x 200 mm
Supply schedule 1 T 4 or T 4-9 transmitter
1 HDR 4 or HDR 4-9 headphone receiver
1 BA 151 rechargeable accuplug
1 plug-in mains unit, 12 V DC, for 230, 120 or
240 V mains voltage
1 connection cable with 3.5 mm / 6.3 mm (1/4") jack plug adaptor
1 Plastic tubing
1 RCA adaptor stereo (US-Version only)
1 instructions for use

22
RSS 210 manuel statement Operation is subject to the following two conditions:
This device may not cause interferences and
This device must accept any interference, including
that may cause undesired operation of the device.
Privacy of communications may not be ensured when
using this telephone.

62

왘Diese Anleitung ist genau so groß wie die Hülle einer CD. Stellen Sie sie mit in Ihr CD-
Aufbewahrungssystem. So ist sie immer schnell zur Hand, wenn Sie etwas nachlesen möchten.
왘These operating instructions are the size of a CD jewel box. If you keep it with your CDs, it will always
be at hand when you need to look something up.
왘Cette notice d’emploi a été fait dans le format d’un étui CD, alors vous pouvez la ranger avec vos CDs.
Ainsi, vous l’avez toujours à votre portée si vous voulez vous y référer.
왘Queste istruzioni hanno dimensioni esattamente uguali a quelle di una custodia di un CD. Collocatele
con il Vostro sistema di custodia dei CD. Essi saranno così sempre a portata di mano qualora si voglia
consultare qualcosa.
왘Estas instrucciones son de tamaño tan grande como el del forro de un CD. Guárdelas en el mismo sitio
donde conserva los CD, para tenerlas siempre a mano cuando desee consultarlas.
왘Deze handleiding is even groot als de hoes van een CD. Bewaar deze in het opbergsysteem voor uw
CD’s. Dan heeft u hem altijd bij de hand, voor het geval u iets na wilt lezen.
Änderungen vorbehalten
Subject to alterations
Sous réserve de modification
Con riserva di modifiche
Reservado el derecho a introducir modificaciones
Wijzigingen voorbehouden
Sennheiser Ireland GmbH Telefon [phone]
D-30900 Wedemark Telefax 05130/600-300
Printed in Ireland Publ. 03/99 78348 / A01