RS 2400 - Wireless Headphones SENNHEISER - Free user manual and instructions

Product type	Wireless stereo RF headphones
Brand	SENNHEISER
Model	RS 2400
Transmission technology	FM stereo, radio frequency (RF)
Maximum range	Up to 100 m in free field
Bandwidth	50 - 12,000 Hz
Harmonic distortion	< 1%
Signal-to-noise ratio (transmitter)	70 dB(A)
Signal-to-noise ratio (receiver)	65 dB(A)
Power supply transmitter	12 V DC via power adapter (included)
Power supply receiver	NiMH battery 2.4 V (type BA 151)
Battery life receiver	About 4 hours with one battery
Charging time	3 times the usage time (e.g., 1 hour listening = 3 hours charging)
Weight transmitter	Approx. 170 g (without power adapter)
Dimensions transmitter	134 x 87 x 33 mm
Connectors transmitter	Audio input: 3.5 mm stereo jack
Main functions	Individual volume control, tuning (TUNE), auto power-on, standby, integrated battery charging
Included accessories	1 TR 2400-8 transmitter, 1 RR 2400-8 receiver, 1 BA 151 battery, 1 power adapter, 1 audio cable with 3.5/6.3 mm adapter, 1 plastic tube for antenna, 2 spare ear cushions
Maintenance	Clean with a slightly damp cloth; ear cushions washable in soapy water or replaceable
Safety	Do not open the devices; do not expose to heat or sunlight; respect volume to protect hearing
Spare parts available	BA 151 battery, ear cushions, additional RR 2400-8 receiver
General information	RF stereo system for TV listening without disturbing; compatible with any audio source with headphone output; unlimited number of receivers possible

Frequently Asked Questions - RS 2400 SENNHEISER

How to install the Sennheiser RS 2400 transmitter?

Place the transmitter near the TV. Connect the 3.5 mm jack plug to the headphone output of the audio source. Plug the supplied power adapter into the transmitter and a mains outlet. Extend the wire antenna and attach the plastic tube over it. Avoid placing the transmitter directly on the TV or near metal objects parallel to the antenna.

How to charge the receiver's battery?

Insert the receiver or a spare battery into one of the charging compartments on the transmitter. Charging works even if the transmitter is in standby, as long as it is plugged in. Before first use, charge the battery for 24 hours. The charging time is approximately 3 times the usage time.

What to do if no sound is heard?

Check the connection from the transmitter to the audio source and ensure the source volume is high enough. Make sure you are within range of the transmitter. Verify that the receiver is tuned to the same frequency as the transmitter (use the TUNE button). Finally, recharge the receiver's battery if it is depleted.

How to adjust the frequency between transmitter and receiver?

Turn on the transmitter and receiver. Select a channel on the transmitter using the switch (10). Set the receiver volume to a medium level (positions 3-4). Turn the TUNE potentiometer (7) on the receiver until the audio signal is heard clearly. The AFC circuit automatically stabilizes the frequency.

Can I use multiple receivers with one transmitter?

Yes, an unlimited number of receivers can operate with one transmitter. Each receiver must be tuned to the same frequency as the transmitter. If using multiple transmitters, maintain a minimum distance of two meters between them and select different channels to avoid interference.

Can I use the headphones outdoors?

Yes, you can use the receiver in the garden in dry weather. The range can reach up to 100 m in free field, but walls and ceilings reduce the range. Avoid getting the system wet and do not use it in the rain.

How to clean the headphones and transmitter?

Use a slightly damp cloth to clean the transmitter and receiver. Never use solvents. The ear cushions can be washed with soapy water, but it is recommended to replace them with new ones for hygiene reasons. Spare ear cushions are available as accessories.

What to do if the battery does not charge?

Ensure the transmitter is plugged in and the battery or receiver is correctly inserted into the charging compartment. Check that the transmitter LED lights up red or yellow during charging. If the battery is completely discharged (deep discharge), it may no longer be rechargeable. Replace it with a new battery of type BA 151.

Is it dangerous for health to use this wireless headphone?

No, according to scientific studies, the radio waves emitted by this device pose no danger to health. Moreover, the system uses rechargeable batteries instead of disposable ones, which is more environmentally friendly. However, be careful not to set the volume too high to protect your hearing.

What accessories are available for the RS 2400?

Accessories include: a BA 151 spare battery for extended operating time, an L 151-2 charger for charging two batteries simultaneously, an additional RR 2400-8 receiver, and spare ear cushions. All these items are available from your Sennheiser dealer.

USER MANUAL RS 2400 SENNHEISER

RS 2400

AUTOMATIC SWITCH-ON

RS 2400

Thank you for choosing Sennheiser! We have designed this product to give you reliable operation over many years.

Please take a few moments to read these instructions carefully, as we want you to enjoy your new Sennheiser product quickly and to the full.

AREA OF APPLICATION

With the RS 2400 stethoset receiver system you can listen to high-quality stereo TV sound without disturbing others. The RS 2400 has been specially designed for this purpose but can also be used with any other sound source fitted with a headphone socket.

FEATURES

• Lightweight stethoset receiver, comfortable to wear - Ease of use - Receiver powered by environmentally friendly NiMH rechargeable accupack • Volume can be set directly on the receiver - Transmitter with special charging compartments for simultaneously charging an accupack inserted in the receiver and an additional spare accupack - Plug-in mains unit available for different mains voltages • Transmitter with special AF input filter to protect against interference

SYSTEM COMPONENTS AND OPERATING ELEMENTS

WIRELESS RF TRANSMISSION TECHNOLOGY

With this RF stethoset receiver system you can move around freely in the home or outside in the garden without the constrictions of a cable! The RS 2400 will transmit the stereo sound signal from your TV set to the stethoset receiver.

It is not necessary that transmitter and stethoset receiver are in a direct line of sight. With an unobstructed RF link, the distance between transmitter and receiver can be up to 100 m. Transmission will remain clear and intelligible.

Walls and ceilings impede the propagation of radio waves and the range will decrease. Major obstacles for radio waves are metal parts as e.g. in concrete constructions or wall coverings, as they reflect radio waves before these reach the receiver.

One transmitter can supply several receivers.

For up-to-date information on Sennheiser products, you can also visit the Sennheiser Web site at “http://www.sennheiser.com”.

WHERE TO PLACE THE TRANSMITTER

Choose a suitable place near your TV set.

ATTENTION!

Some furniture surfaces have been treated with varnish, polish or synthetics which might cause stains when they come into contact with other synthetics. Despite a thorough testing of the synthetics used by us, we cannot rule out the possibility of discolouration, since we don't know your furniture. You should therefore always place the transmitter on a non-slip pad.

Use the supplied cable to connect socket 8 on the transmitter to the headphone socket of your sound source. The cable is fitted with a 3.5 mm jack plug suitable for most headphone sockets. For connection to 1/4" (6.3 mm) headphone sockets, use the supplied adaptor. Connect the plug-in mains unit to socket 9 on the transmitter and plug the mains unit into a wall socket.

ANTENNA

The wire antenna is an integral part of the transmitter. For best transmission the antenna should be vertical. You can therefore

▶ leave the wire antenna dangling in a vertical position down behind the transmitter or (the better option) slide the supplied plastic tube over the antenna and snap it into the clamp 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 your TV set as it might interfere with the transmitter. Test where exactly in the room the transmitter works best.

The transmitter features a convenient automatic on/off function. When an audio signal reaches the transmitter, it is switched on and the LED ② at the front of the transmitter lights up green. The LED ② also indicates that an accupack is being recharged. When a stethoset receiver or an accupack is inserted into a charging compartment, the LED lights up red.

Green LED = Transmitter ON

Yellow LED = Transmitter ON, Accupack recharging

Red LED = Accupack recharging

LED not lit = transmitter OFF

If 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 1 and 3) is independent of the automatic on/off function. Accupacks can always be recharged when the transmitter is connected to the mains. When you are not going to use the transmitter for some time (e.g. when you are on holiday), you should unplug the mains unit and take the stethoset receiver and the accupack out of their respective charging compartments.

ADJUSTMENTS ON YOUR TV SET

Please refer to the instruction manual of your TV set to find out whether the volume control also adjusts the headphone output or whether this output has a separate volume control. You will also find instructions on how to switch off the main loudspeakers.

OPTIMUM MODULATION LEVEL OF THE TRANSMITTER

▶ First, set the volume of your TV set to a medium value.

Charge the accupack for 24 hours before you use it for the first time!

Take your stethoset receiver out of the charging compartment 1 on the transmitter. Have you charged the accupack separately from the stethoset receiver?

Then insert the accupack into compartment 6 in the receiver.

SWITCHING ON THE RECEIVER

Use control 5 to switch on the receiver and adjust the volume.

ADJUSTING THE RECEIVER CHANNEL

Transmitter and receiver have to operate on the same frequency:

Put the transmitter and the receiver into operation as described above. Switch on the TV set! If possible, switch off its loudspeakers. ▶ Use switch 10 on the transmitter to select a transmission channel. ▶ Set the volume control ⑤ on the receiver to a medium value (position 3–4). Slowly turn control ⑦ (“TUNE”) on the stethoset receiver until you can hear the audio signal loud and clear. The receiver’s AFC (Automatic Frequency Control) circuitry stabilises your adjustment.

Transmitter and receiver are now operating on the same frequency.

Your neighbour also likes listening with radio headphones? No problem! With switch 10, you simply select a different transmission channel on each transmitter. Then set the stethoset receivers to the respective frequencies (with control 7, as described above). Observe a minimum distance of 2 m between two transmitters.

Due to the required approval two channels are selectable:

Positions 1 or 3 = channel 1 Position 2 = channel 2

IMPORTANT!

Only use the transmitter with a suitable Sennheiser mains unit. Always disconnect the mains connector when you wish to change connections or move the device to a different place. ▶ Never open electronic devices! This must only be done by authorised personnel and is all the more valid for repairs on current-carrying units. Keep the system away from central heating radiators and electric heaters. Never expose it to direct sunlight. ▶ Use the system in dry rooms only. Transmitter and plug-in mains unit should always remain indoors. You can use the stethoset receiver outside if the weather is dry. Use a damp cloth for cleaning the transmitter and the stethoset receiver. Do not use any solvents. For reasons of hygiene, the ear-cushions can be cleaned with soapy water. We recommend, however, to simply replace them (inexpensive replacement ear-cushions are available as accessories). ▶ Vanish or furniture polish may degrade the rubber feet of the transmitter. Place the transmitter on a nonslip pad to avoid potential staining of furniture.

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.

WHAT TO DO IF ...

... the volume is up but you cannot hear anything:

... the sound is distorted:

... the sound is slightly noisy:

... you can hear twittering and chirping, and the sound is “squeezed”:

... the transmitter switches off during operation:

There is no audio signal available. Check the transmitter connection. Is the volume at the headphone socket of your sound source sufficient? Are you still within the transmitter's range? Is the receiver on the same frequency as the transmitter? The receiver accupack has gone flat, please recharge it immediately. The volume on the receiver is adjusted too high. Reduce the volume. ▸ You are about to leave the transmitter's maximum range. Soon transmission will be interrupted completely. The transmitter's modulation level is too low. Increase the volume on your sound source. ▶ Two transmitters are interfering! Choose a different transmission channel. The volume on your TV set is adjusted too low. Adjust the volume on the TV set such that the LED on the transmitter blinks occasionally.

ACCESSORIES

BA 151

L 151-2

RR 2400-8

Rechargeable accupack as a spare, for use when the supplied accupack is being recharged.

Charger for recharging two BA 151 accupacks (recommended when more than two stethoset receivers are used with one transmitter).

Additional stethoset receiver

RECHARGEABLE ACCUPACKS HAVE A "CHARGING CYCLE"

The charging time of the accupack 4 depends on how long you have used your stethoset receiver. General rule:

OPERATING TIME x 3 = CHARGING TIME

Example:

listening: 1 hr recharging: 3 hrs

listening: 2 hrs recharging: 6 hrs

Listening: 3 hrs; recharging: 9 hrs

RECHARGING THE BA 151 ACCUPACK

Do not let the rechargeable accupacks become completely flat. If you do, they will be exhausted and cannot be recharged (“total discharge”). This happens e.g. when flat accupacks remain uncharged for some time. Please observe the following three rules:

If you notice that the accupack is going flat, switch off the stethoset receiver and recharge the accupack immediately. If you have a spare accupack you can use it in the meantime. Immediately recharge the accupack after each use, no matter whether it is fully or only partly discharged. ▶ Charge the accupack for 24 hours before you use it for the first time!

Please note: With both charging possibilities, the accupacks are also recharged when the transmitter is switched off but remains connected to the mains.

ENVIRONMENT AND HEALTH

Devices powered by rechargeable accupacks are environmentally friendly. This energy source can be recharged many times. Conventional batteries, on the other hand, must be disposed of as special waste after they have been used just once. If an accupack should be defective or has been damaged due to total discharge, it is then recycled – the dealer who sold it to you will take it back and will also supply you with a new, original Sennheiser accupack. (Recycling methods differ in different countries.)

According to today's scientific knowledge, the radio waves emitted by this device are by no means harmful.

TECHNICAL DATA

Modulation

Range

Audio frequency response

THD

Frequency range

RS 2400 SYSTEM

FM stereo

up to 100 m

50-12,000 Hz

< 1 %

see type plate located on the bottom

TR 2400 TRANSMITTER

Power supply

Power consumption

RF output power

Signal-to-noise ratio

Audio connector

Input sensitivity

Weight / Dimensions

12 V DC via plug-in mains unit

approx. 1 VA

typ. 10 mW

70 dB(A)

3.5 mm stereo jack plug + 1/4" (6.3 mm) adaptor

typ. 80 mV, automatic limiter system

approx. 170 g (w/o plug-in mains unit) / 134 x 87 x 33 mm

RR 2400 STETHOSET RECEIVER

Signal-to-noise ratio

Max. sound pressure level

Power supply

Current consumption / Operating time

Weight

65 dB(A)

typ. 110 dB

via BA 151 rechargeable accupack, 2.4 V

typ. 20 mA / approx. 4 hrs per accupack

approx. 45 g incl. accupack

SUPPLY SCHEDULE

1 TR 2400-8 transmitter

1 RR 2400-8 stethoset receiver

1 BA 151 rechargeable accupack

1 plug-in mains unit, 12 V DC, for 230, 120 or 240 V mains voltage

1 connection cable with 3.5 mm / 1/4" (6.3 mm) jack plug adaptor

1 instructions for use

1 plastic tube for antenna

1 pair of replacement ear-cushions

RS 2400

WIRELESS TRANSMISSION TECHNOLOGY

Red LED = battery charged

SIMULTANEOUS USE OF MULTIPLE SYSTEMS

IMPORTANT NOTES

approx. 45 g, including battery

CONTENTS

RS 2400

WIRELESS TRANSMISSION TECHNOLOGY

TURNING ON THE RECEIVER

RS 2400

SIMULTANEOUS OPERATION OF MULTIPLE SYSTEMS

1 receiver RR 2400-8

1 battery BA 151

RS 2400

WIRELESS AUDIO TRANSMISSION

SWITCH-ON MECHANISM

MULTIPLE INSTALLATIONS IN USE AT THE SAME TIME

12 V DC via power adapter

approx. 1 VA

typically 10 mW

70 dB(A)

conform to the basic requirements of EEC Directive 89/336/EEC resp. R&TTE Directive 1999/5/EC. To effect correct application of the requirements stated in the EEC Directives, the following standards were consulted:

Subject to alterations

30900 Wedemark, Germany

www.sennheiser.com

Printed in Ireland

Publ. 07/03

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Fax [phone]

86025 / A02