Where can i buy Sennheiser Audiology headsets from?
Sennheiser U.K distribute all of its Audiology headsets through a company called Bioacoustics. Bioacoustics offer technical/specialist advise to those that need it and also mail order facilities to those that wish to purchase a Sennheiser headset.

Bioacoustics Ltd
26 Guildford Street
Luton
LU1 2NR
Tel: 01582 431000

I'm looking for Sennheiser TV headphones which I can use with my hearing aid.
Sennheiser offers special infrared or RF wireless clip-on receivers, which are connected to your hearing aid by means of a connection cable or transmit the TV sound via an induction neck loop.



I use a Sennheiser TV system - how can my partner hear the TV?
On most TVs, the loudspeaker volume is independent from the level at the headphone output ? to which you have connected your system transmitter. Alternatively, you could also use an additional Sennheiser headphone receiver. These are available separately.



Can I use my RF wireless headphones wherever I am?
You can use your Sennheiser RF wireless headphones nearly everywhere (but they aren't meant for underwater use, and we haven't done a space test yet, either!) but please consider that you may not be allowed to use them everywhere. Different countries have different RF approval requirements. Please check your instructions for use or contact our local partner. Some areas, such as hospitals or airplanes, may also have special restrictions.



What is the difference between infrared and RF wireless transmission?
With infrared transmission, the audio signal is "carried" from the transmitter to the receiver via beams of invisible infrared light. RF transmission uses electromagnetic waves, similar to a radio set.
Infrared light cannot pass through walls, therefore, transmitter and receiver have to be in the same room. A direct line of sight would be ideal, but is not always required as the signal is also reflected by walls and ceiling. These reflections are sufficient for reception.
For radio waves, walls and ceilings are no obstacle ? they simply pass through them. With an RF system you can therefore listen within a range of up to 100 m, there's no need to be in the same room as the transmitter! Sennheiser RF wireless systems always have two or three transmission frequencies to choose from. This ensures that simultaneously used systems will not interfere with one another.



Can headphones be dangerous?
Headphones are not dangerous but incorrect usage may cause problems. Listening too long to high volumes can cause hearing damage ? from any source. The longer you listen the lower the volume should be. An official recommendation is max. 85 dB SPL if you listen longer than 8 hours. If you can't measure the volume please use this rule of thumb: While listening to (open) headphones, people should still be able to talk to you without shouting. Please also consider that cutting out surrounding sound may be dangerous in some situations such as in traffic (bicycling, etc.) or while taking care of a baby.

Humans always are suspicious towards everything they can't perceive. Wireless transmission has been analyzed intensively. The frequencies and the output power of Sennheiser wireless products are within limits where no dangerous effects on humans are known (even for people wearing hearing aids or cardiac pacemakers). We do intensive research before launching new technologies and work together with consumer protection associations, universities and government project groups.



Sennheiser has so many different headphones, how will I know which one is the right one for me?

In addition to the recommendations of Sennheiser and the technical product information, only your ears can give you the right answer.
Everybody perceives sound differently due to ear shape, cultural influences, habits, etc. Whenever you think about buying a good headphone set, make sure that you listen to it before you buy it. Use music you know very well, but make sure it is music that contains different instruments and voices with different volume levels. Sometimes audio magazines have good test CDs (skip the tracks speci fi cally for loudspeaker s ). Some headphones include processors to change the original signal deliberately to obtain a surround sound impression (like the RS 65). Try them with and without the encoding to get a proper impression. But please remember that the algorithms are made for music and vocals, so pure test signals may sound strange.
Humans do not have an acoustical memory. It is only through experience and a few "tricks" that sound engineers (or other professionals) can remember how a headphone sounds. The easiest thing for you is to compare the new headphones with old ones or speaker sound.

I have bought wireless headphones to listen to the TV at a greater volume than my family. But when I plug the transmitter into my TV, the TV speakers are switched off completely. Can you help me?

Instead of using your TV's headphone output, you should use the SCART socket which provides a separate audio signal. Sennheiser offers a special SCART/1/4" jack cable (order No.: 47874) for this purpose. Use an additional adapter to 3.5 mm (1/8") jack to connect the cable to your transmitter.

Alternatively, you could use the RCA phono outputs of your television set. Sennheiser offers an RCA phono/3.5 mm jack adapter under order No. 72415.



I wear a hearing aid and want to use the Sennheiser RI 250 S infrared receiver. Which cable do I need for connecting the receiver to my hearing aid?

Please use an HZL 34-6E cable. If you have binaural hearing aids, use the HZL 36-6E.