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Important notes
Do not use the device:
• if the power cord or the plug are defective or damaged.
• if the device is not functioning properly or is defective.
• if the device has fallen or been damaged in any other way.
• Always make sure to pull the plug before attempting to clean
the device.
• To clean the device, simply use a soft, dry cloth – never use any
kinds of chemicals or water.
• Should a repair become necessary, have this done by an autho-
rized technician only.
3. Applications
The PRO LOOP C amplifier was designed for use in professional venues where high reliability
and safe operation are essential. The 100 % short-circuit-proof amplifier with programmable,
symmetrical XLR inputs and extremely stable output power meets these requirements. The
AGC function attenuates the signal level of such constant signals as oscillation and sine cur-
ves to - 10 dB, thus providing for consistent field strength and stable sound.
Inductive listening systems are used for different applications, e.g. for assisted listening for
the hearing impaired in churches, theaters, cinemas, waiting rooms and lounges, as interpre-
ting systems, for lectures in museums, exhibitions, etc.
3.1 How it works
The induction loop amplifier generates an alternating electromagnetic field around the loop
cable. The loop consists of an insulated wire, which is usually laid singly (or doubly) along
the side of the room. When the hearing-aid wearer set the hearing aid to the "T position",
voltage is induced into the T coil. This voltage depends on the amplifier's input signal. Now
the signals are amplified by the hearing aid and converted into sound. The alternating elec-
tromagnetic field inside the loop allows the hearing-aid wearer to move around freely in the
room and to receive the voice or music signals as high-quality, pleasant sound.
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