Grundig APOLLO 2000 Handbuch Seite 9

SET-UP AND SAFETY
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The wireless transmission system
Your loudspeakers are equipped with an HF system which enables them to
transmit and receive audio and data signals without the need for cables.
The HF transmission strength is limited by national and international regulations
to prevent radio interference from neighbouring devices.
The HF transmission power is < 10 mW. This guarantees an unhindered
reception range of approximately 30 m. This range is restricted inside buildings,
depending on the construction materials used.
Avoid placing the loudspeakers near metal objects such as radiators or
electrical devices such as cordless telephones which use radio signals.
Since the audio and data signals are not transmitted on an exclusive range we
cannot guarantee that this will not cause interference. To avoid interference you
can change the communication channel for the audio signal.
In some circumstances, people, walls and other surfaces can reflect radio
signals. Reflected signals can mix with direct (non-reflected) signals thus causing
a type of interference known as multi-path reception. This can lead to noise or a
temporary loss of sound. If such interference does occur, simply position the
loudspeakers differently.
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