Sennheiser ew 300 iem Instructions for Use - Page 53
Care and maintenance
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Recommendations and tips ... for optimum reception ț Transmission rangedepends to a large extent on location and can vary from about 10 m to about 150 m. There should be a "free line of sight" between transmitting and receiving antennas. ț To avoid overmodulating the receiver, observe a minimum distance of 5 m between transmitting and receiving antennas. ț Observe a minimum distance of 50 cm between antennas and metal objects (such as cross members or reinforced-concrete walls). ... for multi-channel operation ț You cannot use all adjustable frequency combinations simultaneously. The factory-preset frequencies (presets), however, are intermodulation-free. If you wish to program new frequency combinations, please contact your local Sennheiser agent who will provide you with information on the correct frequency choice. ț When using several transmitters simultaneously, observe a minimum distance of 40 cm between transmitting antennas. ț Use special accessories for multi-channel applications (u "Accessories"). ț When using the ew 300 IEM system in combination with radiomicrophone systems, a minimum channel spacing of 8 MHz should be maintained to avoid RF breakthrough between systems. 8 Care and maintenance Use a damp cloth for cleaning the devices. Do not use any cleansing agents or solvents as these could damage the surface of the equipment. 55