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Sending the signal through certain materials, such as glass, tile, and metal, can decrease the effective transmitting distance of the system. Distorted sound • High-output sources, such as DVD players or audio receivers/amplifiers, may cause distortion if used at full volume with the transmitter. Try setting them at 1/2 or 2/3 volume. Indicators fail to light up • Make sure the headphones are charged and that the transmitter is properly connected to the audio source. Move the headphones closer t