Cerwin-Vega POWERED DESKTOP XD3 - Manual (Page 13)

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Check that the source (computer or portable media player) volume level is set
to a level that can properly send a signal to the monitors. Also verify that the
volume knob on the XD3 speaker is turned to the full clockwise position.
If the right speaker does not produce audio, than check both sides of the 2-
conductor wire that is connected to the left and right speaker. The ends of the
2-conductor wire must be bare wire (no insulation material) and inserted into
the push terminals.
Bad Sound
Verify that all audio related connections are securely attached. For example,
make sure the audio input connectors are clean and fully inserted into the jack.
Distorted or noisy sound can result from the source (computer or portable
media player). Try to listen to the source using a set of headphones and
adjusting the volume to different levels. If the audio is bad through the
headphones, than the source is the problem.
The position of the speakers can contribute to bad sound. Make sure the
proximity of the speakers is not restricted by other objects such as books or
being placed too close to the wall. Experiment by moving the XD3 speakers to
different positions.
Check that the wiring is not restricted and not in close proximity to electrical
interference sources such as power cords, mobile phones or dimming lights.