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On cleaning Clean the speaker cabinets with a soft cloth lightly moistened with a mild detergent solution or water. Do not use any type of abrasive pad, scouring powder or solvent such as alcohol or benzine. The volume level should not be turned up to the point of distortion. If the volume level is too high, the speaker protection circuit activates, and the sound level drops suddenly. This is not a malfunction. In this case, lower the volume level and wait for a few moments until the unit resume