Owners Manual
Page 27
... Another piece of equipment on is not in the subwoofer has blown (fused) 1. g. Disconnect and rotate the mains plug to eliminate the humming. With a "Dolby Digital" receiver (amplifier): the receiver is set too low 7. The microfuse in the "ON" position or the "AUTO" or "AUTO HIGH" positions 4. Ground loop (ripple pickup...
... Another piece of equipment on is not in the subwoofer has blown (fused) 1. g. Disconnect and rotate the mains plug to eliminate the humming. With a "Dolby Digital" receiver (amplifier): the receiver is set too low 7. The microfuse in the "ON" position or the "AUTO" or "AUTO HIGH" positions 4. Ground loop (ripple pickup...