13
D
.
If you hear a persistent hum or buzz through the subwoofer:
1. Because the subwoofer is able to reproduce the 50 Hz or 60 Hz Mains frequency, it is often
blamed for causing hum that originates elsewhere in the system. Always avoid running all
speaker wires and phonos interconnect cables near to AC cords and component power supplies.
Wires and cables running close to AC lines are a common source of hum. If necessary, reroute
your cables.
2. To identify the source of a perceived hum or other noise, remove all input cables to the
subwoofer, but leave it plugged into the AC outlet. Carefully turn the “BASS LEVEL” control up
towards the “MAX” position. If you hear hum or other noise coming from the subwoofer, then the
subwoofer is the source of the noise. If you hear little or no hum coming from the subwoofer, then
the subwoofer is working properly and the problem is coming from another component.
3. Hum can also be caused by AC ground loops. If the subwoofer is plugged into a separate AC
outlet, try plugging it into the same outlet used for your receiver or processor. You might also try
reversing the polarity of the AC plug. If none of these suggestions solve the problem, contact your
M&K Sound dealer.
E
.
If unusual sounds come from the subwoofer with no music playing:
1. Try removing the input cable. If the sound disappears, the noise is coming from one of your
other components. If it does not go away, the subwoofer may have a problem. In this case,
contact your M&K Sound dealer.
14. IF YOU NEED SERVICE
Contact your M&K Sound dealer. Do not send your speaker to M&K Sound directly without
obtaining prior authorization.
