MK Sound MX350 MKII Operation Manual page 13

you hear sound coming from the subwoofer when you touch the connector, the subwoofer is
working. You need to look elsewhere in your system to solve the problem.
6. Make sure that all the cables in your system are OK. Double check all your connections. If
necessary, replace any defective cables.
B.
After operating the subwoofer at high volume levels for a long time, the subwoofer cuts
out or stops working or becomes intermittent:
1. Your subwoofer has a protection circuit that protects it from overheating. After hours of
continuous operation at extremely high volume levels, this circuit may shut off the power to the
subwoofer. When it activates, the sound may switch in and out rapidly, with a fluttering sound. If
this happens, unplug the unit and let it sit for at least half an hour. After that time, plug it back in. It
should operate normally. If you find this happens frequently, contact your MK Sound dealer.
C.
If you are using the "FROM AMPLIFIER" speaker wire terminals and the subwoofer has
very little output:
1. Make sure that the speaker wire connections are in phase. Try reversing the plus (+) and
minus (-) speaker wire connections on one channel only. If the problem persists, put the
connection back as it was. Repeat the phase test discussed earlier in this manual.
D.
If the mid-bass range – the area of transition between your subwoofer and satellite
speakers - sounds weak:
1. Refer to the section on phase testing discussed earlier in this manual. Try reversing the phase
switch from plus (+) to minus (-) (or vice versa.)
E.
If you hear a persistent hum or buzz through the subwoofer:
1. Because the subwoofer is able to reproduce the 60 Hz hum frequency, it is often blamed for
causing hum that originates elsewhere in the system. Always avoid running all speaker wires and
phono 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
MK Sound dealer.
F.
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 MK Sound dealer.
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