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B. If, after operating the woofer at high volume levels for a long time, the woofer cuts out or becomes
intermittent:
Your subwoofer has a protection circuit that protects it from overheating. After hours of continuous
operation at extremely high volume levels, this circuit may cut 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 the factory for advice.
C. If you are using the "FROM AMPLIFIER" terminals, and the subwoofer has very little output:
Make sure that the input cables are in phase. Reverse the ( + ) and the ( — ) connections for ONE
CHANNEL ONLY at the "FROM AMPLIFIER" terminals. If the problem remains, put the cables back as
they were. Then perform the test in Step 4 on page 10.
D. If the midbass range (the area of transition between Subwoofer and Satellite speakers) sounds weak:
Refer to Section 6, Phasing Test, on page 8. Reverse the ( + ) and ( — ) connections at the back of
BOTH Satellite speakers, OR switch the "PHASE" switch from ( + ) to ( — ) or vice versa. The wiring
configuration that gives the most bass is correct.
E. If you are using the "FROM PREAMP" input terminals, and you hear a thump through the Subwoofer
every time you turn the system on:
F. If you hear a persistent hum or buzz through the subwoofer:
Because the subwoofer reproduces 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 RCA 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.
To identify the source of hum, 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
coming from the subwoofer's speaker driver, the subwoofer is the source of the hum. If you hear no
hum or less hum, the problem is probably coming from another component.
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 amplifier or receiver, or reverse the polarity of its AC
plug. If these suggestions do not solve your problems, contact your dealer or M&K.
G. If there is an unusual sound coming from the subwoofer with no music playing:
Try removing the input cables as described in step 5 on page 10. If the noise disappears, it is coming
from another component. If it does not go away, contact your M&K dealer or the factory.
IF YOU NEED TO REPLACE THE EXTERNAL FUSE:
Disconnect supply cord before changing fuse. Replace fuse only with same type.
Remove the fuse cap and inspect the fuse. Look carefully at the fuse. If the wire filament inside the glass is bro-
ken, replace the fuse ONLY with one of the identical size and value. Using a fuse of a larger value will void your war-
ranty AND MAY CREATE A FIRE HAZARD. Plug the subwoofer back in. If it does not work, unplug it immediately, and
contact your dealer or M&K for service.
12. IF YOU NEED SERVICE
Contact your dealer or M&K. Please have the unit's model and serial numbers (found on the back of the cabinet),
date of purchase, the name of your dealer, and a complete description of the problem. You can call M&K between 8:30 AM
POWERED SUBWOOFER
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