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11. TROUBLESHOOTING
Your M&K Sound subwoofer amplifier provides high reliability and, in the rare event service is ever required, easy modular
replacement of parts. This section of the manual will help you to solve or diagnose most problems that can occur with your
subwoofer. In the event that a fuse blows,
ALWAYS replace it with a fuse of the correct value to avoid malfunction of the unit or even a fire hazard. Use of an incorrect
fuse value will void your warranty.
A.
Your subwoofer has no output.
1. Make sure that the subwoofer is plugged into an AC outlet that you know is active and that is the power cord is securely
plugged into the back of the subwoofer.
2. Make sure that the “POWER” switch is set to the “AUTO” or “ON” position. If you hear no output with the switch set to
“AUTO”, move the switch to the “ON” position.
3. Check the “BASS LEVEL” control and make sure that it is set above the “MIN” position. Rotate it clockwise, if it is set to
the “MIN” position.
4. Check the Power ON LED on the subwoofer’s back panel. If the LED is not lit (usually blue), check the fuse. ALWAYS
unplug he subwoofer before changing the fuse. If the element inside the fuse is broken, replace the fuse with a new one of
the same value. If the new fuse blows immediately, contact your M&K Sound dealer.
5. If the Power LED is lit, but you still hear no sound, try this test: Disconnect the phono interconnect cable from the back of
the receiver or processor. Touch the tip of the connector. If 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. A
fter 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 M&K Sound dealer.
C.
If the mid-bass range the area of transition between your subwoofer and satellite speakers Sounds weak:
Refer to the section on phase testing discussed earlier in this manual.Try reversing the phase switch from plus (+) to minus
(-) (or vice versa.)
Summary of Contents for Professional Powered Subwoofer
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