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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.
7. If there is an unusual sound coming from the Subwoofer with no music playing:
Try removing the input cables as described in Step 5 above. 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. If the fuse cap has an arrow printed on it, push the cap in and turn it counterclockwise. If the fuse
cap has a slot in it, use a flat head screwdriver to turn it counterclockwise. Look carefully at the fuse. If the wire filament inside
the glass is broken, replace the fuse ONLY with one of the identical size and value. USING A FUSE OF A HIGHER VALUE
WILL VOID YOUR WARRANTY 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.
11. 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 and 5:00
PM Pacific Time, Monday through Friday, at (818) 701-7010. If you call outside these hours, leave a message, and we will return
your call. Alternatively, you may send an e-mail to ser
vice@mksound.com.
DO NOT RETURN YOUR SPEAKERS TO THE FACTORY FOR
SERVICE WITHOUT OBTAINING PRIOR AUTHORIZATION
12. M&K 10 YEAR / 5 YEAR WARRANTY
All M&K powered subwoofers carry a five year limited parts and labor warranty on the amplifier and power supply, ten year
limited parts and labor warranty on the subwoofer driver. This warranty is transferable to subsequent owners up to five years
from the date of original purchase. It does not cover abuse, misuse, repairs by unauthorized service stations, speakers
without serial numbers, and speakers damaged in shipping or by accident. If you have any questions about the warranty,
please contact M&K.
13. CABINET MAINTENANCE
The painted black cabinet of your subwoofer has a furniture-grade finish that will maintain its attractive appearance with
proper care. Treat it as you would any piece of fine furniture. Regular cleaning is all that is required. Matching black paint can
be used to repair any surface damage.
14. SPECIFICATIONS
V-850 and V-851
POWER OUTPUT: 125 watts RMS
FREQUENCY RESPONSE: 20 Hz - 200 Hz ± 2dB
LOW-PASS FILTER: Variable from 50Hz - 125Hz
MAGNETICALLY SHIELDED: Yes
DIMENSIONS (HxWxD): 18” x 15.25” x 21.25”
WEIGHT: 52 lbs. (V-850)
50 lbs. (V-851)
POWERED SUBWOOFER
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