Question about KLH BB-II Subwoofer
Problems like this are usually the result of one of two conditions, the lack of a properly grounded phono cable connection at either the amplifier or the sub. To help isolate this problem, try plugging the end that goes to the amp into a jack such as the Tape Out. If the hum goes away then there is a problem with the sub out. If the humming doesn't change then it is either the cable or the Sub itself.
The other condition is what is known as a difference in ground potential between the amp and the sub. If both components have grounded (3-pin) plugs you may have to isolate the ground of the sub by using a 2 to 3 prong adapter and ground the sub to your receiver.
Posted on Oct 15, 2008
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Posted on Jan 02, 2017
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Is the hum in the receiver-attached speakers or the sub?
How is the sub attached - RCA or speaker-level?
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.
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