2. amps-preamps
  3. 1050007000

Another Issue with Hum.....Advice Needed

I know this has been beaten to death, but I recently introduced hum to my system, and am having a hard time figuring out how to resolve it.

I recently added to my sysyem an active subwoofer that is being fed a speaker level signal from my Receiver's front channel speaker outputs. When the receiver and subwoofer are both turned on, there is no hum. When I turn off all components except my subwoofer and 2 channel amp (I like to leave all amps on), a fairly loud hum can be heard from the subwoofer. The entire system was dead quiet before the sub was introduced to the system. This is not an issue when listening to music, but it is annoying and worrisome when the system is not in use (standby).

I should add that all components (Receiver, DVD player, CD Transport, DAC, etc. are all plugged into a VansEvers PLC and I have decent aftermarket power cords on most components, including the new sub. I suspect some sort of ground loop, but I have no idea how to resolve this. Any ideas would be apprciated.
ejresch

Showing 1 response by ejresch

ejresch OP
13 posts
 
Thanks a lot for the responses so far. One Audiophile, I think you are onto something. I know for sure that my Denon receiver uses relays for switching. This may be what is causing the hum.

I have another sub I only use for movies, and I think I'll hook it up to the receiver the same way as the other sub and see if the hum exists. If it does, I can assume that it is not the sub amplifier, and is most likely the receiver. Thanks again for your opinions.
More to discover