holabird Posted February 16, 2007 Share Posted February 16, 2007 Help, I have a RW 12 powered sub and it has developed a humming noise. It makes this noise when the receiver is not on. Any suggestions. Thanks Quote Link to comment Share on other sites More sharing options...
SteelerFan Posted February 16, 2007 Share Posted February 16, 2007 Cheater plug. Quote Link to comment Share on other sites More sharing options...
DrWho Posted February 16, 2007 Share Posted February 16, 2007 Sounds like a ground loop. While a cheater plug may work - it is not the safest option available. I have used and still use them all the time, but knowing full well that I might receive a shock (which has happened a few times). Cheater plugs are just band-aids that cure the symptoms, not the problem. Can you get the hum to go away by unplugging others things from the receiver while it's turned off? Are your sub and receiver plugged into an outlet on the same circuit breaker? The typical culprit for ground loups in the home is the coax cable feeding your cable/satellite TV. I would start by unplugging anything from the receiver that also connects to the tuner. If that doesn't help, then just starting unplugging things one at a time systematically until you can get rid of the hum. Once you find the problem, then it'll just be a matter of implementing the proper fix. Quote Link to comment Share on other sites More sharing options...
LoudnClear Posted February 17, 2007 Share Posted February 17, 2007 Hums when off? Have you checked the interior of the subwoofer for bees? Perhaps you might find some natural honey to enjoy with tea and crumpets duing listening this evening. Quote Link to comment Share on other sites More sharing options...
mas Posted February 17, 2007 Share Posted February 17, 2007 Adding to what Mike has said...if you find that it is the addition of the sub to the rest of the gear, you might try 'directional cables' - No! These are not he silly cables where the electrons are supposed to flow better in one direction than the other, but rather they are the audio interconnects where the shield is 'lifted' (disconnected) only on the end away from the pre-amp (and mark the connected end with tape, etc. for future reference!). This will preserve the 'shielding from RF/EMI while eliminating a ground path between the differing potentials between the two grounds of the two pieces of equipment - thus eliminating a ground loop path while preserving the AC chassis ground for safety's sake that a cheater plug eliminates. Bees would be my second guess... Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 17, 2007 Share Posted February 17, 2007 Is the system connected to a CATV or SATV source? Try disconnecting that and see if the hum disappears. There is a ground loop somewhere and this might be the culprit. Quote Link to comment Share on other sites More sharing options...
mas Posted February 17, 2007 Share Posted February 17, 2007 Mike, a good suggestion as well. If that is the source an inline isolation transformer for insertion in the RG6 input available for ~$9-10 retail should address the issue. Quote Link to comment Share on other sites More sharing options...
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