Definitely get rid of that RCA cable. A good article on ground loops is available at: http://www.epanorama.net/documents/groundloop/index.html Also UPSs can be problematic. (Big transformers, sine wave clipping and floating grounds.) maybe look at a power conditioner instead. -- Jay Shaffer Mac Audio Guy Author of "The MacAddict Guide to Making Music with GarageBand" mag at jayshaffer.com http://macaudioguy.com/ On Mar 8, 2005, at 3:37 AM, David DelMonte wrote: > Gregg, I think it did fix the problem - but it is not fully > satisfying. Yes, everything is plugged into the same outlet - in fact > - to a UPS device (APC). But I also had to wiggle the audio cable > (RCA) in order to get the buzz to stop. > > Can you please explain a little about how a ground loop happens? > > David > > ps. I of course swapped audio cables. same experience. > > On Mar 8, 2005, at 3:51 AM, Gregg Gorrie wrote: > >> on 3/7/05 3:27 PM, Carol Stein at carol at carolstein.com wrote: >> >>> Thanks for taking the time to answer. I will check out the circuit >>> situation >>> Carol >>> >> >>>> It sounds like what you're experiencing is a ground loop. Make sure >>>> that >>>> everything in your computer system and your audio chain (interface, >>>> mixer, >>>> etc.) is using the same A.C. electrical circuit ... use one or more >>>> power >>>> bars if needed and have them all going to one plug-in at the end. >>>> >>>> Alternatively, if the M-Audio interface or any of your other audio >>>> equipment >>>> has a ground lift switch, lift the ground to see if that solves the >>>> problem. >>>> -- >>>> Gregg >> >> No problem. Please let me know if this fixes your problem (both you >> and >> David). >> >> Carol, this solution should also include all of your video equipment >> (ie >> camera, monitor, etc.) as well as the audio and computer equipment. >> >> -- >> Gregg >> >> _______________________________________________ >> MacProAudio mailing list >> MacProAudio at listserver.themacintoshguy.com >> http://listserver.themacintoshguy.com/mailman/listinfo/macproaudio >> >> Listmom is trying to clean out his closets! Vintage Mac and random >> stuff: >> http://search.ebay.com/_W0QQsassZmacguy1984 > > _______________________________________________ > MacProAudio mailing list > MacProAudio at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/macproaudio > > Listmom is trying to clean out his closets! Vintage Mac and random > stuff: > http://search.ebay.com/_W0QQsassZmacguy1984 >