Hey guys.  I have noticed that my speakers are popping.  This happens when it switches to a commercial sometimes.  I am using a Pioneer SC-05 receiver.  There is a ground loop in my apartment.  I noticed this by the purple lines on my projector.  I fixed that by installing a special cable spliter and then running the cable through a UPS.  The receiver plugs into the UPS as well.  I am pretty sure the UPS is cleaning the power as well or at least keeping the current at sufficient level.

What could be causing the popping?  This never happened before until I moved the UPS to another wall outlet.  Could it be a setting on the receiver?  Bad wiring?

 This has happened on my front speakers as well as the back.  I am kind of worried since I paid a good amount of money for these and want to keep them in the best condition possible.  Can any of you guys help?  What could be causing the popping?

 Thanks folks!  :o)