I just began experiencing this same problem. I hadn't changed anything at all, and all of a sudden pops and ticks and also random whitenoise static. This is on 3 dedicated 30 and 20 amp lines too! I've been listening for 6 months with same setup and all of a sudden it just started! I thought it was tied to my wife's running the dryer, but she shut it off and it kept occuring. Also, I have a minifridge in my listening room. The compressor was running and when it stopped all of a sudden I heard a pop out of my right speaker! It is driving me nuts as these are running on the dedicated lines and shouldn't be affected by other things running in the house.
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