Thanks Bill. I checked yesterday and it was definitely the source. I've never run into any true clipping situations with my amp (onkyo tx-nr808) and I have the Klipsch RF-62 II system which is very efficient. It only happens on certain broadcasts where it goes from extremely quiet to loud all at once and I'm guessing tests the mics being used. I switched it over to the television speakers and it happened there too at lower volumes. Football typically isn't an offender, usually golf.