Crown PSA-2 power amp. Right after turning power on with volume controls all the way down, the amp continuosly thumps the woofers (alternating from the right to the left. This just started to happen. No prior problems. When the thumping is happening, I can see the cones retracting hard and the thumping is extremely loud. When the right side thumps, the right side standby light blinks and then goes off. Same for the left side. The IOC lights don't come on. This amp is part of a tri-amped system. It drives a pair of Klipsch KI-115"s.
Thank you for any assistance you can provide. William.
Tags: