I have lovingly put together our home theater system a few years ago. To make a long story short, my husband attached a troubled subwoofer to my beloved receiver. A loud pop is the last sound I have heard come from the subwoofer channel (the subwoofer was working fine previously). I am fairly positive, the channel was "blown". The receiver is an Onkyo TX-DS575X, definitely not state of the art at this time. We hooked up the subwoofer to speaker B, but when speaker B is turned on surround sound mode cannot be used. What to do? Is there any way to salvage the situation or should I start reading posts in preparation of the purchase of a new receiver (not a bad thing in my book - although the husband does not I understand my need for electronics). Sorry for the rambling - I am new, go easy on me. THANK YOU.