I recently purchased a GK 1001RB-II. I knew of this problem when I bought it (used). Whenever I shut off amp, there is an audible "POP". The only way to stop this is to reduce my master/woofer volume to zero. If the volume is up, this POP is VERY loud. I'm worried about my speakers...that someday, by accident or power failure, this amp will power down without my turning that woofer volume down. This can't be normal. Anybody experience the same problem? Can it be fixed without mortgaging my house? Thanks!