I have a Yamaha DSP-A595 amp that has no output to the sub woofer channel, I put it in for repair and was told that it was the equalizer chip that had gone. £88 to repair it. Am I being diddled? or is this a genuine problem. I cannot find any information on the web so I thought that I would ask you guys. The guy in the shop seems to be having trouble getting hold of one as it has been in there for nearly three weeks and I am having to use a cheap sherwood receiver that sounds awful compared to the yamaha.