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hmmm...i doubt they would put class A amps into a $500 receiver, but you never know! Class A or not, it's hard to beat H/K amps for the price...

I really think it's the high current amps that is causing the shut-down, since it seems a UPS helps this problem go away...so H/K is partially correct in blaming the wiring in the house. At any rate, I was sad to let my 520 go, but the shutdown problem, lack of DD-EX, overly bright faceplate...

Hey Andrew... I used to have the 520 and it also did the spontaneous shut down. Onecall and H/K said it was the wiring in my house that was causing it...so you might want to check that. But I've known several people on this board with the x20 series with the spontaneous shutdown problem AND...