Moin moin, to me this scenario happened exactly 2 times. Everything is going great for half a year, and all of a sudden my power amplifier does not look like me. I switched off the fuses, had power for 10 seconds as before, and then again the fuses. Then the same again with the same power amplifier, but this time it went into smoke. Great. I had checked all cables before. 2 power amplifiers in the gray, I guess irreparable. Warranty wech. Sound wech. Only explanation would be for me that I was there. first power, then mass. Am I now n dowie? Please help me before I save my 3rd power stage. Thank you already once in advance.