I did something very similar once. I turned my system off when I moved my speakers but I didnt recheck the tightness of the connection after I moved them. I had only moved them a foot but thanks to the weight of the ridiclous mit network boxes it slipped off and touched the other connection. With a loud electrical crack and a cloud of smoke I burnt out a 135 lb amplifier.
The company didnt charge me a penny to fix it but it sure sucked packing that thing up and shipping it.
The company didnt charge me a penny to fix it but it sure sucked packing that thing up and shipping it.