While adding longer speaker wire to my LF speaker ( I had the receiver on) the wires made a small arc.I didn't think much of it as its happened on many occasions throughout the years. Well this time it fried something in the receiver. The only sound that comes to the speaker is a buzz and it makes the woofer fully excurt out. I obviously disconnected it immediately. All the other speakers work fine still. Nothing appears burnt inside the receiver. What do you guys think happened? Where should I begin testing? I have a multi-meter