I tried hooking my stereo receiver (about 15 years old but working great) to one 6" sub speaker. I connected the positives of both speaker wire outs and both of the negivatives of the speakers out and connected the positives to one side of the speaker and the negitives to the other side of the speaker. It seamed to work, but as I turned up the volume I heard a pop and then my receiver died and now it won't power on.

So, what could this be. I'd like to know so I can buy a replacement part for it cause I really like it.