Amp problem. I have a yamaha home theater amp and when I hook up my frount main speakers I get a

Question

I have a yamaha home theater amp and when I hook up my frount main speakers I get a loud hilicoctor sound from my speakers. It also seems it has a lot of poower pushibg throug the speaker wire because it sparks hard when I try to kook the speakers up. Both the neg and positves are right. Do you think the amps bad?