Just made a discovery today I need help with. The subs are hooked up within a bandpass box. I have the positive and negative lead from one side then connects to the other side followed by a single wire for both sides that lead to the speaker box terminals. I have used 5 different amps with these subs and all of them would go into protect mode after turning the volume up. The amps used do not do this when connected to other speakers. Help?