A:AnswerThe Pioneer GM-DX874 is a 4 channel full range car audio amplifier. It can operate subwoofers and full range or tweeters at the same time. It should work great. I recommend to contact the manufacturer of your speaker for more information about it's use.
A:AnswerUnless you know exactly which wires are for the speakers (vs power/ ground) I'd just run new wires. A simple way to do that is something called a 9 wire.