hi i am running two apline mrv-1507 amps and two 12in mtx thunder 9500 subs. since im going to be running a large amout of power from my amps to my subs, what gauge do i need? I have about 40 ft of 8 gauge power wire laying in my garage. can i use power wire as speaker wire? or should i go out and buy 10 gauge speaker wire. I cant even find anywhere to buy 8 gauge speaker wire. what should i do?