amp wire sub

Hey Guys, Was wondering whether it was possible to have my factory head unit which the the amp and the sub ive listed below?? http://www.soundmaster.com.au/Pioneer-309D4SB-12inch-Subwoofer-Enclosure/309D4SB.asp...

Hey guys, I am wiring up a speaker and sub installation in a friends 1985 635csi. I installed a 1400 watt sub amp and a 900 watt speaker amp. The sub amp is on a 4 gauge wire, the speaker amp a 8 gauge wire. The wires are all installed, but the speaker amp turns on while the sub amp turns on to...