Sooooo, my new head unit (DUAL XDVD700) comes with 2 RCA's for Front, Rear, and a single RCA for the sub. I'm running two, 2 ch amps, 300w for my mids and highs, and a 1200w for my subs.
My question is, how should I plug in the RCA's from my head unit? Should I run the Front RCAs to my 300w amp then to my front and rear speakers and the Rear RCAs to my subs and leave the single RCA that's meant for the sub unplugged? Or should I get a mono amp for my sub and a 4 channel for my mids and highs.

I don't even know if I'm explaining this right. Someone help me out here.