Are the woofer in separate enclosures 12's in on and 10's in another? In most setup mixing woofer sizes is just bad practice. If you have to run all 4 woofer. place the 12's in one enclosure and the 10's in anther. then place the 12's on one channel and the 10's on the other. But I would suggest just running one size.
Look at then RCA I don't have any knowledge on this brand but I would guest that one set maybe output or a through connection to jump to another amp.
Is this it?[\url]
http://www.cardiscountstereos.com/catalog%20page.asp?Product+%23=OV22600[url]