I run 4ga Tsunami to my DC 1.2K and it works fine. No need for 0/1 on a 1200w amplifier heh. Just get a good 4ga and you'll be fine then again I'm the forum noob... I figure if an amplifier is built to accept a curtain gauge then use that gauge. Also you can get KCA 4ga on Amazon right now for cheap, just sayin.