Id like to hook up another sub into my car (totaling 3 subs, possibly 4 in the end) and I know how to hook up single amps fine, but I've never hooked up more than 1 amp in a single car. I need this second amp because im running 2 12's from 1 amp(very close to a full load on the amp) and id like to add another sub. How should I go about doing this. Both amps are 760W. Is it the same like a single amp, just run another power wire and ground?