the the first 2 or last 2 terminals, or you can wire 2 subs a peace to 2 ohm load then use one set for each set of the subs. those terminals are wired in Parnell if i remember correctly. but you don't bridge the amp, really you can just ignore the 2 on the right unless you are going to strap 2 amps together. so [+][-][empty][empty].