what to look for in a second sub?

[huckleberryfinn]

hey, i have a kicker zx750.1 class d amp running two 12" subs and i was looking to add a multi-channel amp and was wondering what i should be looking for in the amp and also how to go about wiring it best. i have a 4 gauge running to my mono amp now.. it's kinda a general, simple question but I'm not a car stereo genius yet i just love music and love it loud. thanks!

P.S. i titled the forum wrong, oops, should be second AMP not SUB, sorry about that..

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