you do mean to hook subs the amp...not amp to battery...right?
if so then yes, 12 ga. is more than you will ever need for 600watts...i use a 600 watt amp and i use it 14 ga and it works great...and i'm pretty sure that you really dont ever need anything bigger than 14 ga...
Unless you are using some kind unreal amount of power!!!
hey yeah sorry about not mentioning the amp to sub thing. ok 12 will be enough thanks for your info. thats good cuz i just ordered some stinger 12 gauge wire! peace!