i know its hooked up to the subs i think its hooked up to the door speakers too im not sure though the guy told me that when i get the chjance to get a 4 channel amp to hook up to the doors or at least the front doors.
so you only have 1 amp right now? what amp is it? I bet your head unit is running your rear and fronts and the amp is running the subs. If the guy who installed it knew what he was doing then you shouldnt blow anything.
listen for crackles, youll here it it wont just lock up, hmmm... usually, lol, circuit city, if you took their advice you will be fine, cuz if they are overpowering you on their advice they get into trouble they always try to talk you down to a lower wattage, but i would say you are gonna drain your headunit before anything else, just in my experience, later hopefully they help you out somemore, latez