i have a 04 ctt with the bose system. and i just realized that i have a rockford 800a2 amp with a 12" rockford xlc sub laying around. so is there any worry of hooking up the amp to the aux battery? i will be using 4 gauge power and ground wire but using the existing signal wire, remote power, etc. and i will only be using one speaker, so 200w max. and im curious if the signal wire outputs down to say 20 hz or is it 200 hz and above or what? thanks in advance, ryan.