i'm new to car audio i'm not looking for the top of the line system, just want something sounding good in my car. i have a panasonic head unit, sony xplode front and rear speakers, 2 10" JL subs and its all powered by a lightning audio amp. i'm looking for another amp to power my subs cuz the amp i have is too weak for the subs. i'm planning to use my lightning audio amp to power my speakers and buy another amp for the subs. i'm on a tight budget and i found a rockford fosgate 100a2 amp for a good deal. i know this isn't much power but will it be decent enough to power my subs. also another option is a alpine 100m amp. it costs more but would it be much better? or should i just run my speakers off the head unit and use my existing amp for the subs. thanks in advance.