okay, so right now i have a 300 watt amp ran to a jl 10w1, and i know it doesnt effect the battery or alternator right now... but here soon im going to be getting 2 jl 10w6's.. im thinking i will need another battery for this setup? i would be running 2 jl 500/1 amps to each, would i need a new alternator or battery? how would i setup another battery to it? (1998 monte carlo)