atleast you found something! they make specific batteries for car audio but a bit pricey. I hooked up a capacitor for constant volts back in the day and never had issues and fairly cheap.

Any battery > capacitor . big 3 upgrade should help enough if youre having electric issues. Never drop below 12.2 volts.

Ideal is 14.4

This post was edited by DoorRider on Apr 2 2016 01:36am

Just put new amp in why does it feel like the 500w rms amp makes these hit harder than the 800w rms amp

what exact amps are they?
what wires did u use?

brands??? some have fake amps man trying using name brand equipment

Old amp was jl audio jx500/1

This is new amp, it is hifonics
http://www.sonicelectronix.com/item_67933_Hifonics-Brutus-BRX1100.1D.html

brutus is the best line from hifonics. other wise dont touch any other line from them. the brutus will do rated or close to it. good choice in cheap rated power for the $