Originally Posted by
Smoove1
depends on the subs and the power your pulling off of the battery or try a cap and see if that helps if not then the alternator is what you really need to upgrade if your lights are dimming really bad afterwords.
MECP Certified Professional Installer
it would be 550 watts for the subs , around 350-400 watts for the speakers. The lights dimmed pretty bad in my crown vic with only 350 to the subs.