Is a Capasitator the same thing as a power regulator when it comes to audio systems?

MY car at night time..

1999 Honda Civic


THe lights almost DImm all the way.. when the beats pound..

im only running a Phoenix Gold 500.2 and using a 1 Farrat Cap

I really need help on upgrading my power... cause its really straninng my electrical system, and the lights interior almost dim the guages lights etc...

to a full extend of not seeying anything on the road...

im powering some crazy PG Titinums so thats probly why any ideas.. please.....