Need more power, new battery + alt or Cap

OK so I just bought a new alpine deck for a '97 4-door civic dx.  The deck is rated at 60x4 RMS.  When I turn it up and bass hits the lights on the deck dim.  I'm not sure if the headlight dim, I mainly notice the deck dimming.  I'm planning on getting a 100x4 RMS amp soon and then an amp to push about 400 watts to three 12's RMS.  I was planning on just using capacitators, I can get them cheap from my work, but will capacitators alone be enough if my deck lights are already dimming?  I'm wondering if this is a sign that I need to replace my battery.  Will I be able to power this system with my current batteries and adequate capacitators?

You might want to consider an alternator upgrade along with a new dry cell competition battery to keep up with the changes in your stereo system. Caps wil help, but in the end your still better off with a high output alternator.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

In my personal opinion a capacitor would work fine but while idling the lights will still dim