DD and SSA make products designed for SPL competitions. There's a lot of SSA guys using sundown audio amps. The owner of Sundown, along with the company are in NC somewhere. Maybe near Asheville?
If the lights are already dimming then you may need a bigger battery or a better alternator; your choice. Don't start using caps. A capacitor is designed to help with ripple/stabilization and other problems associated with long electrical runs. On motherboards for CPU overclocking, caps are a major part of voltage stabilization.
I think upgrading speakers would be a good idea instead of introducing the conundrum of adding more power from a source that's already lacking. Kicker's just don't do it. Go demo some DD
