There are so many options. A 1 channel amp is primarily a sub amp, and can power 2 subs when run in series. I'd recomend a 4 channel amp, along with a single channel sub amp. Use the 4 channel amp to power the interior speakers (a component set would be the best choice, as it uses seperate speakers for highs and mids-2 and 3 way speakers are cheaper ways of doing the same thing, but they are a compromise IMO). The headunit is up to you, but if you intend to use an external 4 channel amp, you have to get a HU with audio out for both the front and rear speakers, as well as subs. That limits you to a midrange-high end unit. As for capacitors, they are not really needed. They are mainly used on vehicles where major draw occurs to prevent the lights from dimming when the bass hits. You have 2 batteries, I wouldn't bother, but you can get a farad cap (capacitor) cheap if you do as part of the amp wiring kit (walmart sells them)
If you get a component system, and a set of subs, along with a good head unit, you will not believe the quality of your audio.
In case you don't know, the number of channels an amp has refer to the amount of speaker outputs they have. Subs, not requiring a left or right, can be run off a 1 channel amp if wired in series.
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Last edited by dazdillenger; 06-17-2011 at 06:43 AM.