Originally posted by rash_girl
all right

so the amp i have now is a 2 channel, which is powering only the subs...

now if we go with mazdaspeedwest's suggestion of the 5 channel amp, can i power both subs, rear and front door speakers with that?

Yes, by adding the 5 channel amp, all speakers will have their own channels, and therefore their own gain control and crossover point. The subs can be connected in parallel (pos>pos/neg>neg) to connect to the 5 channel amps mono (single) sub output. This too will have it's own gain and crossover controls.

or can i buy another small 2-channel amp and parallel the front and rear speakers AND keep the subs with the amp they're on now?

yes you can, but like i said, you lose TOTAL control, which is not necessarily a bad thing. Make sure the amp is 2ohm stable and has good cooling, don't bury it in a tight spot. I would suggest no less than 50watts per channel of amp power, no matter what you decide.

if the tweeters aren't pulling all that much current, would i keep the deck powering them? or use an amp?

The tweeters should have atleast a capacitor inline (easiest passive crossover there is) or it could have a 2 way crossover box. This divides the frequencies, so each speaker gets the proper signals. With just a cap, the tweeter is blocked from low frequencies, but the woofer is running "full range" and the impedance is not that changed, but a good 2way crossover box will regulate a 4ohm load...to a certain extent. This way, the tweeter AND woofer are crossed over and now the woofer is no longer running full range, but rather the set frequency cut off from the crossover box.

the deck should be fine, even with all 4 channels driving 4 ohms, it was the 2ohms that was your problem. You can use the deck to power just the tweeters, or the rear doors or deck speakers and have the amps power the others...there are many possibilites. I mentioned the 5channel amp route, as i feel it's the most cost effective and has more flexibility as well as good future options if ever moved to another car. I always suggest using the more powerfull amp channels for the front speakers and if you must power a set with the deck, power a rear set.

questions questions questions...will they never cease

ummmm, doubt it hope that was pretty clear and easy to understand....