5-Channel Amp

Alright, did quite a bit of research tonight and have some questions for my whole audio idea... My problem is with wiring, first off, the power from my stock head unit is not doing enough for the currently installed speakers, so I want to disconnect the power from the head unit, and put all the power to a 5-channel amp.


I plan on the amp to power 2 Kicker DCVR122that I will get, and the 4 door speakers. Is this possible, or can I only use one 12" sub if I wanted to do that. The amp I have in mind is Boss CE2505.

So you don't have to look up the specs,

AMP:
RMS Power Rating:
4 ohms: 150 watts x 4 chan. + 500 watts x 1 chan.
Max Power Rating:
2 ohms: 250 watts x 4 chan. + 1500 watts x 1 chan.
Bridged @ 4 ohms: 500 watts x 2 chan. + 1500 watts x 1 chan.

DUAL 12" SUBS:
Peak: 1600 watts
RMS: 800 watts
2ohms


I figure it's possible to disconnect all the power from the head unit, but keep the audio.Then, even if I did all that, will I still beable to connect tweeters to the head unit, or would that not work without power going to the 4 door speakers? Lastly, I need information on tweeters, with mounting options and designs...

 

Alright, but what about the two subs working on the first channel for that amp... I see that the channel 1 at 2 ohms is 1500 peak, which is 100 below the bass... so it will hold the subwoofers, but I don't know the ohms or wattage of the stock speakers... how would I figure this info out? I'm using google, but getting dead ends.