You have to tell me what the model number is or have a good picture, otherwise I would just be guessing.
I don't use speakers in the back deck, I only have front speakers, I do this because music is always played in front of you. But it can be done either way, and usually is louder with speakers in the back deck.
"Too powerful and get 6x9's," not people I would trust with car audio.
http://www.sonicelectronix.com/item_11366_Kicker-08ZX200.4.html
That's my amp
4 ohms: 35 watts x 4 chan.
2 ohms: 50 watts x 4 chan.
Bridged, 4 ohms: 100 watts x 2 chan.
Max power output: 200 watts x 4 chan.
lol same people that installed my radio said it's too powerful.