Query About Everything lol

[HickRm]

1) I have a a feeling I am under powering my sub using JL Audio E1200 Amp (120 rms) to power a JL Audio 12” sub 12W0-4

2) Also I'm after a cheap (but half decent) 2 or 4 channel amp to power:

Front: JL C2 650x coaxials

Back: JL Audio TR525 coaxials

I know the consensus on here is not to amp the rears, what is the thinking behind this?

3) Also to begin with if use a square of Dynamat around the speakers as a baffle will this make a difference?

4) I have the following wiring kit currently http://www.knukonceptz.com/productDetail.cfm?prodID=KLM-K4. For installing another amp I am assuming using a distribution block I would have the 4 gauge in one end and the to 8 gauge wiring leading out (to power two amps).

So to go from a one amp to a two amp install all I need is distribution block, ground wire, remote turn on lead and RCA cables and speaker wiring?

Thanks



Thanks