Okay,

So I have decided to take the sound system out of the car and put it in the Blazer instead of buying a nice amp and subs for the Blazer alone. This is what I'll be working with:

2 12" Sony Xplod 1000 Watt 600 RMS (Specs below)
Sony XS-L120B5D (Sub System)
Details…
Ported enclosure with two 12" subwoofers
MDF construction with black carpet covering
Two 12" five-sided polypropylene woofers with rubber surrounds
4-ohm total impedance
Frequency response: 20 - 2,000 Hz
Power handling: 100 - 600 watts RMS (2,000 watts peak)
Sensitivity: 89 dB/W/m
Dimensions: 32"W x 16-1/16"H x 18"D1 x 15-1/4"D2
Mass: 54 lbs 1 oz


Sony Xplod 800 Watt Amp (specs below)
Sony XM-ZR1252 (Amp)
Details…
ZR Series Class A/B
400W x 2 Max Power Output
125W x 2 into 4 ohms, 20Hz - 20kHz, 1.0% THD
170W x 2 into 2 ohms, 20Hz - 20kHz, 1.0% THD
340W Bridged into 4 ohms, THD%
80Hz Hi/Low - Pass Filter
-12dB/oct Selectable Slope
Signal-to-noise ratio: 93dBA
Frequency Response: 5 - 50kHz
Current Drain at rated output: 32A
Dimensions: 15.5"W x 2.2"H x 10"D
Mass: 6 lbs 10 oz

I'm thinking about buying a separate amp to power the speakers. A cheap 4 channel amp.
The speakers are JVC 230 watt peak 40 rms speakers 4 of them.

What amp should I get to power these speakers that is compatible with everything above? I was looking at something cheap like this

Any suggestions?

 

That amp will work fine. Any amp/stereo combo is going to be "compatible". It's just a matter of what you're looking to achieve, your price range and can you hook it up yourself, or will you have to have someone else do it. Since you already have the 2 channel, all you're going to need is a set of 4 channel RCA cables, a 2 amp distribution block and a place to mount it. You can split the remote wire. Just hook it up to 1 amp, then run a piece of wire to the other amp. As for the ground, try to ground them to the same place, if possible.