Help quick! 4 Channel > 2 Channel?

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I need to get a new stereo for my jeep. I'm looking at a few that are 180 watt...4 channel x 45 watts. Eventually I want to get a seperate amp for the back speakers...if I did that, would it be possible to hook up the stereo so that it is only controlling the front speakers, or 2x90 watt?
 
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