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probably a stupid question, but is there anything wrong with only runnign two channels of a 4 channels amp?

no, its fine.

good. i may use only two channels of my kicker kx350.4 on some 2 ohm image dynamics cx62 midbass drivers, in either my doors or rear, becuz i dont want to draw too much more power from my eletrical system. and im thinkin 90w rms would do these well.