personally i have alpine SD splits, MB Quart 200w ish amp, pioneer head deck with pre outs and its perfect the sound is balanced and sharp with a good kick in the back when the bass hits.
i tried a 10" sub and amp but it was way too much bass even on minim gain, my car is partially striped so that may have something to do with it but these 2 speakers are more than enough i even took the focals out of the front :>