I just tried this experiment yesterday, I removed my two 4x6 2 way pioneers from the dash and installed a pair of 6.5 pioneer coaxials in my doors. I removed the 4x6s because it seems like they can distort with all the open space in the dash, its not exactly set up for midrange/bass response.
The sound seems a little more on the same level, i can actually hear my rears at level with the fronts and the bass is more pronounced from my bazooka tube, i just feel so far I lost my upper sound stage with the highs. I will have to road test it some and see what the final verdict is. I think what I may just do is install my Polk MOMO set in there with the tweeters in the dash and the woofers in the door. Just need to find where all the speaker wire goes so I can connect the crossover in the middle!
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