took some updated RTA measurements.
i've disconnected the kick panel speakers. both the 6.5" and 4" are off.
i have some Vifa and Peerless 2" full range speakers laying around. I previously tried the Vifa in the factory dash corners and the Peerless in the apillars (that previously held my Oz tweeters). they were wired in parallel.
I ran all four 2" mids up front with no tweeters. the 6.5's in the doors handled midbass. there was overlap between midbass and mids.
while this looks fine and dandy, it didn't sound that great. the highs were not detailed, just a lot of reflected noise.
so i put my Vifa tweeter spheres back in, wired a 4.5uF cap in series with the tweeters and wired that in parallel with the 2" Vifa mid.
I got this:
which is much nicer. lots of detail.
both configurations had a nice sound stage - very well centered, good depth, height, and width. but the second config was just better in every way.