Are there any 6.5" coaxial speakers that have the same or almost the same SQ as 6.5" component speakers? This would be for the front door panels. If so, what's the brand/model & price?
For 6" x 9" speakers, would 2-way or 3-way be better for SQ? And this would be in the rear deck. Also what brand/model & price?
look at CDT or Infinity Kappa and Kappa Perfect speakers for both front and back. they have models that are virtually identical between separates and coaxials, not factoring for the ability to alter imaging by moving a separate tweeter of course.. but the sound quality should otherwise be just about the same with either set. as for rear speakers go with a 2 way. you don't want the rear fill to be too bright, or it will wreck your soundstage. you ideally want the music to sound like its coming from in front of you so you want the front speakers to be stronger.