I finally completed installing the 3.5" Infinity Kappa to the dash areas of my CX-9. I took a risk ordering these 3.5" Kappas knowing they might not fit due to the limited depth but after trying to position the speakers, I was able to install them without much problem and without any modification: they are just dropped into the stock openings and screwed down. I put velcro tape on the crossover dongle and found a place to attach it so it does not dangle. With this task done, I now have two 6x8 Kappas in the front doors, two 6x8 Kappas in the rear doors and 2 3.5" Kappas in the front dash installed. I was concerned my standard stereo would not be able to drive 6 speakers but to my surprise, it handles all of them fine and the sound, at least to me, is a huge improvement over the original speakers and tweeters. The bass was more powerful, the mid range and high end frequency from 3.5" speakers were very clear. I adjusted the fading a bit more toward the front channels +2, reduced the treble to minus 2 and reduced the bass to minus 2 so the sound is more balanced overall. My next attempt will be to disconnect the tweeters to the front doors since the dash area already has two tweeters firing, and I think that is enough. I may also add an inductor in series to the front door speakers to further reduce the mid range frequency since the dash already provides the mid range, but that is something to be done in the near future. For now, I am very happy with these Infinity Kappas.