SET Man, I think 4" is right. The cone itself is less than 3" in diameter. It actually sounds far, far better than I had ever expected (the amount of bass is especially surprising, considering the size), but they are simply too small to do certain music. I think to get the kind of sound I want I would have to go to something like a Fostex F200 or Lowethor, and at that point I'm getting into similar costs. Eventually I will definately do that (I really enjoy the fullrange sound), but right now I'm up for a change. I helped the same friend that I built those speakers with build a MLTQW set based on Fostex 6" drivers that sounds pretty nice. I could probably borrow those for an extended period of time if I decide to go back to full range again.
Bryan, thanks for the info. I didn't really think it was low end, but I just want to be sure if I'm going to put that much effort into something. I think that the 35F might be a better choice for now, because if the Peridot is more of a "last speaker ever" type quality, I'd want to do a much better job on the cabinet finishing than I am currently capable of. One question, the placement of the woofers in the 35F seems rather odd, does having them spaced so far apart hurt the imaging and whatnot any?
I'm currently in Omaha, NE. Apparently Ellis audio is based here, but a casual search didn't find much else. It'd be wonderful if I could actually audition some of this equipment.