There is this device called a,
"SUB-WOOFER"
It is an amazing addition, and improves the sound in more
ways than you would expect.
Properly implemented, not ONLY is the "3d effect" THERE!
do what they where made to do.
The Bass, is NO LONGER an issue.
The sheer speed, and visceral effects of the Velodynes,
in addition to the smoothness in the highs and midrange>
If you look at my system, you will see that I have a Velodyne DD12 so I fully understand what a sub can do. The speakers I have are run full range with the sub crossed in to blend. They produce 3D imaging with or without the sub. Your comment makes absolutley no sense and is about as condescending as it gets. You state that noone is giving examples of why they don't use horns, then when someone does you imply that they have no idea what they are doing. The CS2's are designed to be flat to 20 hz and are meant to be used without a sub. That is from the designer. I suppose that you know better than him how his speakers should be set up. As far as a speaker that costs 36k requiring a sub to sound right, that is ridiculous as it gets. It better be able to do everything right for that kind of money. And while I said that the mids and highs were very nice, I did not say that they were great or revlatory. That is what I would expect at that price.
It seems that no matter the design, there is at least one person who feels that everyone else can't hear if they don't use the design they favor. It could be stats, planars, single driver, time and phase coherent with 1st order crossover, etc., or in this case, horns. Different people hear things differently. There is no such thing as a perfect speaker. Each person chooses what it is they are willing to live with that is not perfect. I have chosen to not use horns, but continue to be open to being convinced they are right for me. So far, that hasn't happened. One thing for sure, telling me I can't hear is not going to convince me of the superiority of horns.
As Learsfool states, I found the sweetspot to be very wide with the CS2's. This was also my experience with the other directivity controlled speakers that I have owned, the Legacy Audio Whisper. The Whisper was the reason I was so interested in the open baffle bass of the CS2's. In addition, both speakers were easy to place as Learsfool also mentions due to their controlled directivity and open panel bass. I have heard "head in a vice" speakers before and would never by one of them either. As I mentioned above, all of these are strictly my opinions and experiences. It is up to each person to choose what pleases them.