My only experience with horns is with Avant Garde Duos and why I choose not to buy a pair of horn speakers. The horns seems to work well in a long room with seating not too close. The subwoofer on the other hand wants to have you seating close. There is a mis match with this combo. The bass does not flow well. Playing certain CDs like Cowboy Junkies caused the subwoofer to load up in a large room. Of course there were certain CDs which sounded really good but I play all kinds of music so I have to have all of it. I have noticed some people on Audiogon have built bass horn speakers instead of using subwoofers which might solve the problem in my mind. I have not heard any yet but I will in the future. The last problem is you can not buy these speakers but must build them yourselves. I dont do that.
Why not horns?
I've owned a lot of speakers over the years but I have never experienced anything like the midrange reproduction from my horns. With a frequency response of 300 Hz. up to 14 Khz. from a single distortionless driver, it seems like a no-brainer that everyone would want this performance. Why don't you use horns?