@mglik --
"... I guess the Khorns now have a different and better tweeter."
The newest AK6 version I heard a few months back sported a somewhat problematic upper end, as I wrote earlier. A quality tube amp pairing might be preferable, as some here have suggested, but still I wouldn’t expect it to completely ameliorate named shortcomings.
Can’t speak for Ralph and the Classic Audio Loudspeakers, but I would expect them to better the Khorns from the central midrange on up. They extend deeper as well, but are direct radiating here nonetheless. Not to say they don’t deliver excellent bass, I’m sure they do, but horn-loaded bass (and up to lower mids) just sounds different.