I use an older Macintosh MC752 to drive the upper end (and a MC300 for the lower) of my Klipish CF 4. The adjustable gain works well to tame the horns along with the McIntosh “warm sound”. This amp combo brings out the best of these speakers!
Downside is it’s not an easy amp to find and it’s a little pricey. But I love my little rugged 752.