I've had at home the famous AR 10Pi, AR9 (Teledyne from early 80's), various Cabasse models, various B&W models including 801's, Mission, KEF...
I've listened to lots of high-end speakers from JBL, B&W, 3A, Cabasse, Elipson...
My jaw dropped when I listened to these KH310. I have NEVER heard such coloration-free mids in any speaker at this price point. Total transparency. It's uncanny. As is the bass extension and punch in such a small package, without resorting to bass-reflex tuning. Thus, zero coloration in the mids from the port (something that often bothers me with ported speakers, even pricey ones).
These KH310 put to shame any offering from Focal, JBL etc. which all sound heavily colored ("monkey coffin" sound) compared to these.
The only speakers I heard that can beat the KH310 for neutrality and bandwidth in a small package, are Genelec monitors about twice the price. Granted, I still have to listen to the KH420... ;-)
After 40 years, I'm finally going to let go of my pair of (80's / Teledyne) AR9, and replace it with a pair of KH310 and a KH750 sub (not that the KH310 lack deep bass, but they do distort in the deep bass when pushing them hard).
I just wish they came in different colors, lol.