Thanks for suggestions @dave_b and @russ69. I live in Europe so used Klipsch heritage speakers are rare, would have loved to try a La Scala though.
I’ve now spent two evenings with the 4349 which I have on loan from my dealer. Brand new so they probably need a lot more time before they open up. Impressions so far: 4349 is a better speaker than L100, more balanced and a more refined treble. They seem a little shy in the bass initially, maybe because they are new. L100 had more mid bass immediately out of the box though, bass that was both heard and felt.
Voices are really good, better than they were when I tried L100. Overall a very good speaker.
Still considering Cornwall IVs though. While I really like 4349 they are still quite bright and I’m worrying about fatigue.
Not sure if Cornwall IVs are less bright and if I go for them I’ll need to buy unheard. Luckily I don’t need to decide yet, maybe someone has heard both JBLs and Cornwall IVs and can advice?