Klipsch LaScallas vs Klipsch Cornwalls?

I had Cornwalls and Lascalas and listened to them in a moderately sized space of about 20 x15 and then in a smaller 13 x13 room when I moved my system. I actually liked them both better in the smaller room. Both pairs were stock (although the Cornwalls had the factory risers). I found that the Lascalas were more pleasing with my system - there was some trade off in that bass was more powerful with the Cornwalls but the midrange with the Lascalas was fantantic. I think either would work in your room as they did with me. I should say that I don't have either pair now. My son took the Cornwalls for his system and I sold the Lascalas. I'm now using Khorns in that smaller room. Love the sound! I did install Crites tweeters and crossovers and Trachorns for the midrange. I think the imaging would be better in a larger space but I'm still very happy with my system.

I have owned both. THE LA SCALLAS ARE M U C K better

I've owned both (as well as KHorns, Chorus, Fortes, Quartets, Heresy's, KLF-20s, CF-4s and RF-7s) and used them in even a smaller room than yours. Unless you are a head banger (I'm not) a horn speaker (even a large one) can do great things in even a small room. I like listening at low levels but still having a whole signal to listen to. Klipsch are perfect for this. The Cornwalls will give you a bit more bass, the LaScalas will sound a bit more 'open' due to the flare of the horn. I would go for the Cornwall first, but would be happy with the LaScala as well.