Klipsch LaScallas vs Klipsch Cornwalls?

Being a fan of the Heritage speakers as well, I would be concerned about your room size. You may want to consider the Fortes or even the Quartets. The Fortes go lower than either of the two speakers that you are considering and take up less floor space. They are also optimized for in-room placement. The tradeoff is that they are significantly less sensitive than the speakers that you are considering, however your Dyna could drive them to club filling levels so I don't think that is an issue, unless you want to go single ended.

Don't take this the wrong way but I wouldn't put either Klipsch in a room that small. My Cornwalls were barely small enough for a 15 x 22 room. You will have loads of detail and volume but no imaging at all. Stand mounted Heresey's should image better with a little less bass(I've had these too). KG4's may work too.

I'd suggest finding some Coincident speakers if you can't find Spendors. In a room your size, it will be like having giant headphones using a pair of Cornwalls. I love/miss my Corwalls but would never use them in a room that small.

I Agree the Heresys make more sense for that room. I own LaScalas and Heresys both the first type.
The secret to getting a satisying sound from any of them I found was to give the woofer power to spare so it will breathe and balance the overall tone. McIntosh power amps synergise well inspite of the general conviction that these highly sensitive are ideal with SETs.
I also agree to dampen the squawker horn and would take some nasty sizzle out of the tweeters via upgraded crossovers if they were not just part of a collection of speakers that aren't in my primary or second systems.

A 15 x 22 room would be fine for Lascalas or Cornwalls(from lots of experience). If an image cannot be created some placement trial and error (both speakers and listening seat), room treatment, and associated equipment would help. As far as a 14 x 13 room, this could be a bit small for either of them, but could work with the right know how. Just the speakers and 1 listening chair could be magical, as well as everything else I mentioned.

I've been researching trying Klipsch/horns for a 12X12 room with similar size constraints.

Here's where I am these days.

Heresy's would seem to be the place to start. Cornwalls would be next if bass in Heresy's turned out to be an issue (not sure it would be for me from what I have read, particularly with newer heresy IIIs, in that these would not be my main speakers and used more for background listening.

If I had the room and time and patience to deal and tinker with them, I would consider pure horns rather than hybrids like La Scala or Klipschorn.

JohnK keeps mentioning Altecs. Maybe, but I am not sure how to recognize exactly what I am getting with many older Altecs I see on the used market these days. Plus, I recall hearing Altecs on occasion years ago (albeit not on great systems) and not being impressed at the time.