Is Room treatment different for Horn Speakers?

i would play around with placement / listening for the next few days till you think you have found the sweet spot for them.       

then you could decide if more treatments are needed in the room by simply using blankets or anything else that you can add to the room.

So far the Cornwalls sound pretty good close to the wall.

That's why they are called Cornwalls. In a Corner or near a Wall.

Dang, More robot tests...

I have a lot more listening to do before I go crazy. I think this is the 10th day of ownership.

I am remounting all the absorption panels with cleats and installing a continuous cleat across the back wall, so I can change them easily.

russ69- and that's why I bought them!😊.. I wanted something that didn't have to be set so forward into the room.

Good question ... like every room the acoustic is a factor.

Again Low Freq will muddy everything but I think you are on track with diffusion / first reflection points and maybe a mix of diffusion / absorption on the back wall.

I think you have a relatively wide dispersion with the Horns.