My listening room is located on the lower floor of our home so the floor is concrete slab on grade covered by rubber underlay and wool carpet. The walls are Sheetrock on insulation filled wood studs. Nothing fancy.
I have a couple of photos that I would like to post but I still can't see how to do that. Can anyone tell me how to attach a photo from my iPhoto library to the Reply box? It's a mystery to me!

Instructions here....

https://www.audioaficionado.org/faq....b3_attachments

If the option is not available it could be that you need to accumulate x number of posts.

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Thanks for the responses regarding posting photos. It doesn't appear that I will be able to do so at this time as I don't seem to have the right permissions.
So here is my shot at describing the room treatments. The process started by me sending Chris Huston photos of the room as well as many detailed measurements. He developed a plan that he felt would address any sonic issues as well as blend with the existing architectural features of the room. After my approval, he sent me working drawings for all the treatments he recommended as well as detailed elevations showing exactly where they should be installed.
I have access to a small millwork shop and I am a reasonably skilled amateur carpenter so I was able to construct almost all of the treatments and install them myself.
There are two main areas Chris focussed on - the sidewalks and the ceiling. The room doubles as a home theatre so a large flat panel TV occupies a fair bit of the front wall making placing treatments there difficult. The rear wall has a floor to ceiling built in cabinet with many open shelves for media storage as well as being the location of the entry door to the room.
The main feature of the sidewalls are large panels which I will call slat diffusers (this may not be the correct technical name). Each one measures 6' 3" long by 6' 4" high and consists of a repeating pattern of vertical "slats" all 1 1/2" wide but varying in depth from 1 1/2" to 5 1/2". They are spaced 1" apart. There is an absorbing section on top of the slat panel that extends to the ceiling.
There are also 3 24"x48" absorbing panels (Corning 703/705) on each side wall; one toward the front of the room and two toward the back of the room.
The ceiling treatment is twofold. There are 8 24"x24" Auralex Wavelens diffusion panels located in about the middle of the ceiling as measured front to back. They are installed in a staggered pattern. The rear portion of the ceiling contains 5 24" x 24" absorbing panels made using Corning 705 and again in a staggered pattern.
All this is a bit difficult to describe but I hope this gives you the idea. As I mentioned in an earlier post, the outcome, to my ears, has been excellent.

From what you describe, the treatments seem to be sensible and without excessive absorption. If you stand in the middle of the room and click your fingers you shouldn't hear any room chatters but you should hear a small amount of decay.

Fwiw, I plugged the room dimensions into REW room sim and the result wasn't too bad. You will probably hear the primary 34Hz room mode on program with low bass, but there's also a slight suckout in the upper bass which which might make some recordings sound a bit lean. (I'm assuming that you're listening distance is roughly 10 feet) Your room treatments mostly work at mid and high frequencies to the benefit of soundstage and overall tonal accuracy. Reducing the 34Hz mode would be difficult to do with bass traps because it's such a low frequency, but if you're not hearing it on most program it's not a problem. Actually, some room gain in that region is preferred by most listeners anyway.

If you email me the pictures I can post them.

For $25/year you can become a member and pictures right away.

Well since he is doing us a favor by showing us his pics I offered to do him a favor and post the pictures. No need to pressure anyone.

I didn’t intend to pressure, only trying to inform.

Ok, new member of the 800D3 Owner’s club, replacing my 802D3. I had demoed the 800D3 in my old listening room but the room was too small to handle the bass. With my new, larger listening room, I was very impressed by the added midrange purity due to lower distortion and the bass extension. Very happy.