Absorption, Diffusion or a combination of it all?

OP

If you look at my virtual system you can see how I implemented the video. Interleaf diffusors and absorbers, pretty simple. 2D diffusors in front half of the room and 3D diffusors in back. Absorption on the back wall directly behind MLP with diffusors to each side. 

OP. Anthony Grimaldi has an "acoustic recipe" based on thousands of rooms he has tuned. You may want to tweak it a bit but it gets you extremely pleasing results as a starting point. It starts at the :49 min mark in this video:

https://www.youtube.com/live/G0ekssXX7rE?feature=share

@leggs 

After watching that video I moved the treatments I already had to the suggested locations, wow! I previously had absorption on the front wall in addition to those bass traps in the corners (pics in my  profile). I replaced the absorption panels with two combo panels and big difference. 
Then I followed the rest of the "recipe" interleafing absorbers and diffusors, etc. I bought most of my treatments through auralex and found great results at reasonbale prices, especially the diffusors. If I were starting from scratch I would just get a room kit from anthony's company, www.sonitususa.com.

Perhaps I'm a purist. I want to hear the recording the way it was produced and intended to be heard.

Compressed and with a sizzling treble for ear buds/car radio playback? I think a lot of recordings are engineered with the lowest common denominator in mind.

@wyoboy

Those diffusors are $500 for a pair. I bound them together with zip ties and then got the hanging hardware on amazon. The engineers at sonitus give free consults, just call them, np. 

https://www.sweetwater.com/store/detail/PSSC22--partscience-spacecoupler-2-pack

@wyoboy 

The setup is the same for both 2 channel and HT, Look at the room kits at is website and you can compare both setups. I have a large windo to the right side of my MLP and I hung a diffusor called an acoustic lens which allows the light to pass through. You can see a pic in my profile system. You will see that the room kits are determined by the size of your room

Here is the layout for 2 channel (they also have HT):

https://www.sonitususa.com/product/studio-acoustical-systems

@wyoboy

Yes, the acoustic lens is the squarish thing. I had the vertical blinds long before I had the acoustic lens diffusor, they don’t do anything. I got the idea to hang it from a recording studio that had the same issue and had the acoustic lens hanging and it did the trick. You'll see in the pics I also have a "cloud" of acoustic lens hanging at the rear of the room below my PJ. All I did was follow Anthony Grimani's acoustic recipe. Here is a link to the various diffusors I use in my setup:

https://www.oeler.com/pdfs/Sustain-Data-Sheet.pdf