Front or Back wall diffusers

You have a very nice system.  If you diffuse the front wall between the speakers they will image even better which is really saying something.  The idea of diffusion is to scatter the signal so the reflected sound doesn't return to the listener as a single competing signal.  You don't want a second signal competing with the direct signal from the mains.  As a rule of thumb one cannot over diffuse a room so you can be aggressive with the amount of area the diffuser covers on the front wall.  If you diffuse the front wall and use bass traps in the corners the DAWs will really sing.  Good luck and Cheers

This is my back wall, I have absorption panels just below my on wall slim subwoofer. To the right you can see the Auralex Pyramid Sustain diffusors which are back filled with polyfill so they double as bass traps. It doesn’t have to be either or. In this pic you can’t see the treatments to the left of the sub but it alternates, absorbers to the left of the sub, then diffusors, then absorbers, etc.

As others said, every room & system is different. There are no cookie cutter rules. I personally do the following:

Diffusers in the front and back wall. Depending on the distance from the back wall, the impact they have there is bigger. My diffusers are actually combination diffuser absorption and bass trap (GIK Alpha 6” and 4”)

Absorbers and diffusers (a mix of them two) in side walls and ceiling. Lots of experimentation needed. Actual work. Listening and REW measurements. There is no free lunch.

Base traps in both front and back corners.

In my opinion and experience, the coverage area is important. You cannot just slap a few panels here and there and call it a day.

‘Good luck. Lots of work but rewarding at the end

To add my 2c’s.

I have 7 Stillpoint Apertures 2’s, they claim to provide absorption, diffusion and reflection.

2 are in the front between the speakers (see my system page.)

2 each on each side wall (4 total) at first reflection point.

1 behind my listening position.

4 ASC tube traps in the corners.

And a couple of absorbent panels behind the speakers.

ozzy

The need for acoustic treatments is room dependent and I just share my experience for whatever it is worth. Three critical elements are (1) diffusers on front wall, (2) bass traps on both corners and (3) the distance between the speaker tweeter and front wall. (3 ft as a rule of thumb) As a gentleman mentioned earlier, you do not want the reflected signal be perceived as a direct signal and mess up the image of sound. If you need to place speakers closer to wall, some form of absorbers (like curtains I used) behind the speakers is also recommended. As far as the back wall is concerned, if your sitting position is cleared roughly 1/3 of the room from the back wall, the treatment behind is less critical.  Lastly, do not overdamp your room!!