Room Treatment? How important is it to treat the wall behind/between the speakers?

“How important is it to treat the wall behind/between the speakers”

@macg19 

Back wall, along with front wall and side reflections are equally important for an acoustically well treated room. 

Ultimately, the character of your room—how live or dead it is—will be the deciding factor in whether absorption or diffusion works best.

Absorption panels behind and between the speakers can tighten up imaging and help tame those early reflections that smear detail. Diffusion panels, on the other hand preserve a sense of openness and depth, preventing the room from becoming over-damped.

A mix of the two strikes the right balance, but the room itself will be your ultimate guide, thus requires some experimentation on your part. 

In my own room I’ve found a combination works best (see my virtual system) …diffusion on the front wall to keep depth and openness, and absorption on the back wall and side walls to tighten imaging and control reflections. That balance really helped me achieve a more natural and engaging presentation.

@OP - as with the post above, quadratic type diffusers on the wall between the speakers will open up the soundstage. Bass trapping in the corners behind the speakers can be beneficial too - not just in the bass but also in removing frequency masking that obscures midrange detail. 

2 or 3 of these on the front wall would help, but again it depends on if the room is too reflective. Usually this works best. https://www.gikacoustics.com/product/q7d-diffuser/?tw_source=google&tw_adid=649245158855&tw_campaign=19732823023&tw_kwdid=aud-1960089553334:pla-293946777986&gad_source=1&gad_campaignid=19732823023&gbraid=0AAAAAD-4A3F6gAISH72YM8xitFwA92Cxa&gclid=CjwKCAjwlOrFBhBaEiwAw4bYDZk2xlwzmWaT1Na8GDPm5bucLMq9R8Y4X4U1S3FVhkGfH8u-somATRoCPzgQAvD_BwE

The recommendations from both GIK and ATS were consistent when I requested assistance.  Diffusive panels directly behind the speakers.  Bass absorbers in the corners.  Both companies reviewed my room and setup.   Both indicated I did not need diffusive panels because my wall unit was sufficiently textured.  I recommend you contact both and send pictures of your room and set up and follow their recommendations.  

@macg19,

Your equipment is very nice and room seems to have good capability. First thing I would do is to move your speaker at least 3 more feet into the room (if possible). Adjust the seat position to close to an equilateral triangle, keeping all vertices between the speakers and speakers and you the same. That will also improve direct sound from them vs room reflections. I use lots of diffusion in my room (all walls and ceiling). You can check the pictures of my room in my profile. They are not updated after my latest diffusers and bass traps inside the closet were added, but you'll have an idea. Best of luck,