Front or Back wall diffusers

@avl1947 

It's obviously room dependent. In mine diffusers/absorbers on back wall and diffusers only on rear of both sidewalls. Also diffusers at first reflection points on sidewalls and absorbers right next to them on second reflection points. Plus diffusers on ceiling between listening chair and speakers. Hardly any diffusing on front wall specially since speakers are 54" from front wall. I believe many audiophiles put diffusers on front wall because they like to look at it. To each his own. I go strictly for sound. You questioning the matter is smart. You can see most of my acoustic setup on my house of stereo system. Enjoy the journey.

Also, about 6 years ago, when drawing the original plans for the house of stereo, GIK told me that the front wall should be addressed last if at all. Just saying.

Also, about 6 years ago, when drawing the original plans for the house of stereo, GIK told me that the front wall should be addressed last if at all. Just saying.

That's interesting. After I fully treated my room I noticed that my music wasn't very lively and imaging wasn't very good. I began to remove panels from the front wall and the more space on the wall, the better it sounded. Now I have no treatments on my front wall and music sounds better than I could have hoped for. Listening to large scale classical I'm experiencing a wide 3D soundstage with concert hall ambience. 

That's a generous sized room. The main thing to remember is you are treating a system that consists of the speakers, where they are in the room, and thus how the acoustically load the room, and the room characteristics themselves, including all walls ceiling and floor. No one wall or surface is more important than any other except for two things: 1) Controlling first reflections on the side walls and ceiling. 2) Bass traps are different, as corner placement is far more effective.

Acoustics isn't opinion, it's applied math and physics,  and it's pretty well documented and computer modeled at this point. A room of your size will require somewhere between 100 and 140 ft2 of 2" acoustical panels between the 4 walls and ceiling, plus 2-4 Bass traps. Figure $12-15 per ft2, installed for 2'X4' panel or around so maybe $2500 all in, depending on your choices of fabric and local labor rates. The panels aren't hard to DIY install, but it's definitely better with 2 people and appropriate ladders. A pro will also use a laser to make sure panels are installed square and level.

Take your time, do the math and enjoy the results. You'll wonder why you waited so long.