The best way to apply diffusers is to first decide what kind of response you want. Once you know, the decision on what type of diffuser to add and where is not too difficult. The hard part is deciding on a design concept (assuming control room or other type of listening room and not a recording room).
Thanks Jens. Can you recommend any good books on diffusion techniques?
It's for a control room (L=5.5m W=4m H=2.8m). I'll be using the RFZ methods, with absorption at the front of the room and diffusion plus bass trapping at the back. I want a nice balance without it being too dead sounding.
I always see 1 type of diffuser on the back wall in studio pictures, and then perhaps different types on the ceiling and side walls, e.g.
Is this the best way to apply diffusion?
I was also going to have 3 or 4 skylines on the ceiling at the back of the room, and another 4 2D squared ones on the back side walls (2 each side), keeping everything in symmetry.
Best way is to deal with back wall produced LF interference firstly.
Type of diffuser applied to back wall is mainly matter of taste and someone's budget and building skills/possibilities.
There are some rules which need to be satisfied, like minimum distance from diffuser (define lowest working frequency), and avoiding many same smaller diffusers near to each other (which produce aliasing)