Advice regarding acoustic treatments
I've recently completed my home theater and have been enjoying it a bunch so far. The last thing I'd like to do is get some proper acoustic treatments on the wall to help with the sound quality. I don't have any frame of reference (it sounds pretty good already), but I suspect if I heard them side by side the difference will be quite noticeable.
Room dimensions: 12.5' x 13.5' (3 walls) + 11' open back (see plan)
Speakers: 5.2.2. With 2 x 12" subs
I have two local suppliers selling treatments, one retail outlet re-selling commercial treatments and one local manufacturer who does it part time. A big difference here is cost, a setup with retail supplier is going to probably run me about $1500 CAD, the local manufacturer will likely be a third of that. The manufacturing quality of the absorber panels seem similar, one uses acoustic fiberglass, the other I'm not 100% sure what's inside but its firm.
I'm definitely interested in the local manufacturer as their pricing is very competitive, but they only make absorbers, whereas the other supplier would be a mix of absorbers and diffusers for that price. The diffusers supplied look very similar to this: archiproducts.com/en/products/vicoustic-by-exhibo/eps-decorative-acoustical-panel-wavewood-diffuser_150286. I'm not sure how effective these are vs. the multi-tiered diffusers?
So here are my questions:
1. Does a flat diffuser like that (with foam in holes) make a huge difference compared to absorbers?
2. Is there a big difference (see my room for reference) between absorbers only vs. absorbers and diffusers
3. My distance to surrounds isn't very big (4 feet or so at closest point), do diffusers add more in this situation?
4. I have furniture (a fabric couch, covered coffee table, and book shelf at the rear), this will obviously change the properties. I'd imagine the bookshelf adds diffusion, but is it at the right point? Should diffusion be close to the surrounds?
The local manufacturer recommended the following (subject to changes, coming in around $400-500 CAD total):
24"x48"x2" x 2
36"x60"x2" x 1
12"x48"x2" x 2 OR 12"x60"x2"
- 2 acoustic panels (24x48x2") on each side wall to catch the reflection points from your front speakers.
- Cloud on the ceiling, about 36"x60" just in front of the projector to absorb unwanted reflections from ceiling to floor
- 12"x24" panel on either side of the bookcase, or one longer (12"x60"x2") one across the top would dampen any reflections coming from back there.
The retail supplier would be a combination of 2x2 acoustic and diffuser panels, i think 20 total. I believe their pricing is something like:
12 x absorbers ~ 800
8 x diffusers ~ 500
Does anyone have some advice here, I realize it's hard to judge the acoustics from a post, but am I going to lose much without having diffusers? I don't think the absorber suggestions the manufacturer suggest will deaden too much, but this is my first build.
Finally, I have an Anthem MRX 720. It seems to have pretty decent room correction (made a pretty big difference with the current setup alone). My plan would be to run room correction again after installing the treatments.
Any advice would be hugely appreciated! Thanks.