How many sq feet of diffusion do I need?


I am planning on adding some Vicoustic diffusion panels to my listening room:
http://www.vicoustic.com/hifi-home-cinema/products/acoustic-treatment/walls-panels/panel/317

Each of these panels are 2' x 2'. The dealer is suggesting I cover a 4' x 4' area on my front wall (4 panels). If you click on my virtual system you will see my room is very small (9x10) and my speakers are only about 5.5' apart. Do I need that much diffusion coverage?
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Right on, Krell_man. I'm using the same setup as you in my small room, except side walls are vertical.
And your point is correct, he needs absorption, not diffusion. Panels can be flat foam, wedged, but not 3D. I'm using 2" offset wedged.

examples
I think you either have to trust the folks who have heard and measured your room or not.

You are buying their recommended solution, so maybe ask them for the best way to work towards the complete solution step by step and look for improvements each step along the way. Or perhaps get a really good discount on teh whole deal and be done with it. A satisfaction guarantee would be nice especially if there is significant $$$s involved.

Not to complicate things, but wood diffusers like those referenced look like pretty expensive ways to accomplish the goal. Everyday household items can often be used to absorb and diffuse sound for much less, assuming aesthetic issues can be worked out. Diffusing and absorbing are two different ways to accomplish similar goals. Maybe try to add some things into your listening room to help break up whatever nodes or resonances might be occurring.

Or there are surely other commercially available treatments of various types (bass traps, absorption panels, diffusing panels, even both combined) for absorption or dispersion that are more economically designed and equally as effective. I have purchased such things off Amazon and found they need not cost much to be both effective and attractive.

Off the cuff, that room looks pretty spartan and more lively as a result with speakers not too far away from walls and likely in need of some combo of absorption up front, maybe also bass traps after that. Adding diffusing panels made of hard wood (rather than say absorbent foam or equivalent) that is also highly reflective of sound does not make sense to me from what I can tell.

Have you tried moving the speakers further out into the room for comparison? Did the consultants suggest or consider that as an option to selling treatments? More distance to walls might have a similar effect and help open up soundstage and imaging perhaps as well. Easy and no cost to try and see.
Thanks everyone especially Lowrider57 for the kind words. I am a bit limited in what I can do in that room.

I can't treat 1st reflection points since my family needs access to the closet and window which are at these points.

I can't move the speakers away from the front wall more because the window and closet door cannot be accessed.

I don't think I need anything behind me because there is only a 1/3 height wall above which is open to our spacious family room and kitchen.

I guess my dilemma is I don't even know if I need room treatments. How would I know since I never had any treatments? All I know is everyone who has treatments says it's the single biggest improvement to their system.

It seems the two things people tend to agree on is larger rug and bass trapping to help clean up mids and highs. I guess I can start here but how would I know if I need more treatments? Maybe I should just screw it and continue to listen in ignorant bliss?
Not to flog a dead horse, but couldn't you hang one vertical panel on each side wall as seen in Krell_man's System photos. It looks like you have room for a panel to the left of the door or hang it on the door.
IMO, that would absorb some standing waves; your exposed side walls are causing major reflections which lead to increased brightness.
That's it from me, I'm not trying to sell you anything. lol.

Tommy,

RealTraps and GIK Acoustics, and probably others as well, have stands for their absorption panels. Then you can just move them when you need to.

Chuck