[drummermitchell]

 If you were sitting say 5'to 5'.5" from backwall and you had a diffusors with wells 8" deep,I assume that would defeat the purpose.
I would also imagine(maybe)that even 6"depth might be too much,Thoughts anyone,thanks.

[jimbop]

This is similar to a question I've asked several times:

How does one decide the depth of a diffusor?

How do diffusors of different depths sound to the listener?

[drummermitchell]

As the Gik Q7D has 6"(the deepest well)I believe(and Bryan can correct me)I believe seating is suppose to be 6' or more.
Another primacoustics(razor) diffusors I checked out had 8' deepest and they recommended 6-8',he didn't want to sell me one as my backwall is 5'5"away and thats tight.Sides were looking at 999.00 each
The realtraps come in 3"deepest well(near) and then the 6"deepest well(far)versions,RT recommends 6'also or more for the far version.
So I guess I'm right the edge:yes,no,yes,no.five foot five in.
I don't dare move my couch up another 7",could knock down the office wall,wife would love that .
Thought it was hard purchasing a cinemascope screen,diffusion is also.
Sometimes to much reading,boggle,boggle.
i'm sure Bryan or others will diffuse the situation .

jimbop,on realtraps site,Ethan demonstrates the sound of the different depths of the wells,also cylindral type diffusors.

[jimdgoulding]

I'm hardly an expert on diffusors*, so first I may need to back check my understanding.  Feel free to correct me.  If wavelengths from our speakers output(s) reach the back wall in our listening environment with uniformity, then that's what we can expect to hear in summation where we sit.  This could have an impact on our in room frequency response and the localization of instruments in the soundfield.  The purpose of diffusion(?) is to divide up that reflection so it is staggered or spread out over time and be less harmfully cumulative to our end game.  I suspect that if cavaties are used as a means of diffusion, like I've seen in some products, they shouldn't be too deep as this will create small echo chambers. 

*I haven't had to be.  As I have lots of records, I use tall and wide backless record cabinets for this from IKEA on my back wall and sit about 6' away from it. 

[bpape]

Proper diffusion will scatter both in space and in time. So the single specular reflection would then arrive at you from multiple places and at multiple times. 

The distance is really based on the lowest frequency that a diffuser will function.  5-5.5' is right on the edge of where the Q7D will function in terms of purely direct diffusion. Now, where we're working say up high in a room and primarily trying to minimize slap and flutter echo, the distance isn't as critical.

The problem sitting too close is that there is simply not enough space for the waves to spread out in different directions and some pretty odd sounds can be heard very close to a diffuser. 

Bryan

[jimbop]

How do diffusors affect the soundstage?

[bpape]

Kind of depends where in the room you put them.

[jostber]

How do diffusors affect the soundstage?

This article from Stece Deckert gives a quite good overview:

http://www.decware.com/paper39.htm

[jimdgoulding]

How do diffusors affect the soundstage?

It's the room that does.  The benefit from treatment is to better remove the room as adversary to a recording.

[SoCalWJS]

This article from Stece Deckert gives a quite good overview:

http://www.decware.com/paper39.htm

Thanks for this link. Very straight forward. Looks like front/rear wall is their preference for Diffusion.

Not sure which diffuser to use though. (thickness and #)

[jostber]

Thanks for this link. Very straight forward. Looks like front/rear wall is their preference for Diffusion.

Not sure which diffuser to use though. (thickness and #)

The article links further to this one with more information: http://www.decware.com/paper36.htm

[bpape]

Where and when diffusion is applicable on the front wall depends a lot on the type of speakers you have.  Read that article with that in mind since Steve sells omnidirctional speakers. 

On the rear wall, diffusion can be more generally used with the caveats that the seating must be far enough away for them to function properly, and that one might not be better off with broadband bass control if you have larger bass cancellations off the wall or buildup from sitting to close to the wall.

Bryan

[bs0755]

Proper diffusion will scatter both in space and in time. So the single specular reflection would then arrive at you from multiple places and at multiple times. 

The distance is really based on the lowest frequency that a diffuser will function.  5-5.5' is right on the edge of where the Q7D will function in terms of purely direct diffusion. Now, where we're working say up high in a room and primarily trying to minimize slap and flutter echo, the distance isn't as critical.

The problem sitting too close is that there is simply not enough space for the waves to spread out in different directions and some pretty odd sounds can be heard very close to a diffuser. 

Bryan

I have 4 Tri-traps in my rear corners, and three large 4 inch absorption panels spanning the lower half of my rear wall. My couch is about a foot away from the rear wall--Could I get away with mounting some GridFusors on the rear wall, near the ceiling?
Thanks!

[bpape]

Near the ceiling - probably.  Up there, we're more trying to minimize slap and flutter echo rather than it being in a direct listening path.

Bryan

[bs0755]

Thanks-I think I am finally catching on! How close to the ceiling to the ceiling can they go? I assume that since I am so close, that I would orient them vertically, to direct the sound away from me?

[bpape]

If you orient the ribs vertically, you will scatter side to side.  They can go within a couple inches of the ceiling in this configuration.

Bryan