SMT Wing Diffusors vs. QRD Diffusors? Effective?


Well-Known Member
May 24, 2015
Anyone recommend the most desirable type of wood when looking at diffusers? Baltic birch, pine, mdf or does it really matter as long as the design is well executed? Thank you.

Available products have different properties regarding reflection, diffusion and absorption. Material absorption is one factor, but the design itself also result in more or less "geometrical" absorption, i.e. due to the shape of the diffusing elements.
If you're looking for a diffusor, I would recommend to first look at the range and efficiency of diffusion, i.e. the geometrical design. Secondly the material property which will mainly affect the degree of absorption.


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Oct 5, 2012
SMT Wing diffusors are made from MDF and can be painted to your desire. You can also choose from a few real wood veneers but the price goes up considerably and I doubt this option sounds any better then the standard. I suspect that real wood Wing diffusers (I don’t know if that option exists at SMT) would cost at least three times more. But FWIW, I would certainly choose maple, birch or some other real wood instead of MDF if money was not an object. And I would only wax if at all.

Gene 15352

Well-Known Member
Feb 19, 2013
Ontario, Canada
Thank you Cal_jr and Marcus, very informative. Looking at 3D wall art for fun as well. Aesthetically pleasing but may not be up to audiophile standards.


Jan 6, 2013
In your experience with both products, is there any logical way to use both products at the same time, trying to realize the best of both products in the same system?

Do you happen to be familiar with the pros and cons of the RPG Diffractal product versus the RPG Modfractal product?

I really don’t see there is a need to use both products together.

If you use a long array of diffractal, the pattern of the diffractal repeats itself. The diffracted sound will exhibit lobing. Modffractual will reduce the lobing by using kind of non repeating pattern.


Nov 6, 2018
if you have only 1 ,, I’d put it behind your head , about 2 feet, to diffuse ...

ideally, you really need (several) pairs , for symmetry
Hi caesar,
Thanks for your advice.
I was just wondering if to put it at the front wall's first reflection point or behind my sitting position.


Member Sponsor
Oct 5, 2012
if you have only 1 ,, I’d put it behind your head , about 2 feet, to diffuse ...
Agree. I have tried this with two and was impressed but ultimately removed them since you simply cannot have these in the middle of the living room. It was a nice experiment though. If you need an instant proof of their efficiency, just put them behind your seat.


Dec 16, 2012
MBL takes them to every show in the USA. And they are CONSISTENTLY one of the top rooms at EVERY show. What more can one say?
Add Marten, Wilson, Magico to this list! In Munich at least, where they must sound at their best...
Oh, quite a few brands, including some mentioned above, don't want you to know, so they put a nice printed fabric in front.
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Well-Known Member
May 31, 2010
Hi caesar,
Thanks for your advice.
I was just wondering if to put it at the front wall's first reflection point or behind my sitting position.
Yes, as Marcus mentioned, if you can get the panel 2-3 feet behind your seat, it's the best thing to do with a single panel. My understanding is that SMT actually recommends a small "wall" of 2 or 3 panels behind the listening positioning.

While you are playing around, try placing the panel about 2 feet behind each of the speakers, and also in the first reflection points of each speaker to get a sense of what it can do. Good luck!
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