Another forum member
used panels similar to these in his home theater. You can see his build here: Steve's First Dedicated Theater
. Maybe he'll chime in here on how effective they are.
I do recall seeing
say that for diffusion panels to be effective, they need to be at least 4" deep, and these are only about 1". Maybe the good doctor can chime in here, also.
The price point on these and the ones that Steve used in his build thread were too attractive to pass up, so I did purchase a few boxes of them when they went on sale at Amazon. While I haven't had time to properly install them, I did sit them upright on the floor around the sides of my theater, and took before and after snapshots of the T-20 values of the room.
Here are the results:
There are definite changes in the room, but it's hard to say if there's an improvement, although a couple of sections are more consistent.
There are many caveats to offer here: My room is relatively untreated, is great need of absorption, and the panels should have been placed at ear level, not standing on the floor. (These are all on a massive to-do list.)
I do wonder if mounting them two across, but at a convex angle so that their meeting point is at least four inches out from the wall, might yield better results, and I do plan on testing this. (Again, part of a massive to-do list.)