Ordered to place on my back wall, treating a first reflection point and bringing some life back into an otherwise quite heavily damped room.
Solid build, better finish than I expected... though a slight bit of damage on the edge of one of the fins/wells but it's small enough to not affect performance.
Mid - Treble has opened up and the left to right imaging is far wider now. The front edge of sounds in the panorama is more defined; smooth but tauter. The sound feels less in my face and stretches much further back.
Overall, for the price, a very solid little QRD. Plus its wood! (don't trust or like that EPS stuff) Odd design though, as far as I can tell its an 11 and a 13 glued together. Checked it out and the numbers work out and, more importantly, it sounds fantastic so whatever it's doing it works. I placed it in mirror image, with what I believe to be the 13s on the inside.
Oh, its quite heavy but not ridiculous. The mounting method is a piece of cake though, if you've got brick walls at least (can't comment on plaster/dry)
I use two t.akustik SC Diffusors in my small mixing room. They are exactly the right size to fit on my walls, and they are not too heavy, so there is no need to reinforce the wall mountings. They are quite efficient and really make the room sound as it were larger. Not the sturdiest construction though (I had to reglue one that came lose with hard handling), but once they are on the wall, it is not that important. I might get two more.
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