The "trees" in back of the D-Sigs are five feet tall and made of square printed PLA units of 16 cavities, each square cavity of "random" depth up to 6" deep, then assembled with superglue. The white plastic is just translucent enough that each cavity transmits a unique amount of light from the window behind it, and the resulting colors range from ivory to taupe in the daytime, and white at night. They are rather digital-organic looking, sort of like SuperMario trees.
3D printing being a remarkably slow process, this process took about three months, with the printer running 3/4 of the time. It also took about 18kg of plastic at US$50/kg.
The audible results are well worth it, IMHO. The diffusers have essentially removed the wall in back of the speakers, and give a much greater sense of depth, along with less blocking of background instruments. There is greater separation of instruments, and it is easier to follow a musical line or voice. Not having a coherent echo delayed ~7ms after the sound from the front side of the ribbons has also made the highs noticeably clearer - cymbals and horns are much less fuzzy.
So - a fun experiment that looks nice in the living room. The takeaway is that diffusers behind Apogees can add considerable definition and clarity without any artificial spaciousness. If anyone wants the .stl file to print their own, I can supply.
and it's uniqe to
