For #infiltration, we found 47 of these acrylic discs, only needing to be laser cut to serve as speaker walls. This was just such an amazing "lucky find" in the light lab of TU Graz, we only need to get one extra plate.
If you are not familiar with acoustics, one has to place speakers either inside an enclosure (the conventional "box"), or you create a large surface, the travelling distance from the back centre around the boundary back to the front determining the lowest producible frequency.
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