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Update: check this site for some additional info: Rotary subwoofer, 16.5“ (420mm), created primarily with my 3D-printer. Recorded at 480 fps. It will start 'woofing' at around sec. 15 at about 22Hz. You can see the door to the garage (in which it was fitted and which was fixated) moving as a result. As it turned out my garage (~100 cubic meters) is too small to function as a sounding box. Gonna try the great outdoors next to go well below 20 Hz. Am now looking
