Cabinet for 2-way ported loudspeaker
Description
This is a (not yet tested) design for a 2-way high fidelity loudspeaker. Concept: Cabinet rigidity and avoidance of bass or midrange resonances is important for a loudspeaker, But thick, heavy cabinets aren't very practical for 3D printing(!), so this design uses a "matrix" structure inside to provide high overall rigidity and to move all vibrational modes to higher frequencies. A matrix structure is similar to 'infill' on a 3D print, but more sparse since enough internal air volume is important for a loudspeaker bass cabinet. The top struts of the matrix structure (when the speaker cabinet is printed with its baffle face down) are arced to help with the needed bridging when printing. Supports should be used from the bed surface only to help with overhangs in the driver area. A section of the matrix structure has been removed at the back to provide room for a crossover network. If I ever build this, I'll put a door onto the back panel for a crossover board and speaker binding post connectors. I'll wait to see what the crossover needs to be before doing that! This design uses an **Anarchy 554** woofer (https://www.diysoundgroup.com/speaker-parts/speaker-components/woofers/anarchy55-4ohm.html) and a **Tectonic TEBM46C20N-4B** BMR-type tweeter (https://www.parts-express.com/tectonic-tebm46c20n-4b-bmr-3-full-range-speaker-4-ohm--297-2157). These are not cheap drivers, but are still on the very reasonable end of the price range for a speaker design with high-end audio aspirations. Bass is projected (using WinISD software modeling) to be -3dB at 46Hz before room-lift (so should get down to an honest ~40Hz in-room). The Anarchy woofer has a lot of output capability for such a very small woofer, so this speaker should act much larger than its size might otherwise suggest. The BMR tweeter has an unusually wide coverage angle and can be crossed over down at about 500Hz, so this speaker should have quite good off-axis behaviour and near point-source performance. But -- then again, this design hasn't yet been built so no promises about what it will actually do! Also, without having drivers in a cabinet, no crossover network has been designed. Just a work-in-progress for the time being. This one needs every millimeter of a 300mmx300mm (and 260mm high) printer capacity, so make sure your endstops are carefully aligned. It will take more than 2.5 1kg spools of filament per cabinet as well and several days' printing. Which is one reason I haven't printed it yet. If by chance anyone out there prints this (maybe for a challenge?), please post a photo here!
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