Quarter Wavelength Bluetooth Speaker
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Capitalizing on some basic physics you can turn a relatively cheap speaker into a much nicer sounding one.
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This is a stereo Quarter-Wave Speaker I designed in fusion 360. I am listing the speakers I used (bought in bulk at $0.48 each) and the Bluetooth amplifier I used ($13). For very old CRT tv speakers, this little thing puts out quite a bit of volume and the bass is actually pretty good. While my calculations of the wavelength are fine, the pathway might not be 100% optimal, but its very close.
Printed at 0.32 layer height for most parts, but the speaker cover/grill is 0.08 layer height. Everything is in Blue PLA and fits fairly well. I used hot glue to hold the side panels on (and to make it more air-tight). - I probably could have used some small magnets to make the panel removable to show the innards, but I did not have any on hand and wanted to finalize the project to demonstrate for my class.
Below are the parts that I purchased (Speaker was $0.48 in bulk). The bluetooth amplifier was $13.99. The amplifier comes with a barrel power connector - and I used it to hook up to a ryobi 18v battery for portability - but I also grabbed an AC adapter for classroom discussion and use ($13.99).
https://www.parts-express.com/YDT613-68-2-1-4-x-5-Paper-Cone-Full-Range-Speaker-8-Ohm-77-289-2314