Latest project in the category "Is it actually useful or just an elaborate #shitpost?": #USB2Speakon!
It's a fully self-contained, USB-C-powered, 2-channel DAC + 5W Class-D amplifier inside a #Speakon connector.
Use it to connect your phone / laptop to any passive loudspeaker and enjoy surprisingly loud music (probably enough to host a room party)
(GitHub link for the interested: https://github.com/RainbowLabsDE/USB2Speakon )