For my Hackaday Superconference 2018 badge hack, I turned the badge into a obnoxiously loud boombox! I removed the existing 1W speaker and replaced it with a 5W speaker driven by a 7W amplifier powered at 18V.
This project page gives some more details about the hardware and firmware used for the hack!
Details
Here's a video about the badge hack! More details to come soon :D
Great video!
It sounds like it's completely frying your microphone when doing the max volume test. :)