i knew thoses speakers, they are perfectly looking like the ones Bose use in their soundlink mini, BUT they are not, they just sound owfull, big lack of bass and load of saturation due to the fact that they aren't adapted to the amp
3$ Disk Sander
Cutting Things in Half
Dice ATTINY85 Charlieplexing
Small Portable Speaker Covered With Wool
Make yourself an aluminum rose!