Wow that is sweet! How does it sound? Sounds good over the video..
For being in a small metal can not too bad I may put some holes in the sides to channel the air for bass.
Did you follow any instructions? Or just go at it yourself.
I had seen a full sized keg used as a speaker and had this keg from a party, I started it a few years ago and only got round to finishing it properly with a proper amp and new speakers. The metal is really tough to cut the holes out as well. Total cost is around £40 but is totally worth it. Speakers £15 Amp £10 12 volt 7.2ah battery £15