Sorry for the very late reply. I did not see your message in my mailbox. I teach art at the secondary level and I also developed an AP Art (Drawing) program so that students who are advanced can receive college credit.
Building instruments is a great hobby is it not!?!.
I finally finished modding my cube. I get an occasional buzz from the cabinet(these where not designed to take apart!) The only other negative is that the batteries don't last forever like they did with the old speaker. Happy with the mod overall. I'm sure you have built more stuff since you last messaged me.