Haha... on the note of 1812 destroying speaker... I used to be in an orchestra, and we performed 1812 in an outdoor environment. No we didn't use cannons, just bass drums (in substitute as cannons). She managed to break the drum skin. It made a "crack" sound, and we were all very surprised by that, and saw the percussionists all had a shocked expression on their face, while the bass-drummer quickly recovered and turned the drum over to hit on the other side... right on time for the next entry.