Imagine the pranks Mel Brooks coulda pulled off if'n he'd had one of those!
Mel crawled across no-man's-land with a giant speaker, and climbed the only tree (mighta been a pole) left standing, hung the speaker pointed at the Nazis, and hooked it up to a record player and played, I think, Jewish folk songs all night.
What? Your gov't didn't issue record players to front line troops?