Hieronymoius, exactly! Excuse me for turning the thread but ... all those Spinal Tap bits were of course based on true stories. That particular one where the Stonehenge props were sketched with " instead of ' was reportedly something that happened to Toto on one of their trips to Japan. Jeff Porcaro, who was also a very good graphic artist, had drawn out what they wanted to be the backdrop for the band - that powerful looking sword with ornamental flourishes, etc, etc... but he had marked the size in " instead of '. When they got to Japan and the backdrop was flown in, the entire illustration was about 6 feet wide.
Back on subject, I remember seeing some 30" (inch) EV speakers somewhere, I think they were built for movie theaters. Gotta wonder about the specs of these enormous drivers. 7-28hz range perhaps? Don't laugh, that's 3-octaves! Ha! But you'd need a "normal" subwoofer to cover the next couple octaves.
Jimmy J