Sound and wave propagation is such a fascinating subject to me, but I have to say that I abnormally aspirated my espresso this morning when I saw the 2 Japanese guys with their horned binocular head gear and the expressions on their faces...That pic is Ripe for Memeage! And honestly I would love to hear those giant tuba's bring down the walls Jericho. Using them in reverse would need some wind, but Wow what a sound.

Excellent subject and pics and there is a lot of modern stuff out there for listening and LF propagation. The embassy in Russia comes to mind. Still giggling, though!