I've just come across this ground shaking project:
"Royal Device has on its own developped and built in Italy the biggest subwoofer of the world for an AUDIO/VIDEO room that can be also considered as the greatest AUDIO ROOM for private music listening of the world. The Royal Device audio room belongs to Roberto - the audio designer who made it."
Don't you just love these "greatest (...) in the world"?
"Science draws the wave, poetry fills it with water" Teixeira Pascoaes