Cherry,
Sorry, no can do, but we can send you to the Munich show where Sibatone (Korean) does a display like that with one set on the floor, the other inverted and suspended in the air. In the U.S., if you ask nicely, Deja Vu Audio in Northern Virginia might play their gigantic 16A horn (you can walk inside if you crouch just a little bit). That horn has a tweeter on top, but no woofers attached, so the bass is thin (555 driver is run full range).