Okay, maybe this isn't the millionth one, but it seems that way. It's a flexy sonosub meaning that it is held together with three all-thread rods connecting all the pieces together. I took pictures during final assembly showing its design. I'll put a web page up soon, but in the mean time, here are a couple of pictures to drool over: It's a 190 liter Tempest sub tuned to 19Hz. It's 18" in diameter (tube) and 5' tall. I just cobbled it together, but I can't calibrate or listen to it because the rest of my family is asleep (and sick) upstairs. The anticipation is killing me!!!!!!!!!!!