My long sub-less nightmare is over! For the past couple of years, going back to when the Shiva was new and the first sonosubs were being discussed in this forum, I've been planning on building one of these things. In fact, I bought the 12' of 16" tube and it's been sitting in my garage, waiting until the budget & my spare time allowed me to complete it. I finally was able to build the thing, so here it is: My DIY projects My intial tests (very informal, although I've made a test tone CD and used a Rat Shack SPL meter) show that it does get down low enough, with plenty of output into the low 20s. It also gets plenty loud enough for me when driven by my old Pioneer reciever - no complaints there. The only thing I've not liked about it so far is that it seems to have a bit of a boominess to it - But I haven't narrowed that down to the room, the driver or maybe even the receiver I'm using.