Hi there. I own 2 tempests, only one in use. It's in an adire alignment sonotube. I was originally planning on building a second in the same design, but looking at the size of the beast, I'm not to sure if I'd be able to fit it! Plus, reading a thread recently in this forum, about having dual subs in a room and all the nasty cancelation issues and such, I don't have a meter or a BFD to do anything about it. It's in my front left corner, and the best 'other' place (for the second) would be either to the left or the right of the couch. Now, since I have 2, and I'd like to put both to use, I came to thinking. I still have a 8 foot tall section of 20' sonotube to make into whatever I want. I could turn it into a push pull sonosub! One on the top sticking with it's magnet to the top, visible to all. (Some may think it'd be ugly, I think it'd look quite.. interesting, no WAF to worry about here) And the bottom driver with the magnet sticking up into the tube. (I think that's right..) Would that 'work?' The adire alignment sounds excellent to me. It's the first subwoofer that's actually worked with 'my' taste in music. (Punk, hardrock) Previous, I had a Velodyne CHT 15. It was *very* sloppy sounding compared to this. Would I gain any sonic improvement (I really don't see how I could gain any, I'm perfectly happy how it is) More output? Less cone excursion? I could either make it sealed, or vented. Offer your thoughts, this is all in my head for now, so I haven't even started designing anything yet! Thanks!