I've got a Tumult.. at the moment though I think it's underpowered (I'm using a 500 watt amp.. it really needs 1kw or so)

It's in a 24" cube (outside) and it sounds wonderful... When I first used this thing I noticed bass in all kinds of things that I hadn't heard / felt before... and noticed EVERY place in my house where things were loose (pictures, drywall).. I had it up a little too high at first, but now it's calibrated to be a little higher than the rest of my speakers...

It's actually a fast driver.. it integrates well with my Magnepan's (they're crossed at 60hz)

I picked it by reading lots of reviews and typing with some of the guys on Madisound's forum...