Hey All; Although the cabinet isn't finished yet (thinking of textured paint), I have my Tumult enclosure up and running. Here are the specs: 24.5" Cube Exterior dimensions. 1.5" thick MDF, Oak Braces. Two 2500g PR's I have about 1000 watts going to it right now, but that will change in a short while when I buy a decent pro amp. First of all, working with MDF is a much larger pain than I anticipated. I have dust scattered all over southern Maine and probably most of NH too. Next time I'm going with void-free ply with more bracing. I don't have any pics, but you all have seen what the driver looks like, and besides, it isn't finished. The sound is what makes this post worth while. I have heard that PR's have a sound of their own.... I'm now a huge fan. This sub is, without exception, the cleanest, fastest, lowest bass I have ever heard. It sounds FAR better than my dual-shiva setup I had, and even on my modest amp, plays quite a bit louder. I watch lots of movies, but my real passion is music. Everything I've tossed at this sub has come out beautiful. Annie Lennox, Enya, Beastie Boys, many Trance artists, Tracy Chapman, Holly Cole......every CD I own is scattered all through my living room, and my girlfriend has to deal with me only playing a minute of a song before changing to a new CD. I'm all for objectivity, but the room influences that so much, I'll speak of my impressions first: The sub blends a lot better. It is finally impossible for me to localize the sub. I've tried dozens of positions, the lowest crossover settings, I've adjusted phases and levels until I was tired of thinking about it, even mapping out the frequency response in room wrt location, and I have always been able to localize my sub. Not this one. It blends in, and the sound is perhaps best described as effortless. My girlfriend, who is usually quite deaf to the subtle changes we all rave about, commented not only to how great it sounded, but that it mysteriously made my mains (Paradigm Studio 100's) sound better. She was confused, asking how it could impart greater clarity. The low frequency output is fairly ridiculous. Other people have mentioned it, but I'll say it again; the big difference you'll notice is that it's harder to hear tones below 25Hz. I have pretty good hearing, but 16 Hz can be played with nothing other than the sound of the room shaking. Harmonics are greatly reduced over the Shiva. As an aside, no port noise is pretty sweet too. I haven't logged data for the sweeps I've done, but the sub goes really low, especially in my cabinet, which seems to be a little larger than what most of you guys are running. In room response is not only flat, but slightly elevated down to slightly below 15Hz. It is sick! The transient response is a lot better than one might imagine given the group delay numbers. It sounds much faster than my old shiva, even though the shiva sims out at considerably less GD. Not sure why, but I'm not complaining! In short, I'm thrilled. I'll post more data when I get a chance.