I don't know if anybody has ever seen or heard these subs. But I bought one from a friend for 50 bucks just to play around with it. Most of the crap I have seen from ultimate ***** balls. It's usually cheap, and crappily ( if that's a word ) made junk. I built a 1.5cuft sealed enclosure and put it in it. Powered it with a bd500.1 and this thing sounds awesome. I just about wet myself with excitement after hearing it If you ever get the chance to listen to one. Take the time to listen surprisingly they sound good.