It is not really a finished product. It seems like a novel motor system. However the cones look crude and there is no chassis. The other thing I note that Fs is high so you won't get earth shaking bass unless you go to a lot of trouble. I note they are ultra low Q drivers and so could be driven down below Fs. However that would be at greatly reduced efficiency. So the only way I can think of to really make them useful is to load them in an enormous horn. Horn loading with the numbers I see would be really the only method to really harness their power in the last octave. Without that roll off will be north of 30 Hz. Having said that pro subs for large spaces are not known for low frequency extension.