There's a video of some 8 going around, IIRC it had a TC motor design? I might be wrong. In the video, some guy is sending some 3k rms to the little thing, beating the hell out of it, free air, and it didnt pop
I remember talking to the guy a while back, if you want me to find that info I can snatch it for you I'm sure. Didnt look badly designed, and they were as cheap/cheaper than RE RE 8's IIRC