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Awhile back I had a conversation via email with Tom Danley concerning the Phoenix Gold Cyclone that he developed for Phoenix Gold and the car audio market. They were not well built by Phoenix Gold with some crucial parts made of plastic (although he spec'd aluminum in his prototype) and were not able to withstand the forces for long. They eventually started to rub making them useless. He did have a larger prototype that he had hoped to eventually come back to market with but I have not heard of it being realized. 

In a particular experiment with these smaller cyclone rotary woofer he was able to have response flat to 10hz with it being vented to a crawlspace. That was just one rotary woofer. It had a fs around 10hz.  It also had no power compression as the wire part (wound on the stationary
laminations) takes 30 min to heat up instead of 5 or 10 seconds or so for a voice coil.

It would be interesting to find out if the larger ones he prototyped will eventually be built but I think his tapped horn ULF boxes worked out so well for him that it might have sidetracked him.

Rerurn to Romy the Cat's Site