My understanding of the history of the cyclone is that the original design of it was wayyyyyyyyyyyyyyyyyyyyy better than the version Phoenix Gold released. Apparently productions costs would've been too high and they skimped out on the materials and overall led to a product that the designer was not happy with. I still have been yearning to hear one - but hell I can't even find an XXX to listen to.
"It appears that the product is discontinued. I wonder why. They couldn't tell me. I tought it was rather fun to buy one and test it, but alas... You might find it interesting that our own Tom Danley designed the Cyclone and ServoDrive liscenced it to Phoenix Gold. Unfortunately Phoenix took too many design liberites before final production and all the quality aluminum parts in all prototypes became cheaply molded plastics with poor tolerances and rigidity. Also, the original design was for an IB use, and they then tried to change it to work in many applicaitons and ended up with something which wasn't quite optimal for any alignments at all. For what it's worth,
Tom had a similar pair of these units loaded into a crawl space which had response down to 11_13Hz (I forget). The final Cyclone ended up having some reliabliity problems along with odd parameters for the car market, and ultimately died. Interestingly, I believe one of the Hi_Fi rags had noted a Cyclone in a sealed box to be what he thought was a reference subwoofer and one of the top innovations on the market... and this was a while after the product was out"