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The author of that paper, Dan Wiggins, used his patented Parthenon motor structure connected to a 2' by 2' piece of plywood to be used as a cone. The motor actually running. Dan posted most of his finding here at the forum when there was a very active DIY section. I learned more in the...

While you are correct that you lose some punch, it is not because of the control from the motor - http://diy-audio.narod.ru/litr/WooferSpeed.pdf . A lot of these new motor designs implement inductance limiting technology so the "woofer speed" and "low power motors" really don't apply. A sub...

There are a few guys at another forum trying to create a DIY version of the rotary sub. Until then, if you don't go DIY then you need something like the Reaction Audio Gamma 21 or the Deep Sea Sound Mariana 24. As I mentioned earlier, big drivers. Mach 5 Audio is coming out with their 32"...

You need large drivers, large ported boxes tuned low and large professional amps. How many? That depends on how much room you can spare. It's basically about moving air. Back in the late 1990's we were excited with Dan Wiggins introduced a 12" sub driver with 16mm of excursion. In the last...