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<blockquote data-quote="DanWiggins" data-source="post: 101789" data-attributes="member: 544847">It&#039;s essentially a rotary version of a Contrabass ( <a href="http://www.servodrive.com/cb.html" target="_blank">http://www.servodrive.com/cb.html</a> ).&nbsp; Invented by Tom Danley of Servodrive, it uses a servo motor to turn the diaphragm.What&#039;s the advantage of Tom&#039;s design?&nbsp; Flat BL curve, and lots of BL if desired.&nbsp; Servo motors offer constant BL over their full rotation, and can have BL values in the 50-60 N/A range.&nbsp; As such, you just play with geometry of the servo shaft and belt system (or, in the case of a rotary unit like the Cyclone with the diameter of the vane).&nbsp; Quite ingenious, and very effective.&nbsp; And you all know that flat BL is a good thing...//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifAnd yes, I&#039;ve heard Contrabasses (and other servo-driven subs like the BT-7) before, spoken with Tom and the gang at Servodrive, and even spent an afternoon there checking out their stuff.Dan WigginsAdire Audio</blockquote>

[QUOTE="DanWiggins, post: 101789, member: 544847"] It's essentially a rotary version of a Contrabass ( [URL="http://www.servodrive.com/cb.html"]http://www.servodrive.com/cb.html[/URL] ). Invented by Tom Danley of Servodrive, it uses a servo motor to turn the diaphragm. What's the advantage of Tom's design? Flat BL curve, and lots of BL if desired. Servo motors offer constant BL over their full rotation, and can have BL values in the 50-60 N/A range. As such, you just play with geometry of the servo shaft and belt system (or, in the case of a rotary unit like the Cyclone with the diameter of the vane). Quite ingenious, and very effective. And you all know that flat BL is a good thing...[IMG]//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif[/IMG] And yes, I've heard Contrabasses (and other servo-driven subs like the BT-7) before, spoken with Tom and the gang at Servodrive, and even spent an afternoon there checking out their stuff. Dan Wiggins Adire Audio [/QUOTE]

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