Very Long Throw Drivers

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Think I'm probably off on my own here in my obsession with non voice coil actuators for bass reproduction. Even Danley Soundlabs is using conventional drivers these days.

My current thinking on this is that I should run the numbers on the PA-15 actuator as it has low development burden compared to making my own actuator and I presume the fully instrumented higher speed actuators are way too high cost. For the 'cone' I was thinking of using foam insulation board as its very light for its stiffness and I can cut it easily. For the frame aluminum interlocking channel and for the surround cut up inner tubes (although this is not ideal as they would be not stiff enough and a bit lossy). Initially I would run the actuator open loop.

The missing bit I didn't know how to work out was the spring force felt by the cone but I found this:
http://rmsacoustics.nl/papers/whitepapersoundgeneration.pdf
which looks to cover it.
 
Nah, it was a rotary motor that was driving some cones via a belt.

The belt would eventually stretch out and need replacement.

Chris

In Profile: Tom Danley, Exploring The Possibilities Of Audio Technology - ProSoundWeb

The servo drive used a brushed DC motor. A modern version using a BLDC motor would be better in every way. The belts would still stretch though and the suspension would need to change to allow more xmax.

Also from the man himself:
Why no other "motor" driven designs ie BassTech7
 
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