I think the Freedom is looking for subjective results that sound satisfactory to him/her, which current drive somehow seems to be able to provide. However, for anyone looking for measurements using the (shunt) technique, here is the paper by the same author cited in the opening post.
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Re: speaker design, note the VC former design. In the Mills and Hawksford paper above they mention that some of the drivers with non-condictive bobbins achieved 30dB improvements in HD, vs a more typical 10-18 dB for drivers with metal voice coil formers.
So, apparently, even though the conductive bobbins were sliced to reduce eddy currents, the residual currents still had an adverse effect that outweighed any possible benefit from equalising temperatures along the length of the coil. I'd speculate that conductive formers could make a more positive impact at much higher power than what they were testing at. Also, the eddy currents could destabilise the cone by applying forces at various non-right angles.
So, apparently, even though the conductive bobbins were sliced to reduce eddy currents, the residual currents still had an adverse effect that outweighed any possible benefit from equalising temperatures along the length of the coil. I'd speculate that conductive formers could make a more positive impact at much higher power than what they were testing at. Also, the eddy currents could destabilise the cone by applying forces at various non-right angles.
