My brother and a friend used to get high and tinker and they concluded that if you glue toothpicks on a floppy cone in a spiral pattern (much like you see on headphone diaphragms) you can get a smoother sound. The only test equipment they had was their "augmented" ears, so.... the inverse of the idea appears to also work well... 
MisterTwister said:
I have no experience regarding metal cones but my Vifa P21 got better with silicone strings, however it did not take away the break up of the cone completely.
I have no measurments to confirm it, so take it for what it is. Purely subjective opinion.
They may been better with slicing but not reversible. In the end I realized I was trying to use them too high in frequency with beaming and so on.. It was easy to take away the silicone anyway.
I will try slicing on cheaper woofers when funds permits an ob speaker project.
You have a real nice result with your experiments and backed up with measurments. Good work!
Regards,
Peter
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