Per the review (referring to the 8" woofers):
The aluminum layer provides a light but strong platform for the ceramic layer and also provides additional damping due to the differing densities of the materials. I can’t be sure of how well it works versus a plain aluminum cone, but I am sure Klipsch would not go through the trouble of anodizing all of their cones if the effects were insignificant.
I agree, but could totally see Klipsch going through the trouble of anodizing their cones purely for cosmetic reasons! "Copper and black" is their signature descriptor for their speakers! So I would venture that their marketing department may have determined that anodizing the cones would have
a significant effect on sales!
Klipsch impresses me as a company fully aware of the psycho-acoustic benefits of a speaker looking like it sounds good! I think they would not hesitate to spend the money on the anodization even if there was no performance improvement!
That said, the material properties of ceramic are so radically different from aluminum, it probably does impact the performance significantly (in a positive way), as well. After all, isn't that more or less what the Infinity CMMD drivers are?