What is your favorite material for loudspeakers?

From what I heard carbon nano tubes are suspected of being carcinogenic. I wouldn't consider its use till its proven safe. Same with Teflon capacitors.Why don't we just go back to the old PCB caps;) Since hi-heat and Teflon will produce toxic gas. Thought where heading to a green future but carbon nano tubes, Teflon caps, beryllium domes, cobalt mags, lead solders,now the plastic coats another suspected carcinogenic are we building future toxic waiste? Why I use silver oil caps, natural french polish finish and birch ply from sustainable forests and using less toxic glues. When I use veneer I buy sustainable harvest veneers.I try to purchase drivers from country's with fair labor practices and better environmental standards but still its hard to avoid using some Chinese parts but I do try to avoid them if possible.

John

You take speaker building to a conscientious high.
So what is the brand name on your speakers? or do you just make them on a custom basis?

KCS loudspeakers mostly we build for research but for kicks I offer home loudspeakers or custom builds.