As the facts unravel I’ve found this to be true: Tweeters don’t tweet by themselves as the design of the crossovers and any element the designer utilizes to make ’em work seems to trump (sorry, I hate that word) the physical material…I’ve had ribbons, horns, soft domes, magnesium/aluminum, etc., and some are bright, others not so much…some more coherant than others, and all having seemingly zero to do with the material they’re made from.