DVDdoug
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Probably because they know it's aluminum... No blind listening tests?I’ve read some reviewer comments about how much they dislike aluminum tweeters.

There are lots of variables, trade-offs, and design decisions, and every speaker sounds different and we don't know how much of the difference can be attributed to the material choice. That's true for speakers, amplifiers, cars... everything...
And of course, the manufacturer will tout every design decision as a feature or advantage.
Here's a quote from Amir:
I don't know why people are so fascinated with how some speaker/headphone is made. What matters are the results.