What does a bad tweeter sound like?

Whenever I "question" a drivers performance or simply want to conduct my own "test", I find that a 20 - 20Khz audio sweep is useful.
https://www.youtube.com/watch?v=PAsMlDptjx8

Thanks all....I just removed the tweeter from my Vandersteen 5A (left side) and am sending it back to Vandersteen for a rebuild.  I hear just as you describe...louder on that speaker, fuzzy and metallic on some frequencies.   I thought it was the midrange, speaker, but removed that one last month, got it back rebuilt, and the noise is still there.  I hope its the tweeter.

I just found the 5A crossover. :) I would leave it alone unless you are already pretty well versed.

The 5A uses batter biased caps int he mid and tweeter sections. Pretty funky if you ask me. :)