Just a surprising update on this:
Turns out that either the speaker had a bad tweeter in it, or I pushed it in so far that it damaged it enough to not work. I brought it back to the guy that sold it to me. (Dave at Future Sounds in Burlingame, CA)
The speaker itself is about a year and a half old. The first owner returned it to upgrade, and so I bought it about a month ago. Anyway, instead of trying to pull out the dent to see if that would fix it, Dave just pulled the whole tweeter out and swapped it for a new one--right there on the spot. That was it...no charge...no nothin'! I'd say that's pretty good service!
(I'm just glad I brought him a Starbucks gift card for being willing to look at it) :-)
Thanks again guys.