Thanks, Steve P. The Heresey makes great sense - never really thought about it. It's almost like a mini Cornwall anyway. Looks like it'll even fit on top of my TV. Now, I'll I need is one in walnut...
Probably will give Trey a call. I was in the speaker last night (doing the caulking cord thing) and checked, cleaned and tightened all the connections to the crossover, so you're probably right about it being the tweeter itself.