Having also seen the graphs from Madisound, Sean and I are in agreement once again.
Despite Mitch's initial trepidation and warnings from some here on Audiogon, this was a classic no brainer. In fact, I feel so STRONGLY about this, I would have dropped the tweeter in before doing the crossover mods.
What a lot of people do not realize is that one of the BIGGEST things that separates the good speakers from the great speakers is taking care of the treble. Outside of the cabinet and crossovers, I feel the next thing that a budget chops from a speaker is a reference level tweeter. A $10 tweeter will give you detail, which can initially impress. A $100 tweeter will give you that detail combined with a relaxed sound that puts into the audiophile's mind that they are listening to a very polished product. The effects on listenability that removing a harsh treble does cannot be understimated, the speaker itself becomes so much more relaxed that one often underestimates it.