Thanks for the explanation, although I don't understand all the technical details, I get the gist of what you said. I can certainly see the difference on the curves. I did do an A/B comparison with the old block cap hooked up in one and a new in the other. Sometimes there wasn't much difference in sound, but other times it was very apparent, such as acoustic guitar and some vocals. I would say the one with the new cap sounded a bit 'boxy' compared with the old cap. I'll probably keep these relatively stock, but would definitely try the mod if I run into a second set of these. Interestingly enough, my 4x's have the tweets in phase with the woofers(green wire attached to wiper, and yellow to #2) they're not the super early cross hatch woofers, but must be shortly after. I'll probably start another thread soon to document some of the differences on mine.