Ah, I definitely need to do the foam pipe tweak! I think that and wrapping the horn in the above mentioned material, will be next on my tweaks list. I now understand that my K400 horn is the same size as current production, but made of metal instead. I don't plan to seek out the current 401 version; I think damping mine will surely suffice. I currently own some large 2" format horns and drivers from EV, but my girlfriend prefers the looks of the Klipschorn tophat, not a monstrous ABS horn sitting on top. I'd like to keep these Klipschorns, not Frankensteins ;-). I'd love to plop my big white while EV horns on top, but it ain't happening. I happen to like the Klipschorn sound, even with the older horns. I'm not in a hurry to lose the K77s, although the Crites sound like a good tweeter. I probably already own some variation of his tweeters, made by Foster instead of Eminence. I'm curious about crossover changes.... What's can I do with my AK2? Thanks for the great input!