Ok so I just bought four KP-2500-C speakers (the owner wouldn't sell two) to use the tweeters for my Forte IIs. They definitely sound better now than with the vifa tweeters, at least the sound has opened up. I also finally got a chance to install Bob Cites' titanium diaphragms, which I had laying around for a few months now. I must say, although they maybe sound more detailed, they also sound a bit more sibilant, compared to the stock K-79-K diaphragms. Does anybody else share this experience? I also upgraded the crossover caps, which makes them sound even a little brighter still...