Sounds cool, I'll bet your speakers are awesome. The 2115 is old, that's for sure. In fact, you can't even get recone kits for it anymore, so it has become really rare. The F200 is definitely more feasable.I know that Fostex makes good products, 'cause I've heard some very nice sounding Fostex speakers. The single driver speakers I've liked the most in the last couple of years have used Fostex drivers. Who is doing their engineering over there? Do you know who any of the people are doing R&D at Fostex? I'm thinking there must be some clever folks there because they have made some very fine speakers.
That's one thing about JBL, their R&D team is comprised of some very good engineering talent. I'd say they've kept themselves in pretty good shape as far as advances in technolgies and materials are concerned. The list of engineers and people involved there reads like a "Who's Who in the Audio Industry."