I recently acquired a second pair of oak KG4, which I figured I'd possibly stack for fun. I replaced the old electrolyic caps and installed Crites Ti diaphragms. I noticed that one pair has ferrofluid in the tweeters, while the other does not. I don't recall my other KG4 pair from long ago, having the fluid. I left it alone for now, since it wasn't dried up and still wet. Do any other KG4 users have the fluid, or can comment on if it makes any audible difference? Thanks!