OK, I got the ferrofluid from parts express and had time this morning to recharge the old tweeters - the first one I did was stuck when I pulled the tweeter face off from the magnet assembly I ruined the voice coil - the second two came apart very easily - I was also surprised that looking at the tweeters 2 of them are h715's and the other is a h539 so Meridian used different tweeters in the speakers (DSP5500's) -

One of the tweeters I pulled apart had very little fluid in it compared to the other - it was also thicker - the kit from parts express comes with blotters to take up the fluid in the magnetic gap - the ferrofluid goes in super easy - just cut the end and put it in the gap and it sucks right into the gap.

I've been playing my 5500's with the h1212 replacements in them and they sound amazing now, better than the other I speakers I have - I don't detect any abnormalities to the sound - the air, and transparently is there now.

I'm going to put the original tweeters back in the speakers later today to see if they now sound as good as the h1212

Looking at the tweeter upon taking it apart I don't see anything that is super special about it that would be different from a replacement (h1212) especially if the electrical plot is comparable - sound wise they are a ton better than the old originals...

1. 568.2mm & 3xDSP5500 2. 565/562 & DSP5000's 3. Director & 568.1 & Edge Amp & Klipschorns