2. speakers
  3. 155310-24

Dried up Ferrofluid?

What causes ferrofluid to dry up?  Heat, usage, age?  Is there a usual shelf life, as in, do most 15-20 year old tweeters that originally used ferrofluid, need new ferrofluid?

How is it checked, where is it bought, is the replacement generally the same from tweeter to tweeter?

Thanks ahead of time for any info regarding this!  I figure that there are quite a few good speakers out there that are getting up there in age so this may be something I’ll want to learn to do!
b_limo
bigkidz
3,416 posts
 
Contact Bill Legal at Miller Sound in PA if you want someone to do them for you,

Happy Listening.
rx8man's avatar
rx8man
1,484 posts
 
http://www.millersound.net/
bkeske's avatar
bkeske
5,597 posts
 
Bill is excellent and highly recommended. Just rebuilt one of the acoustic couplers from one of my Vandy 2CE Sig’s. Very very reasonable and a great guy.
quincy
374 posts
 
So, how does one know if their ferro fluid is no longer viable?
ljgerens
161 posts
 
As the ferrofluid dries up, the speaker’s high end becomes dull and loses some sparkle. It may not be evident unless one compares it to a speaker with fresh ferrofluid. Typically ferrofluid lasts about 15 to 20 years with normal use. KEF recommends replacing ferrofluid after 15 years. If you go too long with dried up ferrofluid, the tweeter may be permanently damaged. I did the T33 tweeters in my KEF 104/2 speakers a few years ago and it made a significant difference. It was a fairly simple and straightforward process and cost about $15.
More to discover