Hi
Anyone here have knowledge or experience with Ferrofluid used in dome Tweeters from either
Dynaudio or Morel?
Specifically, the exact type used in these tweeters (& who sells it) and whether it needs replacement after 20 years or so?
Thanks
Anyone here have knowledge or experience with Ferrofluid used in dome Tweeters from either
Dynaudio or Morel?
Specifically, the exact type used in these tweeters (& who sells it) and whether it needs replacement after 20 years or so?
Thanks
you should be able to see the fluid with a visual inspection
or take a some thin copper wire and run it round the slot
i got seas about 15 years old, still ok.
or take a some thin copper wire and run it round the slot
i got seas about 15 years old, still ok.
Hi. Thanks for the good word about your Seas.I haven't disassembled-yet.
Unfortunately, employing a wire to evaluate the type of ferrofluid is probably no more informative for this layman than using my car dipstick to guess the composition of the motor oil(he tastes it "hmm,30wt synthetic")
🤔
There are several different products being offered by the likes of Parts Express(USA) and also Speakerepairshop(Netherlands),
but there is no data on which one would be closest to the fluid used by Dynaudio and Morel in their tweeters.
Also hoping to know if age or frequent useage(or both) either degrade or destroy the ferrofluid
& what's needed to restore original tweeter spec's, vs replacement. I hope to gather as much knowledge on this as needed before using (possibly unnecessary) invasive procedure "first do no harm". 😷
Finally, I have learned that Dynaudio no longer supports the DIY market.A message to Morel resulted in referral to buy a replacement tweeter, rather than any information about ferrofluid.
Come on guys-someone has to know (and it's not "secret sauce').
Any help or guidance is appreciated.
Unfortunately, employing a wire to evaluate the type of ferrofluid is probably no more informative for this layman than using my car dipstick to guess the composition of the motor oil(he tastes it "hmm,30wt synthetic")
🤔
There are several different products being offered by the likes of Parts Express(USA) and also Speakerepairshop(Netherlands),
but there is no data on which one would be closest to the fluid used by Dynaudio and Morel in their tweeters.
Also hoping to know if age or frequent useage(or both) either degrade or destroy the ferrofluid
& what's needed to restore original tweeter spec's, vs replacement. I hope to gather as much knowledge on this as needed before using (possibly unnecessary) invasive procedure "first do no harm". 😷
Finally, I have learned that Dynaudio no longer supports the DIY market.A message to Morel resulted in referral to buy a replacement tweeter, rather than any information about ferrofluid.
Come on guys-someone has to know (and it's not "secret sauce').
Any help or guidance is appreciated.
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I recently inquired about Dynaudio Ferrofluid (aka Magaflex per Dynaudio spec sheets) and didn't find much info but did conclude it wasn't worth pursuing. IMO if it were possible to replace the Ferrofluid it would likely change/degrade the imaging and clarity that the drivers were known for. You may have better luck with Morel. Some Morel tweeters have replaceable diaphrams and I've seen references to Ferrofluid replacement kits. I contacted Dynaudio customer service last July regarding Magnaflux lifespan and received the following reply :
"D21, D52, D54 and 21W woofer are no longer available, unfortunately ... Ferrofluid can usually be replaced by a skilled technician, but I don't know in this particular case. And I would say yes, the drivers may have reached their expected years of service."
Ferrotec will get you situated with the proper fluid. They are VERY helpful and will get you set up with the correct fluid. They are more than likely the ones who made the original fluid.
Fill out the form on their site: https://ferrofluid.ferrotec.com/applications/ferrofluid-audio/
Here is also some good data on their different fluids for different applications: https://ferrofluid.ferrotec.com/products/ferrofluid-audio/
Fill out the form on their site: https://ferrofluid.ferrotec.com/applications/ferrofluid-audio/
Here is also some good data on their different fluids for different applications: https://ferrofluid.ferrotec.com/products/ferrofluid-audio/
Thanks to you both for the help and encouragement.
Just glancing at Ferrotec's web page shows that there are so many variables, it mightn't be wise to buy some off-the-shelf generic vial from one of the non-specialists in the retail market, without knowing what's in the bottle.
Once I gather more knowledge on this subject I might reach out to Ferrotec if I do indeed need an "oil change".
Thanks again.
Just glancing at Ferrotec's web page shows that there are so many variables, it mightn't be wise to buy some off-the-shelf generic vial from one of the non-specialists in the retail market, without knowing what's in the bottle.
Once I gather more knowledge on this subject I might reach out to Ferrotec if I do indeed need an "oil change".
Thanks again.
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This is a very helpful topic for me! I have several unused Dynaudio drivers (two each D21AF, D54AF, and 17W75), which are about 30 years old, and I don't know if I should bother using them or not, specifically because of the potential ferrofluid problem. I bought them brand new, and they've been sitting in their boxes all this time.
I wouldn't worry about the woofers. Connect drivers to any audio speaker output, using clip leads(put ~25uf n.p. capacitor in series with mids/tweeters) and listen at lower volumes(noise works best I keep an old FM table radio around for quick checks). You should get roughly similar loudness from all mids & tweets, which should tell you if one or more are off. Woofers will be 2-3dB less sensitive, but lack F.F.
I would like to hear how this goes.
Thanks.
I would like to hear how this goes.
Thanks.
I bought my D28/2 19 years ago 2nd hand and their condition is unchanged. There is no signs of any abnormal performance.
You will learn what a factory condition of this unit should be like if you check datasheet, FR and Impedance especially.
Ferrofluid increases power handling by taking the heat away from voice coil to the surrounding structures, damping
the resonance peak (cca.900Hz) at the same time. Impedance of such unit is about 10 ohms at Fs. FR at defined drive voltage
should also tell you if it works alright. Do these 2 tests, and you will know for certain.