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Quick question: Is there ferrofluid (or other coolant) in Genelec 8351B tweeters

Like you buy a expensive car and they don't tell you how frequently you need to change the gear box oil, or if there is any for that matter. In fact they should, and perhaps make some money. Waiting to the point it manifests can't be called a best practice.
 
Hi,

First of all... tmtomh your answer and take on the subject is highly appreciated and does make me happy.
Second, I totally agree that failures would have popped up a lot if there were an issue, so I'm accepting "no use of ferrofluid." Maybe I'm deluding myself, or I really want to be with a product that does not use ferrofluid, or maybe I'm a former spoiled ATC user!

Anyway, I ordered the GLM KIT. I read a lot of mentions, and the one that repeats is "get yourself a GLM kit... it really 'unlocks' the full potential of your speakers!"Let's see.
And as a side note — and you all can call me nuts hhh — I also have in my possession a Trinnov Nova, but unfortunately, my global location does not have a return policy to take gear for a test period in my own environment. so GLM Kit is on the way.

I will upload my Trinnov Nova graph, and when I compare it to the Levimax graph, I think I'm on the safe side, at least I think so. Please advise, thanks.

And TheWoolyBully, you're right lol, this was with total appreciation to the person I talked to, not at all in any case to shed a negative light on the subject, sorry.

Well, I got the 5-year warranty even though they are ex-demo, so that's also on the safe side, lol. Again, this popped into my mind as I write: when I turned to ATC, I was so at ease of mind knowing there is no ferrofluid. It was like a victory against every other speaker out there.

Anyway, I'm very pleased with the 8351B.

Screenshot 2026-06-23 010426.png
 
OT: to my understanding Genelec do not publish any details for parts used so they can change it anytime without telling anybody. The used part is good enough in Genelec standards. That is all you need to know.
 
Yes I have complete confidence with Genelec support, were I don't have full confidence is a twitter that uses "ferrofluid" I have a believe that I will never know if something is off and I may lose all goodness from such product!! without ever knowing...

I sold my ATC SCM25A PRO MK2 for the 8351B and I'm happy as can be, but I really want that non ferrofluid witch I found amazing in the ATC
It's a kind of peace of mind....
You can simply measure the near field frequency response to check whether the tweeter is working per spec or needs any servicing.
 
Hi everyone,

Just a quick technical curiosity that's been bouncing around my head.

Does anyone happen to know if the coaxial drivers (specifically the tweeter) in the Genelec 8351B use ferrofluid or any other type of liquid cooling?

I recently bought a pair of ex-display units that are about 6 years old, so I'm naturally thinking about long-term maintenance and potential degradation.

I know Genelec designs their monitors to last a lifetime, but since ferrofluid can sometimes dry up or change properties after a decade or so, I was curious about how they handle thermal management in the The Ones series.

Couldn't find a definitive answer in the spec sheets, so I figured someone here might have the inside scoop (or has maybe seen a teardown).

Thanks in advance!
In this video
at the 8:30 minute mark you can see something shiny black in the gap. I think it's ferrofluid. This is an 8000 series, but I think it might be similar in higher series.
 
The tweeter is very similar, or maybe even the same, just mounted coaxially. It was manufactured by Vifa in the 8000 series, if I'm not mistaken, based on the part numbers. They also used ferrofluid in their designs.
 
The tweeter is very similar, or maybe even the same, just mounted coaxially. It was manufactured by Vifa in the 8000 series, if I'm not mistaken, based on the part numbers. They also used ferrofluid in their designs.
Genelec say the 83xxB drivers are Genelec house drivers
 
If they say so, then maybe it's true. I have 8340s myself. They're about six months old, and even if they have ferrofluid, I'll replace them before they dry out. From what I've read, other brands last 10-15 years.
 
If they say so, then maybe it's true. I have 8340s myself. They're about six months old, and even if they have ferrofluid, I'll replace them before they dry out. From what I've read, other brands last 10-15 years.
Yes it seems like a basic refresh when time will come... ( I'm a former ATC spoiled brat person, it is clearly my nonsense ) but if they don't 2 time win

Marc11 do you have the GLM Kit ? I received mine today and Huge Wow highly recommended
:)
 
Yes it seems like a basic refresh when time will come... ( I'm a former ATC spoiled brat person, it is clearly my nonsense ) but if they don't 2 time win

Marc11 do you have the GLM Kit ? I received mine today and Huge Wow highly recommended
:)
I don't have GLM yet, but I'll be buying it soon. They sound great even without calibration. I had considered getting the 8330 + 7350 combo, but now I know I made the right choice, as the 8340 is much more powerful and the bass goes deep enough.
I previously owned Dynaudio 52SEs, Dynaudio Focus 160s, and speakers from other brands, but Genelec outperformed them all in terms of sound quality.
 
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