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Author Topic: Who was using ferrofluid in 1973?  (Read 1417 times)

Rick Earl

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Re: Who was using ferrofluid in 1973?
« Reply #10 on: September 03, 2019, 03:13:21 pm »

I am aware of EV using it, but not sure of timeline.
https://www.electrovoice.com/binary/DH1202%20EDS.pdf
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John Roberts {JR}

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Re: Who was using ferrofluid in 1973?
« Reply #11 on: September 03, 2019, 04:31:56 pm »

Ferrotec responded to my email in 36 minutes! Wow.

Marketing specialist Vanessa Rene at Ferrotec says that Bob Berkowitz of Acoustic Research began studying ferrofluid in 1972, using it to damp resonance of a tweeter. Fred Becker and Lou Melillo of Becker Electronics were also early adopters in 1976. Panasonic was the first Asian manufacturer to put ferrofluid in commercial loudspeakers, in 1979. The field grew rapidly in the early '80s, with Meyer Sound, Apogee Sound and many more jumping in.

Other archival sources show that Dana Hathaway of Epicure in Massachusetts was using ferrofluid for tweeter damping in '74, and he noticed the cooling mechanism.

By 1979, Showco was putting ferrofluid in woofers for the cooling effect.
https://books.google.com/books?id=fAEAAAAAMBAJ&pg=PA61
Sounds like the right people to ask... I had a pair of AR4 speaks back in day,,,,

I suspect Rat Shack may have tried to use FF as a bandaid for small drivers that released their smoke too often.

JR
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Doug Fowler

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Re: Who was using ferrofluid in 1973?
« Reply #12 on: September 03, 2019, 09:29:06 pm »

Surprised no one has at least mentioned Community yet.
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Riley Casey

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Re: Who was using ferrofluid in 1973?
« Reply #13 on: September 03, 2019, 09:39:01 pm »

All the Community horns I remember from the FRC, Leviathan and plastic radial horn days were strictly bring your own drivers.

Surprised no one has at least mentioned Community yet.

Chris Hindle

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Re: Who was using ferrofluid in 1973?
« Reply #14 on: September 04, 2019, 12:03:53 am »

All the Community horns I remember from the FRC, Leviathan and plastic radial horn days were strictly bring your own drivers.
Ya, I had 2441's on Community BRH90 large format horns.
I think the first time I saw FF was with an EV driver. DH-1A maybe?
Chris.
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Tim McCulloch

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Re: Who was using ferrofluid in 1973?
« Reply #15 on: September 04, 2019, 12:15:21 am »

Surprised no one has at least mentioned Community yet.

The spec sheets online for the VHF100 and M200 are dated 1999 and make no mention of Ferrofluid... BUT... spec sheets for loudspeakers *do* mention Ferro, specifically the SLS9xx series (which use those drivers).  Anyone remember when the SLS launched?  I'm pretty sure it was after 1979...
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lindsay Dean

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Re: Who was using ferrofluid in 1973?
« Reply #16 on: September 04, 2019, 01:32:21 pm »

Actually Radio Shack used ferrofluid in the Mach 1 series of loudspeakers.
 to my memory those things sounded pretty good for what they were
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John Roberts {JR}

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Re: Who was using ferrofluid in 1973?
« Reply #17 on: September 04, 2019, 02:45:19 pm »

The list of who didn't use ferro fluid (ever) is probably shorter than the list of who did, but that wasn't Bink's question.

JR
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ProSoundWeb Community

Re: Who was using ferrofluid in 1973?
« Reply #17 on: September 04, 2019, 02:45:19 pm »


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