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Old 19th December 2012, 11:42 PM   #1
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Default New Use for Ferrofluid?

I just read an article in Popular Science about the speakers in Sony's BDV-N790W home cinema system.

"Designers replaced a key speaker component, the damper, with a microns-thin layer of ferrofluid.... The damper ensures that the spring [??] doesn't wobble and that the [driver] diaphragm doesn't overextend. But dampers cause friction, which creates sound-distorting vibrations and can lower a speaker's overall volume. Ferrofluid holds the coil and diaphragm in place, without friction. Without a damper in the way, the speaker can reproduce louder - up to three decibels - clearer sounds across all frequencies."

Sony claims that these speakers play louder and more clearly than any others their size. They probably still sound like cheap crappy home theater-in-a-box speakers, but would anybody care to dissect this?

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Old 20th December 2012, 12:00 AM   #2
ScottG is offline ScottG  United States
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"Damper" = Spider..

It's been done several times before - most notably offerings from Ted Jordan.
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Old 20th December 2012, 12:37 AM   #3
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The JBL/HK 25mm "FR" (1st seen in the 2nd major rev of the iMac) & the 35mm version both had ferro-fluid spidders.

Mark Audio Alpair 5 (Jordan J6) is a good examle too...

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Old 20th December 2012, 12:46 AM   #4
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So it's not an innovation for Sony, as the article implies. Not surprised.

Well, is it an "audiophile" improvement? It apparently is not very widespread.
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Old 20th December 2012, 01:02 AM   #5
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Quote:
Originally Posted by sdclc126 View Post
Well, is it an "audiophile" improvement? It apparently is not very widespread.
I believe only useful for small drivers and tweeters.

On a small FR you can warm up the voice coil and expell some of the fluid/oil and they quickly deteriote from there.

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