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Old 23rd September 2006, 05:27 PM   #11
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Disregarding expense, I'd love to see say a woofer's magnet replaced by a same size neodymium it'd probably be hundreds of dollars, and would probably kill something if its not sheilded. I'd expect a definite increase in performance.
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Old 23rd September 2006, 05:28 PM   #12
poobah is offline poobah  United States
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I got the mumble part...

What about the flux modulation?

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Old 23rd September 2006, 06:08 PM   #13
AndrewT is offline AndrewT  Scotland
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Hi,
Quote:
I'd expect a definite increase in performance.
I'd love to know which T/S parameters depend on flux density. Then see what effect that would have on the performance.
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Old 23rd September 2006, 06:10 PM   #14
poobah is offline poobah  United States
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I would speculate that the weight of a conventional ceramic magnet coupled with the larger diameter of the voice coil would both be good things for woofer.

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Old 23rd September 2006, 06:36 PM   #15
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In PA applications neodymium is used to make drivers, that for a given performance will have about half the weight of the ferrite versions. For a double 18" the difference will be around 12 kg (25 lbs) which can make the difference between one man or two man lifts.

Also since the introduction of neodymium the decrease of Qts is encouraged (often in midbass units).

Wkr Johan
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Old 23rd September 2006, 07:55 PM   #16
v-bro is offline v-bro  Netherlands
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A decrease of Qts indeed, as can simply be seen on pic's in brochure's. Drivers tend to have lower Qts when haveing a larger magnet.

An other advantage -seen from an "audiophile" point of view- I would recon is less air-flow noises and reflections within the driver.

Where less reflections will probably only be an advantage in mid to highrange applications and less air-flow noises in bass applications (dipoles and ripoles!).

I have two neodyme magnets from a Bowers and Wilkins "Nautilus" , the magnet poles in them are very uniquely shaped (drilled through) obviously to decrease reflections. (sort of reversed horn-shape).
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Old 25th September 2006, 02:33 AM   #17
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Thanks for all the feedback, much appreciated!

I was going to remove the post as a forum search shows the topic has been
well discussed.....guess I should have searched first, so often the case with this forum (well supported, quality posts covering most topics)

Like all things audio, it comes down to application

Thanks again!
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Old 27th September 2006, 01:21 AM   #18
Ken L is offline Ken L  United States
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I believe the different size of the NBd magnets allows the manufacturer more versatility in the design.

In that, certain physical variations are available to him that would not be with ferrite.

Seems like I have seen mention of that on one of the Lowther drivers - so I'm not sure that would follow thru with non-full range designs.
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Old 27th September 2006, 01:53 AM   #19
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Neodymium has the greatest flux decrease with increasing temperature of any magnet material commonly used in speakers, as opposed to, say, alnico, which has the least. This is reflected in the two materials' relative curie temperatures.
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Old 27th September 2006, 01:37 PM   #20
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Default neo, alnico

yeah, and alnico just sounds good...

unlike ferrite chunks.

neodynium I believe is inherently sheilded, (closed magnetic circuit) like alnico as well, I beleive.

for paper cone stuff, alnico just works. good tone. appplication, as said above...

neodyniumm could be tuned too strong perhaps. creating more bends in the process(?)

I do tend to like the sound of neodynium stuff though. in general.

eh who knows.

Clark
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