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Old 10th August 2013, 11:27 AM   #1
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Default Magnet recognition

How can i find what kind of magnet is used in a specific speaker?
Is there a proper way of measuring if a magnet is ceramic, samarium/cobalt or
neodymium?
And again if that is determined, how can i find it's strength (N42-N45 etc etc)
Can anyone shed some light into this topic?
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Old 12th August 2013, 06:13 AM   #2
oshifis is offline oshifis  Hungary
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Ceramic is dark grey and usually the outer diameter is larger than its height. Neodymium is shiny and slim... I've never seen a SmCo magnet, but you can read about it here:

Types of Speaker Magnets | eHow
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Old 12th August 2013, 07:47 AM   #3
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Samarium Cobalt https://en.wikipedia.org/wiki/Samari...3cobalt_magnet

They look like regular ceramic but with a slightly different tone. Neo's are either plated chrome/gold or epoxy dipped due to the materials reactive index. AlNiCo's are bright metallic like stainless steel.
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Old 12th August 2013, 07:53 AM   #4
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Other than wiki references you can look here,

SuperMagnetMan

APPLIED MAGNETS-Neodymium Magnets-Rare Earth Magnets-Ceramic Magnets-Industrial Magnets-Magnets Wholesale To The Public
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Old 12th August 2013, 08:43 AM   #5
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Thanks guys.
I'll look into all these to see what i can find.
They look dark without any coating.They are long (4"x 1/4"x almost 1/2") and a bit chipped around the edges without any obvious oxidation.
I've seen and used neodymium with epoxy and they are smoother on surface than these.
Ceramic ... i don't know...i don't think that Infinity would use ceramic on their
"High Energy" L-EMIM (Epsilon version).
It is either poly-coated neodymium or (best bet) samarium-cobalt.
Anyone having "inside" information?
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Old 13th August 2013, 11:07 AM   #6
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I would be surprised if you find any samarium-Cobalt as large as 4"x1/4"x1/2".
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Old 13th August 2013, 11:17 AM   #7
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To find the exact dimensions is a jackpot.
Of course the length can be made with several smaller magnets but the width and depth should be the same...which again is not an easy thing...
But anything can be made to order...
I have made before made to order neodymium ring magnets (10pcs) for a levitated turntable spindle and the cost was very acceptable...as long as you order directly to the factory.
Perhaps i should buy a second hand Gauss meter to measure the intensity of magnetism
to give the factory a better approximation of what i want...or send them one side of the planar to measure on their own.
We'll see...
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Old 13th August 2013, 05:02 PM   #8
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What are you trying to accomplish??
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Old 13th August 2013, 06:25 PM   #9
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Replace a broken magnet in an Infinity Epsilon L-EMIM.
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Old 13th August 2013, 06:59 PM   #10
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Ah ha!

Broken how? cracked?

Pictures??
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