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Old 29th January 2013, 12:56 PM   #1
bebo60 is offline bebo60  Italy
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Default alnico units by JBL

Hi,
I'm talking about JBL... what is the visible difference between an alnico and a not alnico woofer, tweeter?
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Old 29th January 2013, 01:17 PM   #2
tinitus is offline tinitus  Europe
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very often Alnico's are covered with a cup
mostly, if people could see the magnet, they wouldn't buy it
I guess its the reason to cover it with a cup

but if the magnet is visible it will be longer, with smaller diameter
ferrite magnets are flat and wide diameter
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Old 29th January 2013, 02:43 PM   #3
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Most of the Alnico woofers have a cast iron pot structure on the rear. the Alnico ring is a cylinder inside the voice coil and the magnet circuit is finished by the pot. It (the pot)was smaller in diameter and smooth, with a blue grey or black crackle paint finish.

Ferrite magnets have a visible ferrite ring (looks like ceramic or dull gray glass) as the widest diameter element. Most units have it hidden under a rubber tire as it has sharp edges and looks less elegant. Those units also have a die cast back plate rather than a full cup.

I assume you are looking for ferrite versions due to their lower distortion and freedom from high power demagnetization!

David S.
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Old 29th January 2013, 02:48 PM   #4
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by speaker dave View Post
.... the Alnico ring is a cylinder inside the voice coil ....
I thought that would only be used on very small drivers, and older vintage drivers like the ones used in televisons etc
with the magnet inside the voicecoil I reckon they would definately be high Qts drivers
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Old 29th January 2013, 02:50 PM   #5
bebo60 is offline bebo60  Italy
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thaks both for fast replay... so why the alnico units seems to be the most wanted despite higher distortion and they are subjects to demagnetization? I know alnico was used in the vary past when amplifiers had few watts.
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Old 29th January 2013, 02:52 PM   #6
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Why indeed? Just another one of the audiophile myths.

I think some people like the sound of a partially demagnetized speaker, you know, more bass from a D130.

David S.
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Old 29th January 2013, 02:54 PM   #7
tinitus is offline tinitus  Europe
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the older vintage drivers probably sounds much better with alnico magnets because they were designed for that
when they tried to mount the same driver with ferrite it didn't seem to work so well
a few more tricks were needed
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Old 29th January 2013, 02:55 PM   #8
bebo60 is offline bebo60  Italy
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Originally Posted by speaker dave View Post
Why indeed? Just another one of the audiophile myths.

I think some people like the sound of a partially demagnetized speaker, you know, more bass from a D130.

David S.
I had this feeling...
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Old 29th January 2013, 02:59 PM   #9
tinitus is offline tinitus  Europe
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yeah, its for 'enthusiasts' mostly
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Old 29th January 2013, 03:01 PM   #10
bebo60 is offline bebo60  Italy
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Thanks..... on diyaudio I always find the answers...
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