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Speaker magnets

Three questions:
1) The coil in a speaker when fed with current from the amplifier will produce its own magnetic field, presumably 4 layer coils more so. Over time does this ever have any effect on the characteristics of the speaker magnet?
2) Modern speakers have massive magnets compared with most vintage speakers. What advantage do they give a modern speaker over a vintage speaker?
3) Does the magnet in a speaker deteriorate to any noticeable amount just due to age?
chris_w_uk
ditusa's avatar
ditusa
2,453 posts
 
JBL still uses Alnico 5DG magnets in their top of the line speakers. See the link below.

http://www.audioheritage.org/vbulletin/showthread.php?33557-1501al-2


rixthetrick's avatar
rixthetrick
1,060 posts
 
I am led to believe that Tekton utilise this type of magnet in their TOTL Moab speakers....
I wonder what led you to believe that?
Tarot cards, ouija board, industrial strength recreational pharmaceuticals, recent alien abduction?

fiesta75
1,543 posts
 
Tekton does not use Alnico magnets in any of their speakers.
clwinbe's avatar
clwinbe
39 posts
 
While most big woofers have large motor structures, it’s not the sole determination on quality and output. The 8” woofers used in the KEF 104/2 look like anything but impressive, yet their low end is output and power handling is remarkable. It’s the same with Hafler 300 speakers with two 6.5” woofers. Out of the cabinet, their not impressive yet they manage to pump out a tremendous low end quality and volume. 
danvignau's avatar
danvignau
935 posts
 
Did you folks know that a big sub magnet, juduciously placed,  will trigger a hotel safe to unlock it. 
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