How can I tell if a sub's maget got weak from excessive heat?

[Wingman0121 10+ year member]

Is there a measuring equipment or something so I can tell if a sub's magnet got weak? Maybe physical clues on the magnet itself?

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[sundownz Pro Seller]

Measure T/S specs and check BL -- WooferTest can do that.

 

[hispls 5,000+ posts]

Your magnet has not degraded from heat unless your car caught on fire and burned to the ground.

http://www.rare-earth-magnets.com/Permanent-Magnet-Selection-and-Design-Handbook.pdf

Ceramic magnets have an operating temp of 400 degrees C. If you're running your sub that hot you probably have more problems than magnet degradation.

 

[Wingman0121 10+ year member]

haha awesome, I suppose the cone will burst into flames and coils will unwound way before that, I was just curious...

Now neo magnets are much more prone to BL loss isn't it?

 

[SPLaudio 5,000+ posts]

neo that is a big prob but ceramic looses bl if you have heated it up to say 500f. it will still be magnitised but weaker...