Just checked, Curie temperatures are very real but way above what any speaker magnet can reach in normal (even heavy duty) use.
Values in Kelvin degrees, substract 273 for Centigrade.
Those still thinking Fahrenheit: it´s the 21st Century guys
So weakest would be Neo at 310C ... still above speaker disintegration temperature.
They start to loose flux before the curie, not sure at what point. Don't think JBL would worry about it if it wasn't a problem.
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The Grade....always the Grade
from Wikipédia (now forbiden in Turquia & North Corea)
Grades[edit]
Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets and range from N35 up to N52. Letters following the grade indicate maximum operating temperatures (often the Curie temperature), which range from M (up to 100 °C) to EH (200 °C).[15]
Grades of Neodymium magnets:[further explanation needed][16][unreliable source?]
from Wikipédia (now forbiden in Turquia & North Corea)
Grades[edit]
Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets and range from N35 up to N52. Letters following the grade indicate maximum operating temperatures (often the Curie temperature), which range from M (up to 100 °C) to EH (200 °C).[15]
Grades of Neodymium magnets:[further explanation needed][16][unreliable source?]
- N35-N52
- N33M-N48M
- N30H-N45H
- N30SH-N42SH
- N30UH-N35UH
- N28EH-N35EH
Here's what I get from the literature. The curie temperature is where the magnet permanently loses its magnatism. It's no longer a magnet. The max operating temp. Is where the magnet starts to loose its magnatism, it becomes a weaker magnet permanently. Between room temp and max operating temp. the magnet strength weakens with temp. increase but regains it strength when cooled. From this I get: at high power levels the driver magnet will get hot and loose some field strength reducing the acoustic power output causing compression.
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