Speaker magnet backing plates?

[Barry]

Can anyone describe what type of steel is used for backing ring
magnets in audio speakers? I understand it has special properties but
am not sure exactly what these are or how they are obtained. What is
the fabrication process? Can it be purchased in uncut sheets?

Barry Rogers

 

[Phil Allison]

"Barry"

Can anyone describe what type of steel is used for backing ring
magnets in audio speakers?

** It is ordinary mild steel.

I understand it has special properties but
am not sure exactly what these are or how they are obtained.

** Mild steel has the best properties for creating a strong magnetic field
in a gap - provided it is fully saturated by the energising magnet.



...... Phil