Demagnetization.

 

 Magnetization and

 Re-magnetization.

 

 Replacement of 

 fractured magnets.

 

 Unstuck magnetic

 groups for:

 Repair

 Internal cleaning

 Recentering

 Technical changes

 Galvanic treatment.

 

 Replacement surround

 of foam or butyl

 rubber.

 

 Running speakers in

 climatic chamber -

 Burn-In.