woofer pole

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Hi

I would like to know how much of an effect does a symetric magnetic field around the pole piece and the face plate has on the sound quality of a woofer? Actually 2 kinds of pole pieces are available one is a T-pole and the other is a normal cylindrer(both extended 5mm,copper plated,2.5cm central vent ),which to use for better performance? Thanks for any help.

sumit
 
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