The 320 in all its variations was/is an induced magnet type. If memory serves me, the 400 series (including the 420) were conventional MMs. Probably different from the 300 series in sonic character.
For sure and being IM type one of the main reason. ACUTEX M320 STR III is the best of them all in my system. I bought one 5 years ago as guided by Raul the Seeker, Dave the Messenger and Vic the Magician
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