Bartok -- Bio means, changing drivers: from one that has a cheaper ceramic magnet to one with a neodym.
There are drive units with identical mechanical parts -- but different material magnets (Supravox for example).
Alnico and neodymium can offer much higher magntic flux and in a more seamless manner.
The result is audible in operation.
The down-side is, Alnico is very expensive, neodym is expensive -- whereas ceramic is usefully cheap.
There are drive units with identical mechanical parts -- but different material magnets (Supravox for example).
Alnico and neodymium can offer much higher magntic flux and in a more seamless manner.
The result is audible in operation.
The down-side is, Alnico is very expensive, neodym is expensive -- whereas ceramic is usefully cheap.