Bill was Director of the Acoustic Laboratory from 1958 or so through 1983. He was also an employee there from the late 40's, and worked for John K. Hilliard and Alex Badmaeiff. Brilliant, yet humble guy.
He said they routinely tested the diaphragms and would have noticed any measurable changes.
I don't care what the Audio Asylum (aptly named) folks say - Alnico V magnets used in speakers DO lose magnetism over time. This is measurable and can be easily demonstrated.
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