Thorens TD124 “Mk1”/Mk2 plinth

The model this dealer prefers IS the Mk 1 with the ferrous subplatter.  Most fans of this table prefer the sound with the ferrous subplatter.  If I owned the table, I would go with the Schopper subplatter just for peace of mind alone.

Why (for what reason) does anyone think the ferrous subplatter would sound best? I wonder.

It has a different resonance characteristic.

Maybe. But if it’s the resonance of iron , then why would a nonferrous aftermarket subplatter suffice as a substitute where the mk2 nonferrous sub platter is judged to be inferior?

The after-market Schoppers subplatter IS made of a type of cast iron similar in acoustic properties to the original subplatter.  However, the cast iron is impregnated with a material that greatly decreases magnetic attraction; it was material supposedly invented for use in submarine construction where not attracting magnetic mines was a big help.