Could you clarify why a plinth is needed for a non suspension turntable to sound at it's best? I've always thought that a plinth, no matter the material will lead to some coloration. Enclosureless loudspeakers tend to sound less colored than the box type speakers.
Unless you've figured out how to get your table to float in mid-air you've got to set it down on something. A heavy inert platform - a plinth - will help reduce vibration and allow you to hear the record and the needle, not ambient vibrations.
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