Tapping plinth, that’s not the way of testing a turntable’s isolation. You should tap the stand where turntable sits and if you hear feedback from speakers then you have an isolation problem. Tapping plinth is one of the mistakes most people do. Plinth is directly connected to bearing, platter and most importantly tonearm. That’s how a plinth should be, directly connected. The job of isolation is to decouple plinth from the stand and the room.
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