you can also try to suspend the TT. parang yung wall mounting ng rega turntable. yun wala na hong vibration coming from the floor. total isolation na po sya.
i have an isolation platform na granite then may isolation footer, yung TT ko po naka double isolation pa. meron pa din hong konte. hirap talaga pag suspended flooring. but you can try the suggestion of boss muy, mukhang suspended flooring din ho yung kanyang music room.