Pro-Ject Audio Aluminium Sub-platter UpgradeThe Debut Aluminium Sub platter upgrade takes your turntable to the next level. The diamond cut aluminium sub platter is machined to ultra low tolerances and will be a substantial upgrade to the regular sub platters that is already on your turntable. It adds more mass to the entire platter and drive system, resulting in additional damping of noise and unwanted resonances. The improved tolerances during production will increase overall speed accuracy.