The Pro-Ject Audio Aluminium Sub platter Upgrade for turntables Available in 3 Variants, please choose the Sub platter that matches your turntable from the drop-down menu when ordering. The Pro-Ject Audio Aluminium Subplatter Upgrade takes your Debut, Classic, X1 & X2 turntables to the next level.The diamond-cut aluminium sub platters are 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 & drive system, resulting in additional damping of noise and unwanted resonances. The improved tolerances during production will increase overall speed accuracy. The additional mass improves short-term speed stability, also called "wow & flutter". Features: 3 variants to match Pro-Ject Debut, Classic, X1 & X2 turntables Precision machined out of aluminium to the lowest tolerances Adds more mass and further damps unwanted resonances Increases speed accuracy and short-term speed stability (Wow & Flutter)