Pro-Ject Audio Systems Pro-Ject Signature 12 - Manual (Page 16)

5. Mounting distance adjustment
Loosen the locking nut allows the linear shifting of the tonearm. Adjust correct distance by using of the scale.
The correct mounting distance 304.8 mm on the scale is valid only if the cartridge is in the correct position on
the headshell.
However there are exist very special and different cartridge types which makes a correct mounting distance
impossible. In this case you can change the distance of the arm easily and allow you to use all available
cartridge types.
Additional this feature allows you to use different alignment tools. There are existing different versions of
alignment tools for setting and optimization of null points. You can get with different settings small sound
variations.