It is probably cartridge calibration at the factory, the best cartridges are selected for a proper channel balance between L and R. Some cheaper cartridges have imbalance by default and the best way is to have a preamp with separate L and R volume control.
But first check the anti-skating with Test Record.
And set up the azimuth correctly with a shell with azimuth settings.
But first check the anti-skating with Test Record.
And set up the azimuth correctly with a shell with azimuth settings.