There are two possible causes.

1. Is [MASTER LEVEL] set to the proper position? Adjust [MASTER LEVEL] so that the master level indicator lights up to the orange indicator at the peak level.

2. Is [TRIM] set to the proper position? Adjust [TRIM] so that the channel level indicator lights up to the orange indicator at the peak level.

If the sound is distorted even after the input/output level has been adjusted, the level may exceed the power amplifier's maximum allowable input level. Turn the level down to an appropriate level using [MASTER ATT] on the rear panel. The level can be set to 50% at -6 dB, 70% at -3 dB. This setting does not affect the master level indicator.

When using Serato DJ

Are Track Gain Adjust and Master Output Level Adjust on the Serato DJ software turned fully down?

Adjust them to an appropriate position.