Numark PPD 9000 Manuel D'utilisation Du Propriétaire page 9

Sub Bass Level Lock Control: (Sub Bass/Mic 2): Mic 2 ON to activate
Press and the current position of the Sub Bass control will be set as the maximum level. When the
mixer is in operation the user will not be able to increase the sub bass beyond this level. Moving the knob past
this point will have no effect.
Factory Default: Disabled
Recommended Usage: This is particularly useful for ensuring your bass woofers will sound clean and punchy
without clipping if the DJ or other user attempts to push the sub bass further.
STEP 3: Save Settings
When satisfied with the customized settings, power off the unit and power on again.
NOTE: To restore factory defaults, press and hold CH3- and during power up.