Allen&Heath DR128 SERVICE MANUAL - Manual (Page 39)

32 Hardware Configuration
DR128 U SER G UIDE
6        
* &*     
    
    %!        &     
        
  * .  (    5 
& 
Caution
Do not attempt to force the gain trimmers as they can easily be
damaged.
6   
* & * 87! 6   
*
    , 
& &&     
Anti-Clockwise Mid Clockwise
Sensitivity (dBu) +4 -4 -8
Gain (dB) 0 +8 +12