About the XLR output :
         For more fun to the user of full balanced system, face to the front plate, the Left side XLR output sockets have the full balanced output , the right side XLR output sockets only have the hot signal output (mean single ended), user can through the XLR cable to experience the different sound flavor between full balanced and single ended.

Auto dark the display:
         While the unit selected input 5 and the volume on 0 step, turn the volume knob lower 1 step, the left second display show "1" mean the auto dark active, the display will dark after you stop operate all buttons .
         If you want disable the function, While the unit selected input 5 and the volume on 0 step, turn the volume knob lower 1 step to let the left second display show 0 .

Display inform:
         Left first mean the input channel number .
         Left second mean the auto dark function.
         Another two display mean the volume level, number higher volume is higher .