
5
1   RIBBON LEvEL – Four-position switch used 
to adjust the high frequency response (in 2dB 
increments). 
2   vOLuME - Controls the amount of output level.
3   XLR INPuT - Balanced,  +4dBu line level input is 
connected here via standard XLR (microphone) 
cable.
Rubicon R8a LayoutRear Panel Layout - R8a
4   POWER SWITcH – Main power switch. 
5   Ac INLET  - Connect the supplied IEC power 
cable here.
6    1/4-INcH PHONE – Balance TRS (Tip, Ring,  
Sleeve) 1/4-inch phone plug used to connect 
balanced or unbalanced +4dBu line level signals.
7   RcA – Used to connect signals from unbalanced, 
–10dBV devices.