– 7 –O P E R A T I O NXLR Balanced InputCheck output of source unit for proper signal polarity1/4" TRS Balanced InputCheck output of source unit for proper signal polarityPin 1 = GNDPin 2 = (+)Pin 3 = (–)INPUT FROMSOURCETip = (+)Ring = (–)Sleeve = GNDINPUT FROMSOURCEMany popular mixers use unbalanced outputs and can be used with the balanced inputs. To minimize residualground noise, we recommend using twisted pair cable or short cable lengths in this type of configuration.XLR Unbalanced InputConnect (–) and GND (shield) terminals atboth ends of cable toprevent unstable amplifier operation1/4" TRS Unbalanced InputPin 1 = GNDPin 2 = (+)Pin 3 = GNDINPUT FROMSOURCETip = (+)Sleeve = GNDINPUT FROMSOURCE12 3GND–+12 3SHIELD+SHIELDSHIELD+–+INPUT SWITCHThe unbalanced input uses a conventional RCA phone jack.Move the input switch UP to use this jack.The balanced input jack is a dual function connector acceptinga 1/4" Phone (Tip-Ring-Sleeve) or an XLR plug. The 1/4" Phonejack is connected according to conventional usage. The XLR jackis connected according to the IEC and AES standard. Move theinput switch DOWN to use this jack.Unbalanced InputBalanced InputON 1 2 3 4RCAUnbalancedXLR or 1/4”BalancedON 1 2 3 4RCAUnbalancedXLR or 1/4”Balanced