Speakon outputs-4-channel modelsFour-channel amplifiers Additional connectors are provided for channel 3 and channel 4. Channel 3functions as channel 1 above, and channel 4 as channel 2 above.Rear panel features introductionBALANCED INPUT CONNECTIONS The XLR input connectors are electronically balanced,and wired according to the IEC 268 standard ( pin 2=hot ). XLR input connectors should be wired follows:Audio input-4-channel modelsPin 1 Ground/ShieldPin 2 Hot (+)Pin 3 Cold (-)When linking the same source signal to several input channels, be aware that thereis a limit to the number of channels an output source can "drive". A typical outputsourse (e.g. a DSP crossover unit) can drive up to four amplifier channels beforeexternal line-drivers might be required to buffer the signal.To connect an input to an unbalanced source, it ispossible to connect pins 1 and 3 in the XLR plug at theamplifier end of the cable. However, a better methodis to connect pin 3 to the shield at the source end of thecable, as this usually results in better hum and noiserejection. Balanced input connections are recommendedwhenever possibleUnbalanced Input connections5SANWAY AUDIO http://www.china-sanway.com