soundcraft spirit live 4.pdf - Free Pro Audio Schematics

INPUT10. PAN11. PFL/ PEAK LED12. ON SWITCH13. ROUTING SWITCHES13. CHANNEL FADERThe PAN control determines the position of the signal withinthe stereo mix image or may be used to route the channelsignal to particular output GROUPS as selected by theROUTING SWITCHES (13). Rotation fully anticlockwisefeeds the signal solely to the Left mix buss or Groups 1 and 3,while rotation clockwise sweeps the image to the right buss orGroups 2 and 4.When the PFL switch is pressed, the Pre-Fade signal is fed tothe headphones, where it replaces the selected source. ThePFL/AFL LED on the master section illuminates to warn thatthe headphones and the meters are now responding to thePFL/ AFL selection and the PFL LED on the input channellights to identify the active channel. This is a useful way oflistening to any required input signal without interrupting themain mix, for making adjustments or tracing problems.When the PFL switch is released the LED on the channelserves as a PEAK indicator, to warn when an excessively highsignal level is present in the channel. The signal is sampledat two points in the channel, immediately after the inputamplifier (PRE HI-PASS FILTER & PRE INSERT) and POSTEQ. The Peak LED will illuminate approximately 4dB beforeclipping and therefore give warning of a possible overloadeven if the peaks are removed by external equipment pluggedinto the Insert.The ON switch enables all outputs from the channel whenpressed, and the associated LED illuminates to show that thechannel is active.The input channel signal may be routed to the main STEREOMIX (L-R) or pairs of GROUP busses (1-2, 3-4), by pressingthe respective switches. These may be used in conjunctionwith the PAN control (10 above) to route the channel signalproportionately to any of the selected busses.This long-throw fader determines the proportion of thechannel in the mix and provides a clear visual indication ofchannel level. Normal operating position is at the ‘0’ mark,providing 10dB of gain above that point if required.Pa g e 14