Installation, Positioning the amplifier rack mounting, Mic1 mic2 mic3 on off on off on off on off mic4 – Staub Electronics ECA-70MIXAMP-1-120 - EPISODE - 120 WATT RACK MOUNTABLE 70 VOLT COMMERCIAL AMPLIFIER-MIXER User Manual
Page 8: Xlr bal 1-gnd 2-hot+ 3-cold