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Haeco-csg



The HAECO-CSG or Holzer Audio Engineering-Compatible Stereo Groove system was an analog electronic device and method developed by Holzer Audio Engineering in Los Angeles in the 1960's during the years of transition from monaural to stereophonic popular music recording. The lead vocals and instruments in a stereophonic mix would often sound too loud to the mix engineers when they heard them playing back on monaural AM radio stations and when played on monaural record players, because when the left and right channels were added together, the lead vocals or instruments, equal in level on both channels, would add up to be 3 decibels louder than any instruments in just the left or right channels alone.



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