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 HAECO-CSG or "Holzer Audio Engineering-Compatible Stereo Generator" system was an analog electronic device and method developed by Herman Holzer, Chief Engineer at A&M Records in Hollywood. His company, Holzer Audio Engineering in Los Angeles in the 1960's developed the system during the years of transition from monaural to stereophonic popular music recording.