A new, improved master recording disc is being produced by advanced manufacturing facilities and techniques. The erratic quality heretofore common to lacquer discs has been eliminated. The new, flatter disc surfaces fulfill the ever-increasing demands of stereophonic and fine line cutting. Presented is a description of manufacturing improvements, quality control procedures, and comparative test data against outdated discs.
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https://aes2.org/publications/elibrary-page/?id=1212
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