The Talking Machine World, August 1927 Published 2022/09/15 at 1200 × 905 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source <a href=httpsworldradiohistorycomhd2IDX BusinessMusicArchive Talking Machine IDXIDX20sTalking Machine 1928 07 OCR Page 0180pdf>The Talking Machine World<a> July 1928