The Talking Machine World, p.3, Sep. 15, 1925 Published 2022/09/14 at 626 × 1200 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source <a href=httpsworldradiohistorycomArchive Talking Machine20sTalking Machine 1925 09pdf>The Talking Machine World<a> p3 September 15 1925