The Talking Machine World, p.5, Feb. 15, 1927 Published 2022/09/14 at 528 × 920 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source Brunswick Ad on <a href=httpsworldradiohistorycomArchive Talking Machine20sTalking Machine 1927 02pdf>The Talking Machine World<a> p5 February 15 1927