Response frequency (Maxfield & Harrison, 1926) Published 2022/09/20 at 1200 × 1092 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source <a href=httpswwwbiodiversitylibraryorgitem57633page513mode1up>Methods of High Quality Recording and Reproducing of Music and Speech Based on Telephone Research<a> by JP Maxfield and HC Harrison Bell System Technical Journal Vol5 p493 523 1926