Beyer M119 to Pleiades (130Ω,40mH) to Gardeners MU 7514

Signal path:


male singing voice - Beyer M119 at 2-8 in - Pleiades (130Ω,40mH) - Gardners MU 7514 1:2 transformer - Sony TC-D5 Pro - Sennheiser HD580 - listener's (singer's ) brain


Without the Pleiades gentle slope low cut filter sound is bass, mid heavy. If the particular (R,L) resistance inductance values filter is connected at the 800Ω side sound is very treble heavy. So it is left connected at the 200Ω side.


Without the Gardners transormer which steps up 600Ω to 2400Ω therefore 200Ω to 800Ω sound is with less volume, some bass heaviness and some treble heaviness.


When the Gardners is inserted in the signal path it acts as a magnifying glass. Sony is much better modulated. For example the rec level potentiometer can be at 7/10 instead of 10/10 for same VU meter modulation. So less hiss.


Amazing quality transformer.


The slight reduction of very low bass or very high treble frequencies make for a flatter frequency response from producer's brain to listener's brain. For an explanation the reader is referred to either [Lowe, Morgan] or [Hilliard].


References:


Sound picture recording and reproducing characteristics - D. P. Lowe, K. F. Morgan - Journal of the society of motion picture engineers


A brief history of early motion picture sound recording and reproducing practices - John K. Hilliard - JAES vol 33 no 4 apr 1985 page 276