Sennheiser MD441 U3 with Pleiades air toroid (R,L) high pass filter

The (111Ω,13.7mH) winding connected in parallel with the great mic worked even better than with the higher R,L winding.


The sound is bright and natural without bass, mid, (Proximity effect, Fletcher Munson, voice effort) heaviness.


The Pleiades (130Ω,40mH) inline XLR filter sounds mid heavy and strange with this microphone.


Signal path:


Male voice singing (The Power of Love - FGTH) - Sennheiser MD441 U3 at 1 foot - Pleiades air ring shape coil (111Ω,13.7mH) - Sony TC-D5 Pro - singers ears, brain


Using both windings as a 1:3 step up pre transformer and then feeding Sony TC-D5 Pro created a bass deficient sound, too treble heavy. More investigation needed.