The Pleiades (130ohm,20mH) bass, mid correcting microphone shelving filter is gentle slope

At your risk. Frequency response measurment with a driving signal generator impedance of 190ohms, referenced to 10KHz: -3dB at 2KHz, -8dB at 300Hz then shelving to flat. So there is also a very gentle boost at 10KHz. The low and mid cut is gentle too due to the 2 time constants. So in order to further improve it and making it closer to a say prefared sewtting of the Cineme Eng. 4031-B equalizer of -12dB at 100Hz and +4dB at 10KHz, series resistance was decreased until -12dB was achived at 100Hz. Using Danbridge decade inductor and resistance boxes the new values found are (54ohms,25mH). A new inductor of 25mH was wound on a small Siemens Epcos toroid that can fit inside an XLR to XLR Neutrik Module tube adaptor. So it would be nice to add 27ohms resistors in series with said inductor on either side and connecting the total to pins 2,3 of input XLR and connecting cables from pin 2 to pin 2 and from pin 3 to pin 3 from input XLR to output XLR. Would this create a portable, no insirtion loss fantastically sounding microphone filter? A plug in microphone filter able to give flat frequency response from record producer's brain to listene's brain. Something that sounds at least as good in frequency response as Something Stupid - Sinatra? Usefdul reference: A brief History of Early Motion Picture Recording and Reproducing Practices - John K. Hilliard