An attempt to remove excess mid high frequency content from SM58

At your risk. Trying to figure out how the beautiful vocal sound of Lady Lady - Morroder may be made. Mic distance used on this experiment is 24in, 30 degrees towards nose above head. A Pleiades inline low cut filter of 155mH was connected to mic. Then to reduce mids a filter like the one inside SM7 was made with 11mH, 220uF in serries and the total connected again across source. In fact mic initialy was not connected, the line out of Sony CD walkman was connected having an output impedance of 300Ohms on a vocal recording that was not good, too mid heavy. Then the Pleiades 2n3053 power amp was driving the Celestion Ditton 150 speaker. The filter worked and by using a capacitor box 100nF was found to sound more proffesional than 220nF on this particular male vocal case. If wa calculates the resonance frequency by equating the inductor reactance to capacitor reactance ie wL=1/wC, where w(omega) is angular frequency or velocity of the rotating vector that produces a sinewave on its projection to the sin axis of a trigonometric circle, w=2 times PI=3.14 times frequency. A trigonomatric circle is defined a circle with radius 1. For C=220nf we get rougghly 3.5KHz, for C=100nF we get roughly 5KHz which seems consistent with the inherent peak of SM58 that i wish to reduce in hope that the higher frequencies would shine even better. A resistor in series might be needed too to adjust the notch filter bandwidth. Initial listening tests with SM58 at very low volume are promising. Low volume with just 2 JFets driving the HD580 headphones (Pleiades 2 K117) pre amplifier directly driven from mic trough a Canford inline input transformer. All filters connected just after mic, before the input transformer.