On removing bass, mid frequency emphasis from microphones while recording a vocal part without using an external equalizer

At your risk. This could be on recording a sparkling vocal such as The Power of Love - Frankie Goes to Hollywood. Or pehaps lady lady - Georgio Morroder. A trick explained to me by Lefteris long time ago is to use a parametric EQ, increse dbs above 0, tune it to the voice fundamental or where the vocal sounds worse and then reduce a few dB from 0 until it sounds very nice. This may be mentioned in Wadhams book on recording, if memory is correct. But this post is about recording a nice voice without an EQ or even a Pleiades gentle slope low cut filter etc. The Lou Burroughs (ElectroVoice) trick described in his book microphones is used. 2 microphones, one deliberately out of phase, and singing to one of them. Their distance appart can be used as a parametric canceling EQ. It works on omnidirectional microphones, but will it work on cardiods for example too? Yes!, yesterday 2 shure SM59 (they have flat frequency responce) were tried. A special cable of 2 XLR inputs, 1 output (2 mics tonected therefore in parallel) but one of the female input XLRs is connected deliberatyely mistaken, out of phase. The sum was connected to Sony TC-D% PRO in mono mode used as a preamp. Monitoring in real time by Sennheiser HD-580 headphones. Mics were at about 24in, above head, pointing towards head while singing. If one mic is used we have the usual possibly proximity bass boost effect even at 24in, and the voice effort bass heaviness due to singing softly, (not loud), and the equal loudness bass boost effect from amplifying a voice. Plus room bass mode artifacts. If the second mic (the out of phase one) is connected, added) and the 2 mics are saqy 3 feet apart, some bass is reduced but there is still bass and mid exageration to listeners brain. If the distance of the 2 mics is reduced while singing at 24in on the 1st one, bass heaviness gradualy desapears, and then mid heaviness gradually desapears until at about 12in the vocal sound becomes crispy as on those classic recordings of amazing clear voice. There is no coincidence, 12in correspont to a certain wavelength which is turn corresponts to a certain cutoff frequency. You may experiment with mic to mic distance for a particular setup. It is like having a world class parametric EQ without the need of the equipment, just 2 mics and a special deliberatly wrongly made cable. Later addition, experiment retried. So far best sound is when 1 SM59 is pointing towards singer's head, 2nd SM59 pointing at some other direction, eg towards th piano. It is best to experiment.