2 out of phase Shure SM63 microphones on close vocals

Is this a way of creating a mic with brain?


At your risk. Protect your hearing.


This is revisiting the trick described in the Microphones - Lou Burroughs (Electro-Voice) book on deliberately connecting 2 omnidirectional or pressure mics out of phase and singing to one of them for noise canceling and reduction of bass heaviness.


Signal path:


Male voice singing at high register - 2 SM63 connected out of phase in (electrically) series - Sony TC-D5 Pro, in mono mode - Sennheiser HD 580 - listener's (singer's) brain


Mics are connected as:
Pin 2 of mic 1 to pin 2 of preamp, pin 3 of mic 2 to pin 3 of mic 2, pin 2 of mic 2 to pin 3 of preamp.


So total impedance is 400Ω and mics are out of phase.


Then singing at about 1in from the in phase mic.


When mics are at say 2 ft apart the sound is bass heavy and there is ambient low frequency noise.


As mics are approached ambient noise falls dramatically until only a small high frequency hiss can be heard.


A distance of about 2in between mics gave the best sound with no bass heaviness and nice mid and treble detail.


Then the mics where again taken apart about 2 ft and a Pleiades (130Ω,40mH) gentle slope high pass filter was inserted between in phase mic and preamp. The sound was even more bright with less midrange.