At your own risk.
Both mics can be literally connected in series and one mic is connected out of phase.
We sing to one of the mics and the distance of the other is varied.
It worked great on the following setup using the omnis MD21 HL. It may be possible with directional mics and by connecting to an adding (mixing) desk. On the omni mics although there is no proximity effect the bass was reduced to restore flat frequency responce from vocal chords of singer to brain of listener.
(The live output of one mic was connected to the live of the other, (for phase difference) the 2 remaining pins were the output of the combined mic and were connected to the live, return input of an XLR).
Setup:
+MD21 in series with (-MD21) - Canford input transformer - Pleiades V4, 3.4volt - Realistic Disco Mixer mic mono input - Sennheiser HD580
When two mics were connected in phase it is also very interesting as now the combination appears as a mic quite a few times as strong and noise quiet compared to a single mic and the impedance becomes 400Ω!
There must be comb filtering at play too and it can be used constructively to get the desired sound by varying the distance of the far from source mic.
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