The grateful dead figured it out in the 60s. Noise cancelling. Wire up 2 mics, with the wires reversed on one, set them in the same axis, paralell, but an inch

The grateful dead figured it out in the 60s. Noise cancelling. Wire up 2 mics, with the wires reversed on one, set them in the same axis, paralell, but an inch or 2 apart, talk into only one of them.