Don Romano (alt)
Bode plots and polar patterns for simulation of 2-element array of omnidirectional microphones, with their outputs subtracted and delayed to create a single cardioid microphone, with a low-shelf filter (+24 dB @ 20 Hz) added to linearise the frequency response.
It looks like you want to keep them really close together to move the comb filter out of the audible range. The drawback of doing this is the need for even more amplification on the low end.
Don Romano (alt)
I wonder if your average cardioid pattern microphone boosts the bass frequencies to get a flat response as much as I'm doing now. A +24 dB low-shelf filter is pretty extreme. That's the same as amplifying the signal 251 times. I could make it less extreme, but that comes at the cost of the low-end response. I should take a look at the low-end response of some professional cardioid mics for reference.
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