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If I understand the problem correctly, it's probably a stereo thing. Adding to phase-coherent correlated signals makes +6dB, adding non-correlated +3dB. Starting at a certain wavelength, both mics will receive more of the same signal, i.e. the bass signal becomes more similar.
Am I making any sense? Perhaps I should make a sketch.
Edit: (Trying to make more sense) With a low frequency and an A/B setup, we are actually sampling the same wave at two different points. The more similar the pressure level at these points is, the bigger the sum of the two.
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