Two capsules may be combined into a single housing so that one mic can capture both left and right sides of the sound field.
This is much more convenient than setting two mics on a stereo bar, but obviously less flexible.
Some stereo mics use the MS principle where one cardioid capsule (M) captures the full width of the sound stage while the other figure-of-eight capsule (S) captures the side-to-side differences.
The MS output can be processed to give conventional left and right signals.
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