Off-axis response is more important when recording with mic pair placements such as X-Y, ORTF, MS and Blumlein. This is because the front of the mics are not pointing directly at the source. Off-axis response is less important when the mic placements point the capsules directly at the source.
There are other factors that effect things beyond that, such as the mics' distance from the source, their separation from each other and, of course, room reflections.
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