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Old 27th October 2019
Lives for gear

That you were able to get stereo imaging from a pair of narrowly spaced (and especially angled as well !) omnis is actually not surprising. Most omnis do become more directional at higher frequencies, which their polar plots will show you...especially above 5kHz

Admittedly you won't be getting ORTF-like stereo separation, and you'd expect the width to be somewhat curtailed....but as you've found, closely spaced omni mics certainly don't produce a mono image !

I maintain that a Rode NT-4 XY mic will give you a small but plausible stereo spot miking width, if the cardioid capsules are replaced by the Rode NT 45-O omni.....which conventional wisdom and theory would say is impossible, as they're effectively coincident ! That might be so for the bass, but not for the upper HF region.