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I think its a matter of personal preference - mine being roughly shoulder-width apart. Since you're experimenting with spaced omni's, be sure to look into the Jecklin Disk technique.
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Oktava MK012 have a reputation for being not as quiet as most similar microphones. Both the electrical self-noise and the mechanical handling noise are weak spots in the Oktava's reputation. If I had to choose, I would think that the AT4022 would very likely be quieter than the Oktava MK012. I own a pair of Oktava MK012 and I would think twice about using ...
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Your only solution within budget is to have hand-held mic(s), passed to each speaker in turn. Optimally each mic has a handler to do the physical moves. (You could squeeze that into budget by bringing in a couple of junior employees rather than specialists.)
Your ideal solution would be to have two boom operators. Each of these guys would charge you your ...
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No direct experience with the Oktavas, but the 4022s are really good mics and have a great reputation with nature sound recordists. There is also evidence of them testing quieter than the spec from Audio Technica here:
https://pantherfile.uwm.edu/type/www/audio-reports/MicSpecCharts/Mics_16dBA.htm
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I like my AT4022s a lot and I prefer them to the Oktavas (which I've used a few times). Folks who own the Oktavas tend to enthuse about them, but I like many of the AT 40 series of microphones.
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You can't expect that the Naiant microphones can perform as well as microphones that cost 10x to 50x more $$$. You can expect that the Naiant microphones will have somewhat more self-noise, perhaps higher distortion and a frequency response not quite as wide or flat.
Will you actually HEAR these differences in the final mix? It depends on what you are ...
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