Hmmm mic factors largely. Need super/hyper cardioid pickup ideally... Lots of non reflective insulation directly opposite in the cardioid pattern. Off to sides won't be picked up.
BUT
Down side - cardioid mics add bass at close proximity. Not good for nearfield.
Large diaphram = more artifical bass.
Small diaphram = less artificial bass but commonly cardioid pattern so nearfield get woofy.
BEST for job in 1mtr cubed insulated enclosure... ribbon mic. Coles 4038 / Royer Labs R-121
Downside = Expensive and VERY fragile. BLOW on ribbon wrong way and death.
Look to condensers, small diaphram. Hypercardioid. Recommend borrowing large diaphram condenser - spectral analysis... find the critical frequency range... depending on high and lo cutoff, can then check suitability of small diaphram. Spectral analysis of live source vs recorded should be done. Ensure what's getting recorded is what's getting heard. Quality of AD Converters becomes crucial... MOTU or better.
Budget db measurement these days is down to 40dBA... calibration hopeless. Proper calibration ££s. Ignore dBA unless comparative known baseline specified. Generate testtone using soundforge or similar at fixed dba as reference point (prob already suggested somewhere - skimmed thru)
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