Some time ago I had a conversation with someone who was making a video about sewing, and wanted to include the actual audio of the sound of needles passing through cloth!
They had been advised that using a low noise, high quality, highly directional shotgun mic? was the way to go.... They had been advised to look at the Sennheiser range!
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I pointed out that the inverse square law (already described in this thread) made the proximity of the mic to the source the most important factor in determining how successful they were likely to be in getting a useful result - especially when recording such tiny signals.? ?
That of course doesn't automatically mean using an expensive mic!.... I suggested using a Primo EM172 -? located only a few cm. from the source? - might work, and made a short video clip to illustrate the point ...
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If it is an option to locate a small mic slose to the source, then I would suggest that's likely to produce the best 'selective' audio recording results.
Even a highly directional, very low noise mic will? - at a longer distance - almost certainly produce inferior results.??
As Jerry has already commented - you can't 'twist the laws of physics' !
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