Hello,
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Your message sounds a bit like a contradiction to me. The best lows you will get from an omnidirectional capsule are often way lower than what we hear. On the upper range, most go into ultrasonics. This topic is a recent treat.
If you want a more directional response you will have to sacrifice the lows. Pressure gradient microphones have a roll-off in their lows. Can you be more precise in your question?
