We use dynamic mics now, so we don't get as much room noise as we used to. But when we do, I use the Noise Reduction tool in Adobe Audition. Of course, that doesn't help live audio.
Andrew, are you asking about live situations, or in a studio? (As for technicians, I use a bit of Fred, some George and a smidge of Pamela. Sorry, couldn't resist! :-) Don't you just love predictive text! )
Be careful with compression. Compression can increase the noise in a room. If you have a noisy room, watch the gate too, it can add a weird roll off of room noise. Best thing I have found is to lower the gain and get closer to the mic. Also, an end fire mic can help significantly because they have great off axis rejection.
I am referring to a controlled environment (Studio). I am using a Gate on my mic but since upgrading to the Neumann TLM 103 I am hearing some room Reverb. Its very slight and I think I can combat it with some sound proofing material.
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