Sennheiser MKE600 for me, connected to an H4N external recorder, recording in WAV at the highest available quality setting. I think the gain is set to 30, but that will depend on your room. I have an arm hanging from the ceiling that is set right in front of my face, aimed at my chest, as close to me as possible but so it's not visible on camera. I've tried many other setups, this gives me the purest sound.
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