Eliminating background fan hum and room ambient noise from microphone recordings in OBS Studio is accomplished by applying built-in DSP audio filters.

OBS Audio Filter Configuration Steps

1. In OBS Studio Audio Mixer, click the gear icon next to your microphone and select Filters. 2. Click + and add Noise Suppression. Select method RNNoise (higher quality, more CPU usage). 3. Add a Noise Gate filter to mute audio input when not speaking below -32 dB.