Gain staging, a noise floor you can measure and a room that does not ring - the three things that decide whether a USB mic sounds like a studio or a bathroom.
Set the **input gain so peaks hit about -12 dBFS**, put the mic **15 to 20 cm** away with a pop filter, and record in a room with soft surfaces. Cut the noise floor afterwards, never by boosting the gain.
Open **Settings > System > Sound > Input**, select the microphone and set the format to **24 bit, 48000 Hz** if the device offers it. Windows then stops resampling behind the recorder's back.
Settings > System > Sound > Input > FormatTalk at your normal recording volume and watch the meter. Turn the gain knob until the loudest syllables peak around **-12 dBFS** - loud enough to stay above the noise, quiet enough not to clip.
Target peak: -12 dBFS
Noise floor: below -60 dBFSRecord ten seconds of silence and look at the waveform. A noise floor around -60 dBFS is fine; anything above -45 dBFS is a fan, a fridge or a graphics card.
Hang a duvet behind the mic or speak into a wardrobe. A cardioid mic rejects what is behind it, so a soft surface behind the speaker changes more than any equaliser.
In Audacity apply **Noise Reduction** with 6 to 10 dB, then a high-pass filter at 80 Hz to remove rumble, then **Normalise** to -1 dB. In that order, and never more reduction than the file needs.
Noise Reduction: 6 dB, sensitivity 6
High-pass: 80 Hz, 12 dB/oct
Normalise: -1 dBKeep a one-minute reference recording of your normal voice. When a new recording sounds off, compare against it instead of guessing whether the mic or the room changed.
A ground loop or a dimmer on the same circuit. Move the mic to another USB port on the board and turn off the lamp.
Windows input level is below 100, or the mic has a hardware pad switch. Fix both before adding amplification in software.
The mic is too close or off-axis. Add a pop filter and speak slightly past the capsule, not straight into it.
Too much reduction. Stay at 6 dB, re-record with a lower noise floor, and cut the rest with a gate.
Not for a USB mic. An interface is worth it when you want XLR mics, monitoring and a physical gain knob.
48 kHz for anything that ends up in video. 44.1 kHz is fine for pure audio.
Set the Windows input level and format back, and remove the effects chain from the editor. No system files were changed.
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