Good start.
This is a more or less English version of the readings.
https://forum.audacityteam.org/t/measure-between-23db-and-18db-rms/32770/16
I got your two volume numbers, RMS and Peak to work, but the room noise is MUCH too loud. It sounds like you’re mixing cement in there with you. I can suppress the noise but the fix starts messing with your voice.
Is the computer in there with you? Can you tell if it’s on just by listening? What else could be making fan or motor noises? Air Conditioner? Fan in the window?
I prepared a sample where I made the noise at the beginning worse on purpose so you could hear it.
What could be making that noise?
In audio the maximum loudness is zero (0dB) and everything gets quieter in negative numbers. The numbers aren’t linear, either. When ACX says your background noise (sometimes called Room Tone) needs to be -60dB, they really mean the noise needs to be a thousand times quieter than your voice.
No, that’s not easy. This is where most home recording people fall over. “You mean I have to turn my noisy refrigerator off?”
Ummm. Yes. Or record somewhere else. Can you tell if something is running just by sitting and listening?
Which microphone are you using and how is it connected?
Koz