Not sure what that means Kos?
I hear the noise too, but I had to crank up the volume on my speaker system to do it. In my opinion that doesn't count. If you dig enough, you can
always find something wrong. But the object is not to dig. The object is to produce a saleable work that passes the standards of ACX and you can do that now. I think you should let them tell you there's something wrong.
viewtopic.php?f=64&t=100504
This is one of the less attractive parts of production. The juggling act of production complexity and effort versus just getting the work out the door. Who is going to listen to your book in a studio? My guess is 0.0 people. Most of us are going to enjoy the work on portable music devices while running, walking or doing something else in noisy environments. Or worse, driving.
So my interest going forward is trying to figure out where the noise is coming from—separate from producing a book. As you say, there should be no noise at all and first tests are puzzling. I don't remember if I mentioned my own Mystery Noise, a hum that just would not quit which turned out to be a bass speaker cabinet with a defective power supply. That had me going for over a year.
Start a recording and lift the microphone up from the desk. Did the hum change? Nobody ever thinks about junk coming up from the floor, desk or table. Is the microphone cable tight? There is such a thing as vibration noise coming up the cable. The cable should always be a little loose or have a "drip loop" in it.
Desperation method has you starting a recording and then piling towels or other heavy cloth around the microphone. Did the noise change? It's possible (but not likely) that it's not sound noise, that your electrical setup is doing something wrong.
I followed a internationally respected engineer around the TV station once while he was doing a survey. What impressed me was he was doing everything I would be doing but he didn't make any assumptions or skip any steps. That and he loved talking about what he was doing (I think everybody else was afraid of him). That was worth several college courses right there.
Koz
This forum is for Audacity on macOS 10.4 and later.