You can see a bunch of the tests I did here.
TL;DR, my machine is a tad louder than yours assuming our decibel meters are both accurate. What you’re seeing seems normal for a Nomad.
Unfortunately the noise is a design choice: the Nomad uses stepper drivers that are rather abysmal when it comes to noise. I hear they’re great for reliability and consistency so there’s a reason for it but when it comes to noise, I’ve tested a variety of drivers and I’m yet to find stepper drivers louder than the Allegro A5977 drivers that the Nomad uses.