[pier25]

> 100-1000x lower than any transducer

This seems like a lot but it's only 20-30db lower than whatever reference they're using.

This is the spec that really matters: THD+N: 0.0003% which is roughly -110 dB. It's very good and completely inaudible but not exceptional these days.

[Kirby64]

THD+N is irrelevant for the issue the author is describing, through. You need to spec PSRR (power supply rejection ratio). Many individual ICs do not spec this, and pretty much every system does not spec this.

[pier25]

Indeed. I was only commenting on the 100-1000x claim.