I define "dynamics"... as the volume difference between loudest and softest...
If you take it scientificly.
For me there is even a more subjective "dynamic" which consists of a mix of several sound parameters:
- Tight and deep bass.
- Clean and open attacks and transient response.
- Transparent midrange, even at low and high levels.
- Overall more defined sound.
These are the ones that I found linked to PSU differences in general.
I cannot link those to technical parameters like more or less distortion or such.
It's purely subjecive and often not possible to do A/B comparison, as it's not a 1 second job to reverse the changes.
E.g. I had a big AMEK mixer that's sound drastically changed after replacing the provisional power line cabling to proper dimensions.
This does not mean it worked with undervoltage before!
OK, this thing draws almost 2KW from the power line, a bit more then a tube mic.
I found similar sound changes when comparing power amps PSU's, e.g. a BGW where I replaced the M-core transformer with a toroid.
There are simple technical explainations for this - more stability in the PSU lead to more stable signal processing in the audio chain.
I did not yet find the same thing with mic's.
I can't even "see" the audio on the supply line of a mic using a scope, but who knows.
I was astonished lately what a (my) human ear can differentiate.
I had to check two "in the box"- mixes of a song for equality.
The null-test (difference mix1 - mix2) showed a difference of -80dB below peak level.
The residiual signal sounded like noise with no musical content.
I auditioned both mixes from my DAW, switching blind between two tracks.
Each time I opened my eyes I had choosen the same mix for better sound, no exception!
I did that 10 times to be sure, because I couldn't belive it.
It was he same mix, the only difference might have been either the software version it was bounced from or the dithering used to go to 24(!) bit.
Regards
Kai