My DAC (RME ADI-2) runs off a little wall wart power supply. While I was deciding which power station to buy for the rest of my equipment, I decided to buy a 12v Lithium Ion battery pack for the DAC to see if the sound improved.I concur with this experience with mine....
The improvement to the sound is astonishing. Nothing subtle about it.
My NOS dac work with an internal battery run with an external linear power supply that refresh it constantly....Starting point systems french dac.... Best ratio quality/price...