The first thing the output of an LPS into a Chord Qutest would find … is more (internal) switching power supplies. No measurable difference at the output of the DAC. No audible difference either (to me). Even when I’ve tried it with a state of the art lab-supply that cost more than a new BMW.
Same was true of the Hugo TT2.
I’ve heard a DAVE that was modified with a big, external, PSU that cost half as much as the DAC itself and was in an ugly plain box at least twice the size of it. This actually bypasses DAVEs internal main SMPS (though not all the internal ones). Couldn’t tell it apart from a regular DAVE in a synchronized, level matched, back to back comparison. Didn’t measure any different at the output of the DAC either.
Personally, the cases I’ve found where an LPS did make a difference, it was mostly with analog hardware (amplifiers), that didn’t then have their other SMPS or level-shifters internally. That usually required measurements to see … audibility was basically zero unless either nothing was playing, or it was so quiet a passage as to be subject to other noise issues anyway.
Your mileage may vary.