Ok thanks for clarifying. I was thinking of a feature on a motherboard I recently purchased:

"USB DAC-UP provides clean, noise-free power delivery to your Digital-to-Analog Converter. DACs can be sensitive to fluctuations in power from the other USB ports, which is why USB DAC-UP takes advantage of an isolated power source that minimizes potential fluctuations and ensures the best audio experience possible."

I've also had to use a 5v step up converter to provide a filtered power source for the camera on my FPV drone I built. I can see why an Audiophile would want filtered voltage supply if they had money to burn I guess.