I second what @sandthemall said. "Hospital grade" receptacles are built to higher mechanical - not electrical - characteristics. They are designed not to fail from heavy usage, not to break or to release a plug if it is yanked inadvertently.
Hospital grade receptacles are not allowed to have isolated grounds in patient care spaces. https://www.electricallicenserenewal.com/Electrical-Continuing-Education-Courses/NEC-Content.php?sectionID=353.0
Hospital receptacles power equipment that is typically far more sensitive and expensive than a stereo set up, equipment which, should it fail or falter, could have life-threatening consequences.
Spending hundreds or thousands of dollars on an outlet, beyond one that has good solid connections and has sufficient amperage rating, will not provide any improvement, electrical, audible or otherwise. An exception might be for an isolated ground, if that is indeed a problem in your space, i.e., you’re having trouble with ground loops.