Generally the ripple is audible on USB-powered audio devices that don't use isolated 5v rails. The ones that don't have audible issues either have their own VR

Generally the ripple is audible on USB-powered audio devices that don't use isolated 5v rails. The ones that don't have audible issues either have their own VRMs on the boards or they have a sufficiently isolated 5v rail but still use PSU power. A good board should not have issues even under extreme cases. Neither solution is particularly more expensive than the other. If I need to maintain voltage without droop under high load, I probably should be looking at legitimate chargers, not something powered off the computer.