When I installed a pair of 20 amp lines I went with the Arrow-Hart hospital grade outlet. Frankly, I didn't expect a change in sound and in my subjective opinion I didn't get one. What I do like though is the greater tension applied to the plugs. When using a stiff power cord I've experienced some tendency for the cord to pull the plug partially out of the socket. The greater tension offered by the hospital grade outlet helps keep the plug fully seated.
