Getting back to the original post, I hate hospital grade wall plugs. Their only purpose is to not spark when cords are unplugged. They are not as conductive and sound terrible. I have bags of them.
On the question of whether wall plugs sound different, I will say try them. If you hear a difference, ignore those who say you cannot. You are not delusional; they are.
On the question of whether wall plugs sound different, I will say try them. If you hear a difference, ignore those who say you cannot. You are not delusional; they are.