I think you just nailed why judging audio quality is so difficult. You can compare video frame by frame, or look at a still image for as long as you need to, bu

I think you just nailed why judging audio quality is so difficult. You can compare video frame by frame, or look at a still image for as long as you need to, but audio is always disappearing into the past as you listen to it, and the closest you'll get to freezing a moment in time is an annoying buzzing sound.