Lossy Audio Coding and Subliminals

[Shannon]

I expected that the ultrasonic would be more effective based on the volume difference alone, but even with the consideration of band width and the volume difference, people get just as good results with both formats. I've seen it reported time and again, and seen it for myself, and I don't understand it - but that's what's happening. Theoretically, ultrasonics should be significantly more effective for those reasons. But that is not borne out in actual use and results.