Except that's based on dynamic range, and I'm not talking about dynamic range, I'm talking about resolution. I won't argue that you can't hear a whisper next to a jet engine, but with complex music, I don't see how a high noise floor would prevent you from hearing the difference. I mean, to extrapolate on what you're saying, if I raise the noise floor high enough (what is it, -48db?), you're saying you wouldn't be able to tell the difference between 8 bit and 16 bit audio, and I think you would. I agree you wouldn't be able to hear a 1-bit (out of 16) signal with a -48db noise floor ("dynamic range"), but I bet you could still tell the difference between an 8-bit signal and a 16-bit signal ("resolution").