You can go and hear it, and then it would already be a few weeks in the past that the speech you were wondering about was produced, you would still be processin

You can go and hear it, and then it would already be a few weeks in the past that the speech you were wondering about was produced, you would still be processing it through your imperfect ears, etc. The fidelity is neither perfect; it's a matter of degree, though quite extreme. You have chosen merely to draw the threshold for calling it knowledge at one point rather than another