I don’t know what to make out of it, that just under 20kHz peak obviously coincides with the noise or whatever line on SA, and disappears where music stops and audience cheering starts, as if it was separately processed, though I can't hear any transition.
Okay, the sample is
here (9.81 MB WAV, can post FLAC if preferred), and the spectrum zoomed is below, the shaded 2 sec area is right where the sample starts.
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