That's usually caused by the expulsion of vast quantities of hot air ;-)
I once hooked an audio spectrum analyzer to an FM radio. You could almost
always see 15734 Hz and/or 15625 Hz tones in all the songs that they played.
There were quite a few songs that obviously had parts recorded in the US and
others in Europe. Not a good idea to put TV monitors in a recording studio
booth. Maybe things have improved since the advent of LCD monitors...
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when the guy at the station talks, there are strong components below 100Hz
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