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CRTs with NTSC rasters emit a slightly audible hum at 15.75Khz. It's at the high end of the range of human hearing. Lots of people can hear it, including me.
I can see things around me with my eyes closed
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CRTs with NTSC rasters emit a slightly audible hum at 15.75Khz. It's at the high end of the range of human hearing. Lots of people can hear it, including me.