Unfortunately, the one time that the EBS sent the wrong authenticator, it wasn't flapdoodle or chickenhead. Befitting the cinematic creepiness of the system (and the Cold War itself), it was "hatefulness."

http://ebstest.stlmedia.net/

The word that finally ended the fake crisis, an hour later? Impishness.

Additionally, few speakers have a range that goes below 20 hz , as lower tones fall below the range of human hearing.

If you want to test this on your own speakers, here's a 20 hz tone as an mp3 file. It comes across as silent on my Macbook ('tho maybe my hearing is shot from years of subway riding). If the tone was audible, it would certainly be a low bass.

Also, random: Just below the range of hearing, the resonant frequency of the human eye is 18 Hz. The human skull resonates higher in the range, between 500 Hz and 7.5 kHz (ymmv).

I seem to recall that the FCC imposes limits on the range of speaker output, but can't find documents stating the same. Anyone know if that's the case?