Hmmm. Sounds dodgy to me.
Note the speakers in the clip - Roland MA-8 monitors. Manual is here for download [
media.rolandus.com]
Frequency range 80 Hz - 18 kHz.
What's more, the human ear can hear sounds from 20 Hz upwards, albeit that lower frequency sounds can be heard if they have enough volume - an impossibility for small speakers (such as those on even top end hi-fis).
The human voice is normally taken to produce a range from 30 Hz and upwards, although it is possible to hit lower notes.
The physics is simple. The wavelength of a 30 Hz wave is around 11 m, whereas the wavelength of 0.393 Hz sound is 870 m.
It's possible, I guess, for a human to produce ultra low frequency sounds, but you wouldn't hear them and speakers wouldn't reproduce them.