You will hear any sound between 100Hz and 20KHz, some people can hear above 20KHz, but not many - only normally dogs and cats (picture a dog whistle).
Bass sounds are normally between 600Hz down to 200Hz.
Sub Bass is anything under 200 HZ - Anything lower than 50 Hz you will hear, but it sorta feels weird - Gets you in the stomach.
These headsets emulate the sound you would hear/feel if you went to the cinema and watched a film in DTS/Dolby Digital at high volume i.e. you will hear everything, and also feel the loud explosions gun shots etc that are loooooooow bass.
They sound great. Well not actually, as I havn't heard them, but they sound great on paper
If I could get a pair in the UK, I would buy them straight out - No hesitation. I like to hear/feel my music/audio etc, unfortunately, my neighbours DO NOT. In order to feel the music, it has to be loud, these headsets will give you the full music spectrum without 'waking the dead'