While ISO-Stealth® takes care of the lower frequencies, SonicFLO takes care of the higher ones. As we all know, the drivers in In-Ear Monitors pump out sound through tubes. These tubes carry that energy into your eardrums.
However, if you pump that energy through your average circular tubes, you do not get to hear the higher harmonics due to the principles of resonance and cancellation.
The idea behind SonicFLO Acoustics® is to use asymmetrical tubes, while harder to manufacture, to pump air or sound through. Because of the lack of reflection, the higher harmonics do not get muddled out and disappear, so you will get to hear everything that your music, films or games have to offer, in crystal clear qualities.