I hope I'm using the term correctly... I think the overtone series is what one hears based on a fundamental. For example, if a C3 is played as the fundamental, the first overtone would be the octave above that, followed by the fifth above that, etc.
My question is, is it possible for humans to hear overtones from a fundamental that is below human hearing? If the lowest tone a human can hear is at about 12Hz under ideal conditions, can a fundamental tone vibrate, for example, at 8Hz (which, in theory, we cannot hear) and produce overtones at 16Hz, 24Hz, 32Hz, etcetera that would be audible to the human ear? (Then, if that is possible, I wonder how much of what we hear falls into that category.)
Not sure why but I've been curious about this for a while and have not been able to find a good answer.