I understand your curiousity.
I can bang a 10Hz tone into my speakers and it will drive the bass panels bats in terms of excursion.
I can definitely hear it.
Also I have had an ML Descent sub. Could hear it on that too.
That said, both make non-10Hz noises when you do it. You could hear the rubber surrounds of the drive units in the Descent making noises due to large excursion. Like a rubbing noise.
I accept I could be wrong and have questioned it myself. I came to the conclusion I can hear 10Hz.
I will try 10Hz into the Sony's tonight.