All things physical that are measurable are not audible.
All things physical that are audible we don't always measure.
Sound and hearing are not the same. Sound is real. Hearing is a combination of sound our ears pick up and our subconscious combined. It is not objective. Not in humans. You may very well hear something and no one can tell you if you do or not, but it does not mean it was physical sound.
It's statements like these that give sane members here pause. Your reliance on an insanity defense (accusation?) is really getting old. It makes one wonder just how familiar you are with it.
All the best,
Nonoise