And that is for all people, all of the time - under any conditions, no matter what the surrounding gear.According to Amir, anything greater than a SINAD—combined total of distortion + signal to noise ratio—of 115db is inaudible. And if you cannot trust the science, then no one can help you.
For the vast majority of people - in real world listening conditions, with typical ambient noise levels etc, then a limit of audibility will be in the 80dB to 100dB range - or even lower.