@thespeakerdude Actually it is physiology not biology. Either way, I'm not disputing your chart.
I'm disputing the claim that low levels will "never sound right" (good/enjoyable?) until you get to 100dB.
Sounding "right" is subjective and I spent a lot of money getting my system to sound "right" to me, with documented hearing loss, at 85dB or less, in a relatively large room.