Human ears aren't the issue. Human ears are a relatively easy things to model. But our ears aren't how we hear. We hear with our brains, and the brain is entirely manipulatable. Deaf people can experience sounds, just as blind people can experience sight. Limbs that aren't there can be felt.
Only an ignoramus would worry about tiny fractions of THD when it comes to an inherently fuzzy and subconsciously (I don't believe in tue consciousness, as an emergent property, and I think FMRI studies back me up on that*, but we sort of act like we are truly conscious) subjective input-analysis system like the human brain.
* of course there are easier things to demonstrate this: try to remember what you were doing 50 miles behind you on a road-trip when you were driving in corn-country. I bet you can't, but you also didn't crash your car!