Interesting; I'd still argue that what you're describing seems more like a preference than an anatomical difference, though. Maybe the person had damaged hearing? I'm saying that if you went to an audiologist's office and asked them to do a tone test on 100 people, the differences in ability to hear test tones across the spectrum would be small across a sample of folks with normal hearing. I had a Porta Corda back in the day! Ironically, I think I bought it trying to coax bass out of a pair of Shure E4Cs instead of just using EQ.