Declared normal hearing can still hide degraded sound-quality opinions.

Evidence

These are obvious hearing problems, but long before one is aware of a problem, and even when your audiologist declares that you have “normal” hearing, there can be significant changes in one’s ability to form opinions about sound quality. For audiophiles this may be no more than a nuisance, even if they are aware of it. For audio professionals it is a handicap—one that they often are not aware of, but that obviously has an effect on their product. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1064

Categorization

• QUESTION: What specific hearing changes — high-frequency rolloffs, loudness recruitment — degrade sound-quality opinion before an audiogram flags them?