Frequency response is the principal determinant of loudspeaker sound quality.

Evidence

The one of greatest importance in audio is the amplitude of electrical signal or sound level vs. frequency, or as it is commonly known: the frequency response. It is the principal determinant of sound quality. — Toole, Floyd E, Sound reproduction- the acoustics and…, 896

Categorization

• DEFINE: Defines frequency response as the central measured quantity in audio and its role as the main determinant of sound quality.