No Access The Journal of the Acoustical Society of America 152, 1856 (2022); https://doi.org/10.1121/10.0014175 The measure H1–H2, the difference in amplitude between the first and second harmonics, is frequently used to distinguish phonation types and to characterize differences across voices and genders. While H1–H2 can differentiate voices and is used by listeners to perceive changes in voice quality, its relation to voice articulation is less straightforward.