The THD measurements at voltage levels 2.83 - 5.6V were carried out with High Pass Filter "on" (2nd order Buttreworth type, 500 Hz cutoff, HPF2-500)
The THD measurements at voltage levels 8 - 11.2V were carried out with High Pass Filter "on" (2nd order Buttreworth type, 800 Hz cutoff, HPF2-800)