The THD measurements at voltage levels 1.41 - 2.83 V were carried out with High Pass Filter "on" (2nd order Butterworth type, 800 Hz cutoff, HPF2-800)
The THD measurements at voltage levels 4 - 5.6 V were carried out with High Pass Filter "on" (2nd order Butterworth type, 1200 Hz cutoff, HPF2-1200)
The THD measurements at voltage level 8 V were carried out with High Pass Filter "on" (2nd order Butterworth type, 1500 Hz cutoff, HPF2-1500)