The THD measurements at distance of 315 mm and voltage levels 2.83 - 4 Volt were carried out with High Pass Filter "on" (4th order Buttreworth type, 1200 Hz cutoff, HPF4-1200).
The THD measurements at distance of 315 mm and voltage level 5.6 Volt were carried out with High Pass Filter "on" (4th order Buttreworth type, 1500 Hz cutoff, HPF4-1500).