The THD measurements at voltage levels 2.83 -4 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 200 Hz cutoff, HPF2-200)
he THD measurements at voltage levels 5.6 -11.2 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 800 Hz cutoff, HPF2-800)
The published measurements are for the best speaker driver of a pair