The HD measurements at distance of 315 mm and voltage levels from 2.83 Volt to 11.2 Volt were carried out with High Pass Filter "on" (2nd order Buttreworth type, 80 Hz cutoff, HPF2-80)
The voice coil HD measurements were carried out with High Pass Filter "on" (2nd order Buttreworth type, 80 Hz cutoff, HPF2-80)