The HD measurements at distance 315 mm and voltage levels 1.41 - 5.6 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 50 Hz cutoff, HPF2-50)
The HD measurements at distance 315 mm and voltage level 8 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 80 Hz cutoff, HPF2-80)
The voice coil current HD measurements at voltage levels 1.41 - 4 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 50 Hz cutoff, HPF2-50)
The voice coil current HD measurements at voltage level 5.6 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 80 Hz cutoff, HPF2-80)
Before taking the measurements the speaker had been very good broken-in
The detailed review of the M142T-6 speaker