Pioneer DS-047A

The HD measurements at distance 315 mm and voltage levels 1 - 5.6 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 300 Hz cutoff, HPF2-300)

The HD measurements at distance 315 mm and voltage level 8 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 500 Hz cutoff, HPF2-500)

The voice coil current HD measurements at voltage levels 1 - 4 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 300 Hz cutoff, HPF2-300)

The voice coil current HD measurements at voltage level  5.6 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 500 Hz cutoff, HPF2-500)

The Pioneer DS-047A midrange driver with a 3” beryllium dome diaphragm was used in the loudspeakers:

Pioneer S-9500 - https://audio-database.com/PIONEER-EXCLUSIVE/speaker/s-9500-e.html

Pioneer S-9500DV - https://audio-database.com/PIONEER-EXCLUSIVE/speaker/s-9500dv-e.html