The THD measurements at distance of 315 mm and voltage levels from 2 Volt to 16 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 50 Hz cutoff, HPF2-50)
The actual measured T-S parameters of well broken-in woofer very differ from ones of the datasheet. The measured T-S parameters are showed at the "Impedance frequency measurements" diagrams. Please, take in account this fact when designing a loudspeaker based on 32W/8878T11 woofer