On the Bench (JEJ)
At 50 Hz and 100 dB output, with the microphone at 10" from the woofers, there was 4.8% THD.
At 100 Hz, we measured much less THD than there was at 50 Hz.
At 1 kHz, there was less than 1% THD measured from the midrange driver.
The tweeter produced less than 0.5% THD with a 5 kHz input signal.
IMD was a very low 0.09% using 5 kHz and 6 kHz input signals.
At 10 kHz, still less than 0.5% THD.
The measured frequency response (quasi-anechoic) showed a tendency to rise throughout the midrange to a peak at about 4.8 kHz, then slowly decline. This could give a sense of brightness in the sound.
Impedance has a low of 7 Ohms and a high of 24 Ohms. The average would be somewhere around 13 Ohms, so these speakers would be an easy load for mass market receivers to drive. The electrical phase stays well within ± 450.