Accuton C30-6-358 CELL

The THD measurements at voltage levels 2.83 - 4 V were carried out with High Pass Filter "on" (2nd order Buttreworth type, 500 Hz cutoff, HPF2-500)

The THD measurements at voltage levels 5.6 - 11.2 V were carried out with High Pass Filter "on" (2nd order Buttreworth type, 800 Hz cutoff, HPF2-800)

I like the sounding of C30-6-358 tweeter, but specific for this model (for all exemplars) very strange intrinsic resonance in the frequency range 7 - 9 kHz, which is not seen on frequency response, but clearly evident on THD diagrams and its high retail price (around $440) doesn't allow give it 5*, so, it gets only 4*...

Fortunately, despite the ugly behavior of THD curves in the range 7 - 9 kHz, I can't hear any artifacts and signs of that resonance