Peerless TC9FD18-08

The THD measurements at voltage level 2.83 Volt were carried out with High Pass Filter "on" (2nd order Butterworth type, 80 Hz cutoff, HPF2-80)

The THD measurements at voltage level 4 - 11.2 Volt  were carried out with High Pass Filter "on" (2nd order Butterworth type, 150 Hz cutoff, HPF2-150)

The near field distortion measurements (20 mm from the dust cap) were carried out at voltages down to 0.5 Volt with the aim of assessment of speaker bass potential when working in a linear array 

Taking in account the high technical performance and very low cost, TC9FD18-08, in my opinion, is just incredible speaker!