MEASUREMENTS

I used DRA Labs’ MLSSA system and a calibrated DPA 4006 microphone to measure the PMC fact.8 signature’s farfield behavior. I left the grille off for the measurements. PMC specifies the fact.8’s sensitivity as 89dB/W/m; my estimated sensitivity was within experimental error of the specification, at 88.5dB(B)/2.83V/m. The fact.8’s nominal impedance is specified as 8 ohms, which the solid trace in fig.1 indicates is appropriate, the impedance remaining above 8 ohms for much of the audioband. The minimum values are 5.47 ohms between 185Hz and 200Hz and 5.15 ohms at 11.3kHz. Although the electrical phase angle (dashed trace) is high at some frequencies, the impedance magnitude is also high at those frequencies. The fact.8 signature will be easy to drive.

Although there are some wrinkles in the impedance traces