MEASUREMENTS: LOUDSPEAKER
Oct 15, 2019
4 minutes
—John Atkinson
I used DRA Labs’ MLSSA system and a calibrated DPA 4006 microphone to measure the Vandersteen Quatro Wood CT’s frequency response in the farfield and an Earthworks QTC-40 mike for the nearfield responses. I left the loudspeaker’s grille in place for the measurements, as it provides the necessary acoustic boundary conditions for the drive-units.
Vandersteen specifies the Quatro Wood CT’s sensitivity as 87dB/2.83V/m. My estimate was 83dB(B)/2.83V/m, which is lower than average but within experimental error of the 83.5dB/2.83V/m I measured for the earlier version of the Wood. The nominal impedance is specified as 8 ohms ± 3ohms. The original Wood’s impedance
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