MEASUREMENTS

Because of the Alexx V’s size and bulk, I measured its performance in Jim Austin’s listening room. I used DRA Labs’ MLSSA system and a calibrated DPA 4006 microphone to measure the Wilson Audio Alexx V’s frequency response in the farfield, an Earthworks QTC-40 microphone for the nearfield and in-room responses, and Dayton Audio’s DATS V2 system to measure the speaker’s impedance.

Wilson’s Peter McGrath had adjusted the positions of the Alexx V’s tweeter and midrange modules so that their axes converged on the positions of JCA’s ears, which, with him sitting in his IKEA chair, were 34" from the floor and 138" from the top of each Wilson’s upper-midrange enclosure. I measured the quasi-anechoic response of the left-hand Alexx V, averaged across a 30° horizontal window centered on the position of his ear. However, the presence of early reflections from the room boundaries means that the FFT-calculated response was not valid below 1kHz or so. We therefore estimated what the microphone height from the floor would be at my