From the manual for the CS2.4:
Comparing Stereophile and Thiel measurements (published in Audiophile Journal archived on the Vandersteen website) it's quite clear that Thiel measured from farther away. Not only do the Thiel measurements indicate much flatter frequency response, the waterfall plot is much cleaner than suggested by Stereophile, with a clean initial decay even in the upper midrange.
Optimum phase and time alignment is provided only for a seated listener who is eight or more feet away from the speakers.There is no mention of ear height, which is very important for the first order filters (ie, vertical dispersion).
Measured at 3 meters.That's >twice as far as Stereophile in JA's open air arrangement and 1 m more than Soundstage in their anechoic chamber. Do you know if Thiel had an anechoic chamber? Or did they measure outside? Must have elevated the speaker well off the ground if the latter.
Comparing Stereophile and Thiel measurements (published in Audiophile Journal archived on the Vandersteen website) it's quite clear that Thiel measured from farther away. Not only do the Thiel measurements indicate much flatter frequency response, the waterfall plot is much cleaner than suggested by Stereophile, with a clean initial decay even in the upper midrange.