No, this is for the new Series 3, which is near the end of the R&D cycle. First two pairs are being readied for sale, tour, and reviews.
The image was part of an email I sent out to my inner circle. I post it here now.
These curves are at the listening position, with 41" microphone elevation on the reference axis of the speaker, both speakers driven, 1/12th octave smoothing, 2ms window. There is no room treatment.
30Hz was very hot, and 50Hz very cold. By shifting the phase of the right woofer only with a low-frequency high-pass filter, I effectively "move" the 50Hz anti-node off to the side of the listening position. So now 50Hz will respond to EQ. Without this phase quadrature method, 50Hz remains a perfect cancellation and it wouldn't respond to EQ.
The same holds true for the 30Hz room mode. Since one woofer is 90° phase shifted from the other, they don't sum as high at the node frequency.
Note that the phase relationship of each woofer is unchanged at the cross point to the midrange. So this does not detune the lower crossover in any way.
The alternative (last week's attempt) was the more customary approach of using straight PEQ filter to tamp down 30Hz. But this prevented any attempt to fill in 50Hz.
Now the bass sounds much more solid and with more slam in the middle bass. Just two global EQ filters used, and one additional "crossover" filter on one channel only.
