"Good catch. I saw this last evening and wondered how long it would take for someone to notice it. According to Jeff, the graphs he supplied during the design process were based on anechoic measurements of the raw drivers and are not representative on the real-world response of the finshed speakers in the designed cabinets."
I'm not sure that's quite the explanation. Without an anechoic chamber, it isn't possible to capture anechoic measurements below about 200 Hz. The sample window is too short to get a good read on the wave lengths involved. My best guess is that Jeff took a nearfield measurement of the woofer and spliced it on to the rest of the driver measurements. But either way, the woofer measurement will not capture room gain, and the actual - 3db and 6db points will be lower than shown. And the region above 200 Hz is amazingly flat. Sure wish I could make it out to beautiful downtonw Livonia to hear these things.
