Somebody worked overtime on this campaign. I guess what gets me so angry about this issue is the arrogance of the manufacturer. The underlying premise is that the pro audio public is so gullible they will believe anything, if presented profoundly. Well, they are wrong. All of you are a whole lot smarter than they give you credit for.
Street smarts go a long way in solving problems.
The boost curves are mirror images of the cut curves. That means the phase shift of the boost curves are also mirror images of the cut curves. If two things are mirror images of each other, they are complementary. Nothing too profound here. Therefore, not all equalizers have complementary phase shift.