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If I lower the XO I manage to track the target curve without using any EQ. Sub+mains are well integrated.
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I think you answered your own question.
I suspect the receiver is doing its job quite nicely, but my quess would be that the sub likely produces a large amount of energy in the ~80Hz+ area that is reduced when using a lower crossover. The mains because of their positioning or capability likely don't have the same problem, so when their crossover is lowered the trouble at ~80+ doesn't exist. This makes for a better transition. I would leave it at that spot.
brucek