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To keep a similar Fc when doubling the cap value, as there is no change to the midrange filter.
(edit): Now able to look at the plots, the metal dome is a couple dB more sensitive but similar in response shape down low. So it makes sense that moving that up a little would help blend with the midrange roll-off.
He does final tuning by ear. I am guessing his first design was with the Be. Then substituted the fabric and didn't like what he heard and tweaked the crossover to optimize with the fabric tweeter substitution.