Roman,
I suggest that you do add the mass in driver like coins in driver cone(and measure the coin weight too) and do added mass free air impedance test then you can see where it can bring another low resonance .then when it reaches 20% lower the free air you are getting the most out of your driver .so in loaded horn you can be sure how much foam to add and having the goal impedance you can be almost sure everything is right. and i suggest not to try more than 20%
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