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Excellent :) I totally blew past driver EQ and xover band balance :o:. Nice save Bo!

if you persist with the meter/RTA method, I suggest you use warble tones for the source
and an analog meter representation (meter/bargraph/whatever), not numeric.
Narrow resonances are more readily...

I think for < $100 TruRTA can do a swept measurement (not RTA, but higher resolution).
Great story, and nice to see a project come to fruition.

nice. manual is online... shows optional component values and placement on boards.