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You know what you hear, of course. The L-Pad connection you described above is not 16 Ohms in series with the woofer.
Actually it is. I tried two 8.2 ohm resistors in series AND I measured the resistance of the L-pad once getting the freq flat.
I'll measure 2235 in L200 here. Give me 15 minutes to post it for comparison....
Edit: Near field, 4". There's a 5 dB notch at 500 Hz, a 2 dB peak at 710, and an 8 dB notch at 900 Hz. It's not the crossover. I'm guessin' it's the 4" cabinet lips all around. I'll confirm looking at the other one after dinner....
Re-Edit: Second unit similar (bottom), too much so at the same frequencies for it to be coincidence. I'm now doubting it's the room at 4", but will try a different room tomorrow.
Who else here has RTA and 2235H in L200's?
Reviewing your spectra, maybe dial the MF back to achieve a balance between the LF and UHF instead of trying to bump them both up to match the MF. How well does that work?
450 Hz. is ~30" wavelength.
450, 900, 1350, 1800....