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John f3 of 173 is well above Fs of driver 67Hz. How did you get those numbers?
Fb is the box resonance to which you tune using port to get the desired F3,which is -3dB roll of point in SPL,rt?
I do not know what I am trying to achieve here.
Here are the SPL plots at 1M ,1/6 Octave smoothed.
John please see the comparison of near field response from right speaker with two tuning frequency.
It is still good with harshness gone with bass boost applied with tone control in my amp.
Fostex specs sheet says Fs for this driver is 67Hz. I am wondering how Martin and you picked Fs as 70?