I assume however that you mean, he trusts his ears and perception over raw measured data. I doubt that is the case, I think he probably does obsess over measurements, but weighs the measurements differently than the ASR gold standard.
One of the choices that would need to be made in the design of the Troubadour is, where to cross over between the midrange cone and the woofers? I would guess that the midrange cone is good down to 100 Hz ballpark, and I would guess that the woofers are good up to 1 kHz ballpark. Even if the overlap is less than this, the question still remains: Where to cross over?
The higher the crossover frequency between woofers and mid, the less movement of the midrange cone, so the less modulation of the concentric tweeter's output. And the lower the crossover frequency, the wider the frequency region covered by the coaxial unit, so the greater the coherence (theoretically at least), but there may be a power handling reduction if the crossover frequency is too low. There might also be an intermediate crossover frequency region that is above the coaxial's floor-bounce notch frequency, and below the front woofer's floor-bounce notch frequency, at normal listening distances.
And regarding what is essentially a bipolar configuration for the two 12" woofers: There will be a frequency region where the significantly different path lengths to the wall behind the speakers for the two woofers results in their speaker/boundary interference response (SBIR) dips occurring at different frequencies, the one woofer partially filling in the dippage of the other and vice-versa. And then there will be a frequency where the wrap-around energy of the rear-firing woofer will reach the listening area 1/2 wavelength later than the sound of the front-firing woofer, resulting in a cancellation dip... but it would be a comb-filter effect and therefore perceptually more benign than eyeballing the measurements would predict, similar to the way the floor-bounce notch looks alarming but is perceptually fairly benign.
There are probably more competing legitimate considerations than these. Which ones matter the most, perceptually? How should they be prioritized? Well, it might not be obvious (even to Andrew Jones!) what the theoretical best crossover frequency between midrange and woofers would be.
And it just might be that the quickest and most reliable way to pick where the crossover frequency should be is to temporarily use a DSP crossover with quickly-selectable presets and listen to see which actually sounds the best.
In my opinion.
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