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So when we get past electrical characteristics and deal also with the mechanical output of the actual drivers, we find that the ‘text-book’ electrical filter designed coil and/or cap often need to be adjusted to get the net amplitude output of both drivers to sum flat.
OK, So to what extent does having a less than ‘text-book’ electrical filter mess with phase unity of a 1st order crossover network at the speakers’ output?
As, my underlying question (assuming drivers in this example can handle additional loads put on by a 1st order network) is; is this adjusted less than ‘ideal’ 1st order still better on a relative basis as compared to the phase issues (and associated off-axis peaks and troughs…) associated with higher order filters?