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RE: TAS Reviews the Magnepan 20.7

"The .7 series is an entirely different approach to crossovers for Magnepan, which they had not done since the 80s. with 1st order XOs, the German tests show nearly no phase throughout most of the speaker's range above the mid high pass. An achievement all on its own."

Not really. A first-order acoustic crossover has (inherently) no phase shift in its range. There's no special achievement there.
With the proper alignment, even the impedance phase angle will be level throughout the crossover range.

However, you are correct to note that the large radiating surface guarantee's less precise imaging than might be obtained with other (more conventional) speaker systems. This is another inherent trade-off in the design that can't be engineered out with crossover design or equalization or any other technique.

Time alignment is not is not an issue with regard to the bass panels because of the wavelengths involved and the crossover frequency chosen.

Cheers,

Dave.

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