That calculation is made by my friend who is speaker builder/designer. He has also developed VituixCAD loudspeaker simulator. https://kimmosaunisto.net/
So you can rely that calculation method is correct. He said that Devialet crossover is almost like Bessel but actually is not. He named it as Dessel
So you can rely that calculation method is correct. He said that Devialet crossover is almost like Bessel but actually is not. He named it as Dessel