Active crossover feature

[ogs]

Then you'd need a DEQX HDP-5 with Reference Calibration Kit for speaker unit correction and advanced cross over design. The built in cross over function in the Devialet amps would be inadequate for this task as it does not contain group delay correction or equalising for individual drive units. The difficulty getting this to sound good would be massive.

Wouldn't it work with a basic Devialet crossover feature, and than bringing the speakers to a dealer equipped with SAM lab?

I doubt that very much.
SAM lab does not do full range correction the way we'd need it here I think. Would be a very expensive experiment  if you buy everything and then find you can not make it sound good!
Don't get me wrong. I am all for electronic (or digital) cross overs, but without the intelligence built into a DEQX a normal audiophile will have difficulties making good sound.
It would be much easier to guarantee good sound with a single D200 and YG-Acoustics Carmel 2 or Hailey. If Devialet keeps their promise and lets us use the DSP for room correction filters we'd be even better off.