A, the Dutch&Dutch have 24 inbuilt parametric EQ filters so you can adjust them, which I can attest is really useful when you install completely full-range speakers in a domestic room.Was reading a dutch test about D&D 8C conclusion was great speakers but quite difficult to implement the roomcorrection. Basicly if you change your room setup you have to start from scratch. I can relate to that with mine own setup using mathaudio room EQ. I have different measurments for instance listning with curtains open or closed the difference is quite noteble. I realy had to learn how to do proper measurments with the neccecary microfoon measuring points etc. Don't know how the D&D measure the room but probably it is quite difficult esspecialy if you don't have the needed knoledge. Don't think age have anything to do with that.
I use a microphone and REW software to measure the room, I only tend to correct the major low bass ( room mode) peaks, I suppose you could create a ‘curtain’ filter, they take seconds to create and you can enable/disable them on the fly from the 8Cs app.
Keith