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Welcome!I'm curious as to why you'd be drawn to an American speaker kit.
If you have a woodworker there is the Frugal Horn for 6'' FR drivers, it will increase the bass under 300Hz to backward a valuable feature and yet crossoverless, Dave charge only $20 for the complete plans if I remember well;https://www.frugal-horn.com/FHXL.htmlIn your country there is or there was this dealer.Rumoh -- The Netherlands (Rudy -- this effort may have stalled)http://www.rumoh.nl/
I've heard both GR and CSS and CSS impressed me more in terms of build/design and sound quality. Yet for twice the money passive Dynaudio easily bested the CSS.
As a technican you should appreciate the decades of leading edge R&D that go into products from the likes of Dynaudio, Focal, or JBL. And as a retired engineer I appreciate the advantages of active loudspeaker design. Active doesn't have to be expensive either. Look into JBL 305 Mk2, Kali, Adam, even Dynaudio or Focal.
But I wouldn't discount decades of R&D, or the value of anechoic chambers, true A/B testing setups, quality listening comparisons, etc.
The GR-Research kits have been developed using all of these things you mention. I can personally say their top lines have more than competed against prestigious names at major audio shows- Dynaudio, Wilson, Sonus Faber, TAD. And welcome to Audio Circle, Pleasant0.
diy speakers that can rival the more expensive Buchardt, Sonus Faber, Elac, Dynaudio etc. certainly a well made OB DIY project will have success.