Upgraded the internal wirering with Supra Ply 3.4/s cable's and also grounded the coax crossover backside, coax and woofer frames, crossovers are placed on the side wall's to gain more distance between them and shorter wirering, low mid and high details and imaging are improved and got more air overall, bass is clearly tighter.
https://www.diyaudio.com/forums/multi-way/332679-thiel-cs2-4-xover-schematics-2.html
https://www.diyaudio.com/forums/multi-way/332679-thiel-cs2-4-xover-schematics-2.html