Thiel Owners

holco
Very nice- I am glad that you found at least (1) serial number. Describing the sound of any component can be challenging. Best advice is to talk about your fave piece of musical passage, at the least. Talk about the before upgrade characteristics then add after upgrade factors. Did imaging get better? Soundstage is deeper or wider? Musician(s) are solidly placed? Instrument texture or tone become cleaner/clearer.
Give it a shot!  Again, it is good to have you here as a DIY member of the Panel.

Happy Listening!

ekohn00

Welcome! good to see you here. You have quite a collection of Thiel Audio speakers. Besides the Denon POA A1HDC, what other gear including cabling is in your system? Can you give the dimensions of your basement listening space?  There are a few members here using a home theater set-up. Guys chime in for suggestions.
I look forward in reading more about your system and musical tastes.

Happy Listening!

ekohn00 : corrected.

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

Holco - since you performed multiple changes at the same time, I wish to ask a favor. Can you compare SQ with / without the drain wire?

Thanks, Tom