Scoring on Used Thiels here

Unsound ... you are right the Thiel equalizer has a high input impedance ... either the 90k you mention or perhaps 100k.  That is why it can take the high output impedance of the SP6's or other pure tube preamps.  However, its output impedance is very low, so it works well into the 10K input impedance of the Outlaw monoblocks, which is low even for solid state amplifiers.

There are a pr of Thiel 2’s on local Craigslist , look good , wants 250$, is that a good deal ?

Been looking but may have to wait to play with something new  in that some unexpected household repairs came up.  

Problem is WAF will be a problem with 2-3 models large enough to possibly eliminate need for a sub.    1.6 woud work but be more of a lateral move so no huge incentive there. SCS monitors would fit nicely but have not come across those still very much. 

Also still not ruling out various  other lines still as well but not likely to do anything for a while now.   What I have sounds very good but I do like to try different things.  

The info on this thread has been very helpful so thanks  to all for that. 

Schubert, could be. Check the drivers very carefully. Make sure they are from Thiel. Some buy beat up speakers, put different drivers in and dump them on unsuspecting buyers. The drivers might appear to be off the shelf parts, but Jim Thiel often had customized lots just for his individual designs. The cross-overs were adapted to these customized drivers. Note if the surrounds are similar and if the screw hole patterns are properly symmetrical. Use a photo of known samples as a base line. Lower the volume and listen to each driver up close and individually. The grills on the CS 2’s are particularly important on this model, as they are shaped to work with the baffles for the designed dispersion characteristics. If you notice paint removed from the baffles during inspection, don’t worry, Thiel used automotive tape to help keep the grills attach to the baffles. It’s only a hidden cosmetics issue and new tape will bring them right back.