Thiel Owners

robinbarbour, While that would seem to make sense, I can't confirm or deny that to be true. Please keep in mind that while up until very recently one could find many attributes that Thiel speakers shared, Jim Thiel got there through various means. With the speakers under consideration, the 3.5's and 6's used eq'd sealed boxes or passive radiators, different box volumes, and perhaps most importantly different drivers and at different price points.

saffron_boots, Yes, Jim Thiel told me that his power recommendations were based upon quality 8 Ohm ss amplification ratings that could double down, and if one were to choose to use tube amplification they should double the power accordingly.

Unsound...

Wow - you actually had an opportunity to speak with Jim Thiel?  I'm envious as hell. 

No other component I've had gives me more pleasure than these 3.5's. For me they've proven to be my reference point for quality loudspeakers overall.  They just get it right. 

I wish I had gotten into hifi again while he was still around. It would have been nice to meet him and thank him.  As some members here may know I've been in the wine business my entire life and I know many great winemakers personally here and abroad.  It would have been nice to shake the hand of Mr. Thiel indeed.  

I'm actually proud that I own a pair of his speakers. They are art in every respect. 

I had the opportunity to speak with him a few times, and he was always a patient, perfect gentleman.
I too am enamored with the 3.5's, IMHO all things considered, it might have been his best product. It takes much more money to get somewhat better performance. Being the absolute bargains they were when new, and even more so now on the used market, I fear that some don't realize that for them to be all they can be, they need to be fed with appropriate gear that could very well exceed the current cost of these speakers.
If your ever feeling generous about wine recommendations, please share! Though they're usually a bit out of my budget for regular consumption, amongst others, I have a particular fondness for both red and white Burgundies, and late harvest Rieslings.:-) 

Just going over the power requirements again....
I have CS 2.7 and from ratings below if I looked for an amp putting out 400 watts into 8 Ω, it would double down to 800 at nominal 4 Ω and 1333 watts at the 2.4 Ω  minimum?

CS 2.7 Specs:
Impedance 4 Ω (2.4 Ω minimum@160Hz) Recommended Power 100-400 watts

My amp really seems puny now...200 at 8 and 350 at 4!