I auditioned the Treo CT and the newest 2CE Signature III against each other for a long time, and chose the new 2CE to replace a 20 year old pair. At the time I was considering a like-new pair of Treo CTs (1 year old, $6000), and I still second-guess myself for not getting them. They don’t come up for sale often.
I think the newest 2CE is arguably a better speaker than the 3, and my dealer said the same thing. It’s certainly a better value. I would get the Treo CT instead of a pair of 3’s for sure.
Virtues of the 2CE Sig III:
* Price ... a superb value.
* Better bass extension than the Treo (though the bass the Treo has IS superb)
*Same mid-range drive as the Treo CT, iirc
Virtues of the Treo CT:
* Gorgeous speakers, and much better spouse acceptance factor esp. for a living room
* More solid cabinet, fewer resonances
* Carbon tweeter. My 63 year old ears couldn’t hear much difference between it and the 2CE, and the midrange of the two seemed equal. Said to be a better tweeter by "everyone" though.
* Can be placed closer to the wall without messing up the bass response
The salesman at my dealer owns a pair of 2CEs that he has paired with $20k of amp and preamp, and he says they just sung beautifully. With every improvement to the front end, the speakers rose to the occasion. When I was trying to choose, he warned me that the Treos might reveal deficiencies in my front end more than the 2CE’s did, which meant upgrading everything and I couldn’t do that. The other salesman there has Treo CTs to which he’s added a pair of subwoofers (the alternative could have been the Quatro CT), with an Audio Research front end and Chord Hugo TT2 DAC, and he says it’s magical. More $$ than I have!
I am in the process of investing about $10k in amp/preamp or integrated soon, and I think the 2CE’s will rise to the occasion. Of course, that’s pocket change for some of you! Maybe later I will switch to the Treo CT. Maybe.
Long-winded tale, taking it FWIW. Good luck.