Thiel Owners

I had the 3.5 and got last year the 3.7. I can argue both ways: the mid and highs of the 3.7 are superb, but the bass and extended bass can be improved with subs. They're improvements that shine in a large room. Now, it all depends on the room. If your 3.6 work for your space and more importantly, you have learned to like them for what they are, and all the drivers and xo are good, any change to a 5,6,7 or 3.7 will involve a trade off. Proceed with caution, and clarify your goals depending on your situation. By tailoring my 3.5 by going with tri amping, replacing some drivers and carefully applying dsp, I was able to approach the listening experience of the 3.7 using the 3.5 in the space they were located.

Thielrules, It seems your takeaway is IF you spend all the money on tri-amping, finding which drivers to replace or update with limited available resources, and (to some of us, compromising your signal chain by) using DSP that's not commonly done in most higher-end audio systems, only then will a 3.5 "approach" the sonics and performance of a baseline 3.7.  Even if his 3.6 is X% more-evolved than the 3.5, it would seem the 3.7 would be an easy replacement recommendation with an appropriate room acoustic?

Yabe1951, I have been powering my 2.4s with a custom SMC upgrade to my McCormack DNA-0.5 for a decade now.  We designed the upgrades for synergy with Thiels, including a scad of current drive into low impedances.  The pairing is perfect.  A recent amp shootout confirmed how well this amp sounds compared to the best-regarded amps of today in the $5k-15k range.  I can confidently say your amp will never need replacement for purposes of better sound!

yabe1951
Welcome! Good to see you here. Thielrules and sdecker offers sound advice.  In order to determine if the upgrade via a pair of CS 3.7 is warranted, seek out another audition. 10 years is a long time between demo time. 10 years ago Ayre had not invented the Twenty Series of gear.  Much changes.  Either way you go, retain your 3.6 or purchase 3.7, McCormack amplification  is a sonic match.  Several members of the Panel,  here and on other Audio forums, enjoy the McCormack brand.Keep us posted on your Audio journey.
Happy Listening!

@yabe1951. Nice amp and speakers you have.  I own both the 3.6 and CS6.  Thielist makes a good point about tradeoffs.  I am using the CS6 because I have a large room and the 6 is more dynamic than the 3.6.

However, the 3.6 is the most transparent speaker I have had in my room, you give up just a tiny bit with the larger model 6.  They are definitely cut from the same cloth - both are excellent.  The CS6 fits my needs in my room better.

I never warmed up to the 3.7 after much anticipation being a longtime 3.6 owner.   I thought Thiel got a little aggressive on the price 12K to 14K. I know it was innovative and an upgrade but the 3.6 has always been my favorite speaker.   Hope that helps your decision.

sdecker
what are the power ratings on your McCormack DNA 0.5 amp?
Happy Listening!