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, 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!