gpaulmg1 OPYour 3.6’s are a great speaker, even by todays standard, keep them. But they MUST be driven with an amp that does good hefty current down to 2ohms
https://www.stereophile.com/images/archivesart/Cs36fig1.jpg
gpaulmg1 OP Upgrades for Thiel CS 3.6?This will make your Thiels sing again, do not discount it as they are well over the date where the ferro fluid has dried out into glug and killing the performance of that great tweeter.
https://forum.audiogon.com/posts/1898655
Your sound will open out more, become more dynamic, even the bass will have better leading edge to it's snap.
Cheers George