PS Audio Perfect Wave DAC upgrade to DSD?

If you're otherwise happy with the speakers, I would consider upgrading the crossovers in your Thiels.  Better capacitors on my speakers (Duelund CAST Tinned Copper on Coincident PREs) eliminated some light smearing and brightness/sibilance in the highs.  There are some threads on Agon documenting the process for Thiel speakers, and I think Jim Thiel's son will actually help you with the process if you contact him (it either happened in the Thiel owners thread, or those folks will know how to contact him).

I'm clearly getting a different experience than others, but I've upgraded my PWD MKII to a DSD twice and both times ended up going back.  I don't know what it is about the DSD that doesn't work for me, but that's been my experience.

Whoops, should have just gone with "relative" rather than guessing son!  Glad you posted the correction. As for the dsd, obviously many people love it, maybe most. For me, it just doesn't sound natural. Don't know if it's my speakers or what, but I don't hear what everyone else does... and I tried twice.

And I wouldn't be too scared of soldering. Since you won't be putting heat directly on a driver, I doubt you could do anything to hurt your speakers. The worst case scenario is that you over cook a new crossover part, and those odds are low. You don't happen to be in Colorado do you? Happy to help upgrade if you are...

One last suggestion... If you've got the space, you may also consider using screw connections throughout the crossover.  It eliminates soldering and let's you easily swap out capacitors to try different types. That's what Nelson pass uses on his home speakers... see photo #5: https://jeffsplace.positive-feedback.com/jeff-checking-in-pass-labs-xa25-amplifier-and-the-duelund-a...