Thiel CS2.4 to what?

Audiojan:

My experience says Thiels are way more persnickety of feeding electronics than most.
very resolving, kind of like horns
I also have a sub, To add to the drive that Thiels are a little light on

My experience of going from a 200 watt class D amp to a Pass labs ( big current) was enlightening . The pass added another 2 woofers to the sound and drive vs ICE amp( against normal advice?)
Your note on " not the best recordings" as being shrill, follows my thoughts and ears.
I added great tubes in preamp and that solved my "shrillness" issues.
SS amp with tube preamp to " tune the sound" worked for Thiels

Now, I've switched speakers and am working on the " shrillness" ,again, but to a very small part when loudness is high.
especially when you prefer very resolving speakers

I think older " crap" rock recordings are a tough nut to crack and I am trying a DAC as final tuning for the shrill/ edge
You have the PS Directstream that I was surching for, but evidently is not the solution?
Maybe Chord?

Anyway, That damn system synergy thing!!    Lol

Jeff

Audiojan;

I noticed the Krell amp
They are noted for bass!

I also used Dirac Live for sub integrate
It worked like a charm for sub integration, if you are still light on oomph.
you can play with all the settings and it’s very impressive to tailor the bass
You can try for 30 days as trial with Amarra!

As for your DirectStream, I hear nothing but good & was looking to try 

I found an added Tube with CJ pre really toned down poor recording shrillness

Extra room bounce can & does add to high end nasties.
Moving Speakers should help Or room adjustments like you are doing for bass & soundstage ( further in room less bass is what I found)

Thiel s and good sub ( or room dsp) should make a good difference & should integrate well

ps: I just upgraded to a Revel Ultima2 Studio ( extra woofer drivers recalled helped low end)
I do not think there is substitute for more surface area of drivers to low end 

jeff