Okay, FWIW.
I am going from Soekris DAC direct to DNA-500 to Thiel CS5i's. No separate preamp.
Listened to John Hiatt "Walk On", Adele "19", and Grant Green "Idle Moments".
Not sure how accurate this is with Google Play Store "Sound Meter":
Soekris volume control set at -22 and Sound Meter is measuring hi 70 to low 80 Dbls.
Soekris volume control set at -27 and Sound Meter is measuring hi 60 to low 70 Dbls.
Soekris volume control set at -29 and Sound Meter is measuring hi 50 to low 60 Dbls.
Soekris volume control set at -31 and Sound Meter is measuring low 50 to hi 50 Dbls.
Initial thoughts about the sound I am hearing
without the CJ 17LS2 preamp:
Almost/definitely uncomfortable at higher volumes
More detail
More contrast between highest and lowest notes
More ambient information - deeper soundstage, maybe?
Feel like I am listening to more sound but less music?
Maybe I have to get used to it and then go back to preamp or preamp/old DAC to really tell what sounds better to me.
First World Problem, I guess.
FWIW.
Thanks for listening,
Dsper