A warm DAC?

Mark Levinson No.36 or No.36S.
Both are R2R DACs - if you can find one used.

They also use Class A analogue output stages and are fully balanced. 1995 state of the art. 

Good resolution, definately not 'edgy', nice tight very good bass.
So long you not looking for higher than 16(20)/41(48) DA convertion. 

https://www.stereophile.com/content/mark-levinson-no37-cd-transport-no36s-da-converter-page-2

Basically for CDs, and not for HI-RES streaming/files.
Michélle 🇿🇦 

Hi larseand,
 
I run a PWT with an old ladder DAC, a Theta Pro Basic III. This is with either my Prima Luna Dialogue Premium or CJ 17LS2 as the preamp.

It replaced a Hegel HD25 and slightly rounded off the occasional sharp edge from my Thiel CS5's.

Tested a number of other DACs before I found the Theta.

Thanks for listening,

Dsper

If you can get your hands on an Akiko Audio Squeeze Box, that’s supposed to make any solid state component sound tube like.

larseand OP
Prima Luna integrated

This "could" be your problem, HF transformer oscillation that rings like a bell. Starts at 10khz and shows in the square wave also. Especially with the Focals metal tweeters, it may excite them with hf sibilance etc..
https://www.stereophile.com/images/1214PLDPIfig01.jpg

See how the Focals are very high some 18ohms in impedance in the highs, this is where the Prima Luna also rings it ’s worse with high impedance.
You could "try" not too loud to load down the output of the Prima Luna just to see, with a 2ohm 10watt resistor this will then mimic the green trace which is flat.
https://www.stereophile.com/images/archivesart/707FOCFIG1.jpg

Cheers George

AMR DP-777. Amazing analog sounding DAC with tube input (on SPDIF), R-2R (on redbook and 96 kHz), AND delta-sigma (on hi-res).