Different R2R DACs

Every DAC I've owned has had a unique sonic signature, just like every analog source has sounded different. 

In the R2R realm, I have a MHDT Labs Orchid and an Aqua La Voce S3. I had a Schiit multibit Bifrost for a while. 

The Orchid is warm and "analog" sounding, but not the most detailed. The Aqua is very neutral sounding and more detailed. The Bifrost is great for its price, but had a bit of an "edge" to it I couldn't live with. I had a Mytek Liberty DAC and would choose any of the three I mentioned over it. It was very "digital" sounding and a bit bright to my ears. 

My Teac NT-505 is not R2R, but strikes a nice balance between a bit of warmth, detail, and easy to listen to "analog" like sound. 

I agree that it's more about the implementation than the technology and more about what sonic characteristics you desire. 

If your ears and / or system aren't good enough to detect differences, then it doesn't really matter what you use. 

op

my 2 cents as follows

- harbeth c7 es3 is a warm toned speaker, with a full mid bass, you have done well to use solid state electronics, though i think purifi modules’ sound tend to ’flatten out’ the sound some, and given this, i would go with dac choices that have clarity and drive (but with smoothness as well), a slightly forward quality, rather than the overtly richer more euphonic sounding dac choices

- as such i would err in the direction of the dena terminator or better holo models, rather than aqua voce, mhdt, lampi’s, audio mirror, which definitely add more tubey warmth at some expense of prat, air, overt detail

- others that i suggest you might also try, are chord dacs (hugo tt2 for instance), soekris 1541/2541, or benjamin zwickels mojo dac - each with great clarity and smoothness but without the robotic, extruded quality of sound that comes with lesser, cheaper dacs that have upfront treble

- as you move up in cost in the dac game, i find that ’you get your cake and eat it too’... meaning, you get space, air, effortless detail, but with no trace of digital grain or mechanical quality to the sound - and you can choose a slightly leaner/cleaner solid state type or presentation, or one with a touch of tubey richness and smoothness, but still with excellent pace, drive and timing

Copy and pasted from another thread:

Rockna wavelight is one hell of a DAC.

It’s and FGPA R2R DAC that has the clarity of a chip based design, massive soundstage, 3D Layering, and a very accurate timbre. Bass has weight, density, agility, and is very transparent to the source.

You might want to throw that on your list.

Goes up another level if you use a good power cable and aftermarket fuse.

I am using a PC with a modified Matrix H USB card, battery powered, into the Rockna USB input via Silver/Gold foil USB cable. (Roon/HQPlayer DSD 512)

Rockna has the weight and density of an R2R design, with the transparency/Clarity of a chip DAC.

You might want to give it a listen.

I am really satisfied with my Rockna Wavedream BAL Signature

You should try the wyred4sound 10th anniversary dac, it's the most analog sounding dac I've had in my system and the reviewers are saying the same thing,