I think you’ve confused R-2R (resistor ladder) with R to R (reel to reel). This thread is about digital to analog conversion.
From reading your original post it sounds like you’re happy with what you already have- what’s wrong with that?
Why do I prefer R2R over Chip based DAC's?
I have had a couple of mid to low priced DAC's. Schiit Modi, Schiit multibit in a card. Topping E30. all inexpensive I know. Am I not spending enough money? I have heard a Schiit Bifrost, I did like it. I am currently using a Topping Octo with the Schiit Midgard for headphones. This has been my best combination to date for a all in under $1000 us. The Octo has good instrument separation and the soundstage is expansive. The Octo does not have that harsh semblance I can not stand. What would be my next upgrade?