ArmchairPhilosopher
Headphoneus Supremus
I'm not sure I understand your question, so please forgive me if this turns out to be a non-answer or even entirely missing the point.A question. A few years back I included a Yggdrasil OG with some DAC's friends and I were comparing. Today would the best bet be the Yggdrasil + or the More is Less? I have not paid much attention to the changes myself but the present write up on the + seems to put it on the top. I used my own Gungnir last time and it did fairly well so I may still use it for a reference.
The '+' only denotes the upgraded chassis. With that upgraded case come a few fringe benefits, like the ability to disable the upsampling part in Mike's filter ("NOS mode"), an IR remote control, a mute button, and less of a hassle in case you need to open the thing for future upgrades.
But the boards in there remain the same as they were a few weeks ago, with the same three flavors: OG (the Analog Devices "A2" boards), Less is More (16 bit Texas Instruments), and More is Less (20 bit Texas Instruments).
As for which would be considered "best suited" to serve as a reference DAC for your tests? Gosh, who knows…
Reading between the lines, Less is More seems to sell the best. But that doesn't necessarily mean much in terms of actual sonic performance. For one, it's quite a bit cheaper than the other two flavors, so that alone gives it quite the edge. Second, its name sounds more positive ("Less is More" vs. "More is Less" — the latter just sounds, well, less good).
Personally, I only really intimately know the sound of the OG flavor, meaning the AD boards, so I don't actually know if LiM or MiL sound any "better" than OG. But I do also own a Gumby, and I use both the Yggy OG and the Gumby on a daily basis. And for what it's worth, at least to my own ears, Yggy OG is everything as good as Gumby is, only more refined and nicer in pretty much every single regard.
Based on that, and since you said that you enjoyed your Gumby quite a lot, I'd say that Yggy OG might be the best bet for your test setup.
There's also nothing wrong with sticking with your Gumby. It could serve as a known constant for your tests.
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