To the point you can judge products without hearing them, TotalDuc being one, amazing!
Arnaud
Indeed, it is rather amazing! Yes, based on my own experience with so many DACs, examining their designs, I can almost get a sense of how something will sound.**
I'm more than inclined to believe that the TOTALDuc will have great tonal, textural, liquid qualities with no delta-sigma treble hash. However, I have always, always, been suspicious of the resolving capabilities of R2R DACs. The fact is, delta-sigma designs do on average (for audio applications) have better accuracy than R2R designs, especially the discrete or magical black-box solutions. Cheap, small, and resolving were always the advantages of delta-sigma and why delta-sigma was permeated 99.999% DACs sold today.
- On the current iteration of the Metrum DACs, which I and even some owners had indicated, are weak in the resolution department, uses an industrial DAC chip. It's been speculated what this chip is on other forums (Metrum scratches the markings out - how ghey). I looked up the spec sheets, and yikes - it's absolutely craptastic in terms of accuracy. (again, this might not be the right spec-sheet - only speculation.) Explains a lot and one of the reasons (there are obvious other reasons) why Metrum had to stack 4, 8, 16 of them to get good accuracy from them.*
- I've enjoyed the MSB DACs tremendously. The Analog and Platinum (worse than the Analog in some respects) are craptastic in terms of resolution, but have great tonal, textural, liquid qualities with no delta-sigma treble hash. I almost, almost bought one, but I decided otherwise because I knew I wanted the resolution of the best delta-sigma DACs out there. Even the uber MSB Diamond... more resolving. It has the better black-box modules. Still not enough - not as good as the best delta-sigma DACs I've heard.
- The old TDA1540 (14-bit with 4LSB) and TDA1541/2 (16-bit with 1-2LSB error - this spec is very very doubtful, I've heard that it's no better than 15-bits, and even then it's probably worse than that.) as used on the Valab and TeraDACs. They also suck in terms of resolution.
- The most resolving R2R chip I've heard is probably the PCM63 followed by the PCM1702 and maybe the UltraAnalog Modules (two high accuracy 8-bit chips stacked with 4 resistor ladders). And even then, these R2R solutions need to be stacked (doubled up or more) to get close to the resolution of really good modern delta-sigma DACs. The Audio-GD M7 I had used 8x1704 chips - and even then, the imaging sucked because the digital filter implementation sucked.
- I'm sure you've also heard of the Soekris R2R DAC board. My friend Misterrogers has been playing with it. Sounds great he says. I trust him. He's heard the Yggy. The Soekris R2R is not in the same league of the Yddrasil in terms of resolution.
- Also, I've found that the practice of stacking chips (evens out errors) does increase resolution. I stacked 3x AKM4393s, and yes, that sounded more resolution than 1x AKM4393. DAC engineers don't stack chips for fun. There's a reason for it.
Bottom line: While there isn't enough data to write a paper, I'm at least satisfied, at least for myself, that DAC accuracy does make a huge difference in sound quality.
As far as crossing the TotalDuc off my short-list: I know what my sonic priorities are. When it's
published in Six Loons (a webzine that says everything is great) that the TotalDuc has no better than 14-bits of resolution, I know I can cross that DAC off my list, especially when it costs 7000-10000 euros. **** that. I'm not saying the TotalDuc will not be a great DAC. I'm sure it is. I'm just not willing to pay so much for something that will be resolve the full 16-bits. Also, keep in mind that I'm running Yggy v0.99 through its paces trying to break it right now. Ho Lee *** - I would have never expected how much musical information is still contained on old CDs of questionable audio engineering quality from the 80s. I mean, why would I want to spend $10K and then down convert to 13/14-bits every CDs that I have?
P.S.
Another thing regarding the blathering from Schiit: I like to trust but verify. This is why I went out to get Theta Gen V (I suspected same / similar DSP) and audition a four dozen other DACs, a dozen of them in them in the mult-thousand dollar range. I wanted to find out if Mike Moffatt and Jason Stoddard were full of **** of the accuracy thing, missiles, close-form filters, some of their opinions of certain chips of yesteryear, etc.
*On this thought, at least industrial, medical, military R2R chips do publish DNL/INL accuracy plots. They don't do that for audio R2R chips - which is kind of scary if you think about it.
**"It's the implementation, not the D-A chip / circuit" - that's the biggest load of BS I've heard. Yes, implementation does matter, but D-A chips all do have a "sound" to them.