Upgrade consideration for R1N owners.....tested on headphone only
Listening back and forth with R1N and R8H2 on the DI20HE.
I realized how much the DI20HE has added to the R1N. I would place R1N and the DI20HE a better buy than R8H2(alone).
The R8H2 does win in technicality, authority, and pulls me into the soundstage. However the R1N brings the music into my room. It is contradicting explanation, but R1N plays the music specifically for the listener(surrounding), whereas the R8H2 is more inviting/seducing. The soundstage on R1N becomes bigger, more weight to the notes played, and the improvement is 50% atleast - overall.
This combo is easily at the same level as R8H2(alone) for my taste.
Get the DI20HE, and if the new DI24HE is improvement it will beat the R8H2 strong assumption.
I was trying hard to make the R1N challange Susvara alone, DI20HE was the answer.
Buying any DDC to R1N will improve it noticeably and lift it a class up.
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On R8H2 I only tried NO and N1.
Couple points I want to speak on,
Audio-GD's DAC lineup is really interesting and unique. There is currently only one "affordable" DAC available from them, the R-1 NOS. All their other DACs are significantly larger (size and $$) and quickly feel like overkill for even the above average audiophile, before they even leave the shopping cart. I don't see this as a negative but more of an oddity. You have to wonder what their lineup would look like if the oversampling chips didn't go through a price jump (hence the more NOS only releases).
On the positive for the current R-8 and R-7HE, you will find this mentioned in their description: "
The USB interface itself is no longer equipped with clocks. The synchronous clock is applied to make the signal transmission more accurate and upgrade sound quality to an excellent level. The sound quality is now in fact better then with the previous generation R-8 2020** version fed by the DI-20 (not quite as good as with DI-20HE however).".
I think it's nice that they have added upgrades to these DACs so that their performance as a single unit is identical to that of the DI-20 added into the chain. Now I haven't heard any of these units first hand but I think it's nice that they are continually updated. I would raise an brow to anyone that truly believed in adding a DI-20/24/HE to a $2k-nearly$4k DAC (unless it improved the tonality; which is yet to be tested by multiple people before becoming gospel, not just OCC7N, CMIIW).
On to my next topic. I've had my R-1 NOS since September and am most likely around the 400 hour mark for my own time. Recently I've had it on for 6+ hours a day since I'm home from work for the winter. At this point I can honestly say that the brilliance of the R-1 NOS that I experienced in the first 100 hours is gone. I no longer notice the "sound" of this DAC in my chain. I find myself being more impressed by amps and headphone pairings in the chain rather than the DAC. I no longer feel the euphoria of certain songs like I used to; the feeling of divine reflection quickly after listening that makes me say "wow, that was all cause of this DAC, ridiculous". I don't know if this is because of my chain not being ideal tonality wise (everything too smooth, neutral, analytical, lacking warmth) or it's all just brain burn in. I came from a CMA400i before I got the R-1 NOS. Four years of being used to Current mode amplification and a very decent in a good way, AKM4490 chip. I have recently come to understand just how "warm and gooey" that Questyle sound was that I was so used to. I'm currently not sure of anything in my chain now that I realize this. Is the R-1 NOS dry, analytical, smeared, or just perfectly neutral? I honestly can't tell. I feel like the warm, "wet and punchy" sound was my preference in the past, but I'm indecisive. My ears and listening preferences have changed over the past 5 months for sure. I could sum up the initial criticisms in this paragraph to brain burn in.
The R-1 NOS pulls vocals forward with airy separation in relation to other instruments. Music without vocals is superb with the R-1 NOS, but throw strong vocals into heavy instrumental passages and it starts to feel seriously uncoordinated. This makes me sad since a few of my favorite bands have this style. I also believe that while this DAC produces every note clearly in complex passages, it does sound like everything in the mix is crammed into each other. Well duh! complex music does have everything crammed into each other yes, but I'm only saying that I want the separation to be larger or deeper. Depth in the music is almost one dimensional to me, but this could just be the headphone/speakers. SS is definitely not flat but also not a super isolated with instrument separation. I could also be describing the "exaggerated" decay of notes that I think is a trademark of R2R ladder designs.
All I know is that with my recently acquired topping A70 PRO I'm not a fan, the combo is fatiguing and lacking dynamics. With my D3a Papa Rusa custom tube amp, the sound is seriously impressive and pleasantly neutral/musical. But there is something about this combo that feels not so ideal (perhaps R2R+tubes is too much). The easy conclusion is that this DAC is letting me listen to everything after it in the chain like never before, revealing the strengths and weaknesses of my amp and headphones. I'm not sure how I feel about this. I want to try more amps but I also feel like no matter how many I try, I will only get slight tonal adjustments from neutral as long as the R-1 NOS is my DAC. I think my course of action is to find a SS amp I like (not the A70 pro most likely) and then start to explore other DACs in the future.
So I suppose my takeaway is that I would sooner try other DACs before going for a Audio-GD DDC. If one really liked the R-1 NOS then I could see the DDC as justifiable based on the good things other people say about it here, though I could be overstepping since I haven't heard one. I think I will just dip my toes into DDC, probably get a PCIE I2S card or a sub $300 DDC (used as well).
Also as a side note the R-1 NOS lacks a few features that a lot of chip based offerings have these days. Level control, filters, oversampling, remote, trigger. Level control being the most useful thing I actually need since I listen below 60db most of the time and 2.5V RCA output of the R-1 is too high for my tube amp.