Denafrips Pontus vs LKS vs Gustard

No I have not, but I can say this. With my XMC-1 I tried the Intona both with and without the Singxer in the loop, I much preferred the Intona alone vs with the Singxer. Tim Connor at Kitsune also stated the Intona had, or has considerably more effect than the Singxer and that they approach USB in different ways. There was no reason to doubt what he was saying.

I would be very surprised if you installed an Intona and not be surprised at the improvement. For those implementing a computer based music server with USB connection the Intona in my humble estimation has to be the current bargain of the decade, and they have the measurements to back this up.

I don't want to say too much at this point about the Holo but did get a chance to listen last night for a couple of hours. It sounds very nice, extremely smooth, yet detailed on all music I played both 16/44 and higher resolution. I did not employ any over sampling and kept the unit set to NOS (non over sampling) throughout. I'm inclined to say its just to the warm side of neutral thus far, has a wide, deep and immersive presentation. I want to point out the Singxer was in the loop outputting I2S to the Holo, but I also want to try it with just the Intona feeding the signal to the Holo. 

I'm not a big believer in components taking hundreds of hours to break in and at the risk of offending some people feel this notion is a bit preposterous. However I do think changes occur with most components (especially transducers, ie speakers, cartridges etc) over the first day or two albeit fairly incremental. Have another busy day today, but will should have time again this evening to see what changes might have occurred. Like all solid state gear I leave them on 24/7 including the Holo. It does stay warm to the touch, the case being the thermal relieve given that the entire thing is 5mm thick on all sides. Suffice it to say its built like a tank, not a tin can.

@routlaw Is there a chance that you can try DSD512 in NOS mode via HQPlayer/Roon with the Holo Dac? It’s possible with Singxer>I2S>Holo AFAIK.  I am asking this because some people reported that this led to the best sound they achieved from the Holo Dac.

Your comments on preferring the Intona alone (without the SU-1) really made me curious now. I wonder what results you will have with Intona>Holo. All i read online was one does not need the Uptone USB ISO REGEN when using the SU-1 mainly because it has no effect or makes it worse sonically. Seems like a different story with the Intona.

I don't use either HQ Player or Roon and am on a Mac so it doesn't do do native DSD in the first place. So I guess I can't help you with this. 

The Intona IS different, talk with Tim Connor at Kitsune he is very convincing and again has the measurements to back it up. Its not pseudo science, black magic or and I hate this term snake oil. In fact these things were not initially designed for audio use in the first place but rather the scientific community for measuring devices as well as the medical industry. Audio only came into after others discovered, maybe it was Tim for all I know.

I do plan on using the Intona solo into the Holo bypassing the Singxer but last night just wanted to hear if the Holo had changed or improved in any manner after running in for 24+ hours. It did, and all for the better to my ears. I always try to do only one thing at a time rather than change 2 or 3 then make some invalid claim about how good or bad something performed. Cutting to the chase I am duly impressed with the performance of the Holo at this stage. What few and minor reservations I might have had on the first day were eliminated yesterday.

Stay tuned, more later.

So I guess we never found anyone that could compare the initial 3 DACs mentioned in the title?

Since I was the OP on this I will respond and concur apparently no one has compared these DAC's. However I am happy with the Holo Spring and for now find it unlikely I would ever return to using a Sigma Delta DAC vs any of the R2R Ladder DAC's. Perhaps this might help to some degree.