Does your DAC sound better through the S/PDIF or I2S inputs than through USB?


For a long time I used a Windows NUC driving my DAC through USB. (A modified Gustard X20Pro.) Then I got an Aurender N100 which provided a better USB source. I also tried a DAC on the recommendation of a friend in the New Jersey Audiophile Society. People were excited about this there: the Gustard R26.

I found that the R26 is disappointing through its USB input, but excels through the Coax S/PDIF input using a Gustard U18 Digital/Digital Convertor.

This probably points to a subpar USB implementation, to be honest, but I started wondering if this is a general pattern among DACs that can take both S/PDIF and USB.

Anyone find something similar in their DAC?

For example, I'm interested in a Schiit DAC (not sure which model yet). Now that I have the DDC I can drive it through Coax and compare to USB. With the Gungnir 2, I may not have the choice of USB because they have a USB C connection and my only good USB cable is A to B.

Note: what is wrong with the R26 through the USB input: very light bass, unintegrated treble (sibilance kind of clouds over the sound and doesn't integrate with the body of the instruments)

magon

Showing 1 response by presmara

Hi audio friends. I found in my system ( Antipodes K50 G3 connected to Payback Design Dream DAC MPD-8 Gen2) it depended on the quality of the cable on what sounded best. In blind audio tests with an audiophile buddy of mine who did the cable swapping are my findings. This of course is all system dependent. BTW speakers are Gauder RC7D mk2 which ultra transparent and unforgiving if you feed a bright signal. 
 

Over years of critical listening and countless cable comparisons — USB, Ethernet, and otherwise — I’ve rarely come across a digital connection that transforms the entire character of a system quite like the Acrolink 7N-DA6300 solid core AES cable did between my Antipodes K50 G3 and Playback Designs MPD-8 Gen2 DAC.

From the moment it was installed, the system bloomed with an astonishing three-dimensional soundstage, delivering an organic, utterly non-fatiguing presentation. Instruments and voices locked into place with uncanny realism — each performer rendered with startling depth and presence, not just across a wide stereo spread but in a layered sound field that felt alive. Compared to high-end USB and Ethernet alternatives, the Acrolink AES wasn’t just different — it was in a different league when it came to coherence, spatial stability, and emotional connection.

 

Intrigued, I later added the Playback Designs PLINK reclocker, using the USB cable supplied by PBD. To my ears, this moved performance yet another step forward. While the tonal balance and spatial attributes remained remarkably close to the AES presentation, the bass gained newfound solidity — not in quantity, but in density and definition. There was also an undeniable improvement in system silence and flow, likely thanks to the galvanic isolation introduced between server and DAC.

Now, six months later, I haven’t felt a single urge to tweak or upgrade anything. The synergy between the Antipodes, the Acrolink AES, and the PLINK-fed MPD-8 Gen2 delivers a level of musical truth I once thought could only be approached in analog. It’s not just technically excellent — it’s emotionally immersive and deeply satisfying.

Hope this helps the discussion. Cheers Mark