I2S Recommendation

What input best depends on how well each interface optimized. The Harmony usb interface nothing special so its very possible I2S will provide superior sound quality. In my case I was using Sonore OpticalRendu with Audioquest Diamond usb with Harmony at first. Later went to OpticalRendu feeding Denafrips Gaia usb, Gaia to Harmony via  .5m*Tubulus Ximius, Harmony sync'd to Gaia's superior I2S clock. 

To really take advantage of I2S potential, one should have highest quality OXCO clock in streamer or DDC vs dac internal clock, so superior timing via syncing to the external clock. Also keep I2S cable short .5M or less, longer cables throw off timing defeating much of the advantage of the external clock. 

While the Harmony was nice enough via usb, going this particular I2S route really upped the game, greater resolution, transparency along with more analog like presentation.

Ricable from Italy.

Model F1MKII one meter.

ricable.com

https://www.ricable.com/en/hdmi-cable/

@sns Congrats on your Ximius.  I've read many acalades regarding the Concentus, but have not found much regarding the other Tubulus i2s cables.  Other than being "top-of-the-line", what did you learn that led you to the Ximus?

Has anyone tried the entry level Tubulus Argentus?

@audiostick What I've learned after more than 10 years streaming is silver cabling superior to copper, this with ethernet, usb and I2S cables, the higher the silver content the better. Using all Audioquest Vodka for ethernet, AQ Diamond for usb, and of course the Ximius for I2S. Haven't used the other Tubulus cables. Silver is a better conductor than copper, I hear greater resolution, transparency with high content silver. 

The only true I2S company is Tubulus Audio ,Tubulus strictly audio and no dielectric smearing the timing ,just  read their philosophy .

AQ  has a dragon audio I2S   Tubulus Ximius is the Best I have encountered