I2S Recommendation

I will add Revelation Audio Labs HDMI I2s cable to the list of suggestions. I have one that replaced my Tubulus Argentus, the solid core silver is much smoother midrange with all the details, better soundstage width and depth. 

I tried the DH Labs and RAL i2s cables.  At first I thought the RAL sounded better, but went back months later and did some extended listening switching back and forth between the two, which is easy and can be done quickly since my server and DAC both have 2 i2s connections.  I couldn't tell any difference between the two.  I chalked up my initial impressions to confirmation bias.  I'd get the DH Labs cable.

Tubulus Concentus V.2

My wife does not listen so closely but heard the difference. And the owner is really patient and nice to deal with. A little less expensive than other top-end I2S cables and right up there with them. I would not want to be without my Tubulus Concentus.   

Also, While shorter is better as stated above, the owner assured me that with their design adding no more than 1' is not hearable. This matters if you are using a rack because good I2S cables are a bit stiff coming out of the connectors, needing more turning circle.

-Jeffrey in Philadelphia

I wired my theater system with Pixelgen cables and it made a noticeable difference in the display, although I didn't notice much in the way of audio improvement.

https://www.pixelgendesign.com/ca/thxinterconnect/shortrange

Audioquest Vodka 48 8k/10k work exceedingly well for i2S (though are expensive), I found mine on sale for around $350.....but I needed a little longer cable, so spent the extra cash. Supra Cables .5 meter are excellent at around $65, if you can use that short of a cable