The U18 has 4 different I2s settings. With my Gustard dacs I used the first setting (Gustard). With my new Audio Mirror Tubadour V, I use the #4 setting. That's the PS Audio setting which Tubadour uses. That feature alone makes the extra cost of the U18 plenty worth it.
DDC Comparisons
anyone compared the Denfrips Iris 12th to the Gustard U18?
what else is out there in this price range?
I'm looking taking advantage of the better sound quality of I2S and sending my external clock signal to the DDC, which will then in turn send the clock signal to my DAC (Gustard X26 Pro) via HDMI
or maybe I should just upgrade my DAC.....