I plugged in my ADI-2 DAC into an old PS Audio Ultimate Outlet. I really like how it's refined the overall presentation of the audio. Overall, the individual instruments and vocals in the high- and mid-range were more distinct, the bass tightened up a little to find it's place better, and everything seemed to be wrapped with a little more "air" around it (in a good way.) I was able to do quick change comparisons with and without the UO. For me, the overall sound was always better with it. I wouldn't describe the change as something hugely transformational. However, I will say the difference put a smile on my face. I was closer to where I expected the music to be. I've struggled with enjoying my main audio rig due to the birth of my wonderful new son. So I've been dabbling in headphone gear for about a year or so. I went through a number of cans (which was fun and frustrating), and settled on the Focal Utopia and the flexibility of the ADI-2 DAC. For 3-4 months I found this to be a reasonably good pairing because of all the adjustments the ADI-2 DAC offers. Purists may look down on any tonal interference in the audio path, but for me it's about tuning something to what I either know the audio track should sound like based upon my historical experience with it over many years or simply to my liking. In my opinion, I think that anytime you're listening using a headphone or IEM you're immediately compromising things. The ADI-2 DAC could use more ummph as an amp for sure. It's DAC isn' the best in the business. Personally, I'd pay 2-3x if RME went all out on this unit component wise. But the Utopia, ADI-2 DAC, and Ultimate Outlet is indeed putting a smile on my face where I look forward to listening to the trio more now. YMMV.