Ok, i have to make a disclaimer here, I've been drinking lots of beer
That said, I've never heard either DAC, the Mimby or the Concero HD sound this good, as they have plugged into the Jotunheim. I'm having a lot of fun!! If there's anything I find as a weakness, it's the upper mid bass maybe? I'm not sure. I'm a good musician and I transcribe music a lot, but I have to admit, as an audiophile, I'm a grasshopper, lol. Kind of new to this hobby. Anyway, that said, I'm not sure what you're using as an amp right now, but I'm really enamored with the Jotunheim. It really seems to be powerful, brings music out there! I'm an older dude now, and in my generation, car stereos were important. I remember having some 6 by 9's and had a cassette/radio combo in my car. Then, I bought a high powered Equalizer power amp, and the difference was amazing, I loved the power behind the music driving it. IMO, that's what the Jotunheim is doing. All it needs is crazy lights on either side as it jams out the music so to speak.
Right now, listening to King's X. Great stuff! I plugged in the Concero HD, but went back to the Mimby. I have to admit I really love the multibit tech schiit is doing. But, the Concero HD is a nice piece of gear too. Gosh, it seems like having power in an amp really helps out any DAC really.
Also..I'm listening through speakers tonight! Not Headphones.