You really need to be patient with this one. Because of it`s size, the small caps needs to be fully charged before it sings. I would estimate they need 100 to 200 hours. But when accomplished, things starts to happen.
Brand new out of the box, it sounds thin, with no bass to speak of, When run in, the midrange is fleshed out, and there are bass a plenty. If it is present in the recordings, that is. A lot of 70`s recordings are revealed as having not much bass, It`s just the neutrality of it, that is showing this. Not a fault. With "normal" recordings bass is of very high quality.
It`s neutrality really shows how you cans sounds. Fidelio X2 is slightly dark, but very musical, and nice controlled bass. Great for rock and heavy metal. HE 400s is slightly bright, but good balance overall. Great for acoustic music. With my slightly modded Beyerdynamic DT150, it is close to perfect. Close to perfect tonal balance, and huge soundstage and great dynamics. My DT990 is too bright with it. Not an issue with my Lake People G109s amp. AKG 702 is still a bit bass shy, but no great issue. Overall it is nice and detailed, with absolutely no sibilance.
Overall the DACport HD is very neutral, clean and clear, and lets a lot of information through.
If neutrality is your thing, and it suits your cans, go for it. It`s really amazing for prize and size.