I have the Cross-1 Corda standalone and absolutelly love it, distortion??? Not at all, or better not more than other sources as a bad cable, or a bad source, or a bad mic used in the recording, and many others, we live in a distortion loaded world...but I have not heard the effects of the standalone unit yet and I heard very complex music. Maybe you need a more resolving headphones or a better source (BTW mine is nothing spectacular neither) I silver wired it and it sound pretty neutral, saving of course what is natural in that device due to the circuit.
The standalone unit offer also the advantage that can be added to any amp, and over that has two impedance matching controls, for a better insertion in the system, it is not so expensive, give it a try if you can....