Shure e.530s. I've never had anything plugged into the input. Its always just been used as a dac/amp from my laptop and/or desktop. I should try that sometime, I didnt think of that. Cables = whatever USB cable I have lying around for the desktop, or the short USB cable that I requested with the Pico. And the headphones. And in this case, the Pico is the source, since I have the dac/amp model.