Somehow I can't get over the idea the DacPort wouldn't work right. There must be a fix, to get a better impedance match or something. It's a good idea to track it down with the manufacturer, since it may prevent other problems in the future.
I finally checked out some of the tracks you listed, especially Butch Clancy. If I had any doubts about the 1840's bass the tracks on Youtube settled that. Awesome bass! I might have mentioned this already, but for some interesting sonics and great overall music, I got the soundtrack to Le Voyage Dans La Lune by Air, and I think I've played the whole thing at least 30 times. If there was ever a good reason to get a good headphone, that album answers the question.