My first impression is that when I switch to the Gumby, the sound is slightly less articulate and shifted to a "thicker" center in the image
Yup, that is what you should be hearing. As you go further up the DAC line, you not only hear more definition, but also a greater sense of 'timing'-Things seem to sound more alive. At least that is what I have found since moving from the Codex to the QB-9 Twenty.
@jjss49 ,
Good points.
I would add- get a good power cord.
John Rutan (audioconnection) sold me on the Audioquest Thunder. It really helped. PM me if you want to try one.
Bob