Regarding your comment about DACs I have not heard the Tambaqui but some of my audio buddies are raving about it, certainly one you should try to audition in your system if you can.
I also own the Zenith Mk3, it was a significant step up coming from an Auralic Aries (G1), in all aspects. How much of an improvement does the Phoenix provide? It's been on my radar for a while, your honest opinion greatly appreciated!
What cable are you using?
Btw GoGo Penguin great choice of music ;)