Dave, looking forward to your insight regarding the Emotiva. While it definitely has cut down on my Uber-buzz, it is still there at times... just to a far lesser extent.
EXCEPT... I did find a set of outside flood lights that, when on, definitely makes the Uber buzz a good bit more. The circuit controls two pair of outside CFL floods. Interestingly, whatever this circuit is doing is not at all mitigated by the Emotiva nor the DigiBuss. No idea why it is making the Uber buzz more than usual, but it's easy enough to turn off (these lights are actually rarely used). I have a feeling it is related to the CFL bulbs so I hope to swap them soon to see if that makes a difference.
Strange thing this electricity stuff...