My Trivista came back from repair yesterday, and I hooked it up to my Apple G4 through the HagUSB using a generic USB cable and a Kimber D60 digital interconnect. How did it work? Like a champ. The Trivista still sounds like a Trivista (which is to say, great), but now it has a deeper soundstage, more focused images and close to zero grain.
The HagUSB was easy to set up on my G4. Just plug it into the computers USB port, go to System Preferences, click on Sounds, and select it as the output device.
How does the computer feeding the Trivista through the HagUSB sound compared to the computer feeding the Wavelength Cosecant? Very different. The Trivista has little tiny tubes in it, and the tubes seem to make a little tiny difference (in fact the Trivista sounds a lot like my prior solid state DAC, the Bel Canto DAC2). The Cosecant, on the other hand, is obviously tubed.
The Cosecant really deserves its own review, which I am working on and hope to post in Audiogons review section in the next week or so. That said, here is a quick summary: the Cosecant sounds tubed in both the good way (liquid, holographic ...), and the less good (slightly rolled off frequency extremes, lack of bass punch, a bit of coloration ...). It also presents music in a highly addictive and almost magically real way. So much so that, despite the Trivistas superior dynamics, punch, frequency extension and neutrality, I am having trouble deciding between keeping the Cosecant or Trivista. One will eventually need to go, as I cant afford to keep both; but its a tough call.