The Xono can be DC coupled. Mine is that way. Perhaps you can notice the jumpers in this pic (which are open) near the output caps:
As for balanced input, I believe the Ayre P-5xe is. Here's a pic:
Finally, I'd be interested in a schematic for the Klyne phono preamps. They have items encapsulated in little potted enclosures though, so you'd have to bring it into the lab I suppose: