The Quicksilver is a great amp. The added cost and complexity is why Mike of Quicksilver prefers not to offer balanced on most of his amps. He will do it on some products but at a significant upcharge.
Conrad Johnson, single ended since day one. I'm pretty sure they have never had XLR on anything.
Call John at Audio Connection in NJ. He sold me mine, at the time he said if I didn't like it I could return it. Having owned other Quicksilver gear I was confident it would be great and it is.

