Even if the UA-1D can convert in the spdif to usb direction (which I'm not 100% certain of, after looking at its somewhat ambiguous description), I still don't think it would work for Karel's purposes.
In the computer interface application it would work by acting as a "guest" or "slave" of the computer's usb "host" controller. But the usb port of a usb-compatible dac is designed to also act as a guest (again with a computer or computer-like device providing the host controller function). So by connecting this converter to a dac via usb, no host controller would be present and the link would not work.
Regards,
-- Al
In the computer interface application it would work by acting as a "guest" or "slave" of the computer's usb "host" controller. But the usb port of a usb-compatible dac is designed to also act as a guest (again with a computer or computer-like device providing the host controller function). So by connecting this converter to a dac via usb, no host controller would be present and the link would not work.
Regards,
-- Al