Your Rio Receiver cannot work without a server computer.

It has no built-in software to play music, it *MUST* get software from a server computer when power is applied to it. And as soon as power is lost, the software is gone and it's got to get that software again the next time power is applied.

There are ways to set up a server computer to stream shoutcast streams down to the receiver, working as an intermediary. But you still need that server computer.
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Tony Fabris