The DD540 connects between your digital audio source(s) and your a/v amplifier. The diagram shows typical connections when using two sources.
But my amplifier only has an optical input!
No problem. The DD540 can be configured to transmit the active source on to both outputs simultaneously. This means an a/v amplifier with just one input (optical or coax) can be used with two digital audio sources.
I want to connect an analog (stereo) audio source
Not a problem either. A low cost analog-to-digital converter is all that is needed. Click here for more info.