I've had my 4508 for about a week now (upgraded from a 2020), and I'm really enjoying the new features, but I have a question. My stereo has an digital audio input, but the connector looks like an RCA input, different from the output port on the back of the RTV... Is there a cable available that will allow me to connect these together? I've only seen cables with one or the other style of connecter, not both....