Nubert Lautsprecher, HiFi- und Surround-Elektronik

While it was suggested, I'd highly recommend against connecting an RCA connector directly to the jack. You really need at least a level shifter(the signal coming out of the header is 0V/+5V, and coaxial SPDIF is -0.5V/+0.5V), and ideally some isolation. Connecting it directly might work, but is is possible to damage downstream equipment, especially if its SPDIF interface is of lower quality.