The standard designation is pin 1 to the shell of the RCA and pin 2 to the center tip of the RCA. Leave pin 3 open on digital based gear (your CDP).
On amplifier based gear, use a tiny piece of the same wire as your IC across pins 1 & 3. If you don't have the same wire, use something similar-don't just blob some solder across them.
You can also try leaving the pin open & if you get noise, then put the wire across pins 1 & 3.
Remember, this is the standard pin assignment & some manuf. are different. Sometimes manuf. say which pin in manual, some on gear, some you have to call, etc.
On amplifier based gear, use a tiny piece of the same wire as your IC across pins 1 & 3. If you don't have the same wire, use something similar-don't just blob some solder across them.
You can also try leaving the pin open & if you get noise, then put the wire across pins 1 & 3.
Remember, this is the standard pin assignment & some manuf. are different. Sometimes manuf. say which pin in manual, some on gear, some you have to call, etc.