How to connect Stax adapter srd-7 to amplifier

Hello - I have just unearthed my Stax Lamda-Pro phones and the Stax adapter srd-7 - but I no longer have a clue which of the wires colored white, black,red, and green attaches to which amplifier output post. - can you shed any
light on this for me? Simple system - old NAD 7130 receiver, the usual turntable (AR), cd player(NAD) etc. Thanks. Robert Carr