Edition XS headphone side 3.5mm jack wiring help

I'm building a custom cable for my HIFIMAN Edition XS and need to confirm the wiring for the 3.5mm TRS connectors that plug into the earcups. Specifically, I need to know what connections the Tip, Sleeve, and Ring are used for (wether +, unused, and -, or possibly +, -, and ground, I just don't know). Can anyone with experience building Edition XS cables confirm the correct wiring diagram? Thanks in advance.