Btw, just realized I posted the wrong link. You don’t need that box if you are running HPs off speaker taps of a SS amp.Thanks @Palyodgree
I got Moon Audio to make a basic adapter for me with banana plugs on one end and female 4-pin XLR at the other.
You can get one from boutique cable manufacturers as well.
I initially used a DIY version.
Here’s what it looks like: https://www.zynsonix.com/Speaker-Amp-to-Headphone-Converter-Box_p_36.html
You need something like this: https://lqicables.com/products/balanced-xlr-4-pin-female-to-speaker-taps-banana-plugs-pins