Hifiman Sundara - DIY Balanced Cable Wiring Help!

As I understand, balanced cables basically just mean the left and right drivers have separate ground? So how come the driver 3.5mm jacks have 3 poles? Are the spare third poles redundant?

Does the wiring below for a 2.5mm TRRS jack correct?

The third band is redundant. All the balanced cables I’ve seen for Hifiman use mono 3.5mm TS for the cans and then pinout to match the source device (2.5mm or XLR).

TRS tips are probably cheaper and why they are used.

And welcome to the forums!

yep that’s what really confused me when I received them. And thanks! Hope to lurk around here more :slight_smile: