The HC-9 is compatible with the newer Hifiman HE4XX runs as well as many Focal designs, Meze 99 Classics (requires longer connector variant) etc. The cable features dual 2 pole TS connectors and terminates to a female 4-pin mini XLR. This is a balanced cable, compatible with our entire interconnect line.
We have two styles available for our headphone cables. Our standard 4.5 ft full length cable, which terminates to our standard female 4-pin mini-XLR. And alternatively we offer an 18" split only version, which can be paired with a 3 ft version of any of our six main interconnect styles.
If you want to pair your headphone cable with our multi-kit, it's best to choose the standard 4.5 ft version, OR add an IC-7 Interconnect extension to your order if you want the split only headphone cable with a multi-kit.
As usual if you'd like a different color, length, specific termination, or our old "standard" low profile heat shrink split, shoot us an email at the custom shop.
I get a lot of emails mentioning that their stock cable for whatever headphone they're buying for comes with TRS connectors, while our listing has mono connectors. Unless you have headphones with "reversible" cables like the Audeze LCD-1, Monolith M560, or the new Rasson Rados, your headphone will be fully compatible with our cable with dual mono connectors. This is the case for Sony, Hifiman, Beyerdynamic, 1more, Focal, Klipsch HP-3 etc.
Now with that being said, our "Long" variant of this cable comes with stereo connectors (to get more length on the connector so it fits the meze 99s). This is wired as such for both Left and Right:
R: Not used
This pinout is compatible with the vast majority of headphones that take a dual 3.5mm cable. However, if you want long connectors like this for your Sony or Beyerdynamic headphones, we'll need to pin them out differently through the custom shop. Or as mentioned before, order the "short" variant and you should be good to go.