Benny-x
1000+ Head-Fier
While it might be different from the AK output of say the AK240, I wouldn't say it's "unique", as the Geek TRRS pin-outs match the ReZero standard per an earlier post on the V2+ thread - http://www.head-fi.org/t/765527/lh-labs-geek-out-v2-discussion-thread/240#post_11886238.
I have cables from Luna Shops (a Chinese cable maker you can find online and on eBay) that I've used successfully.
Cheers
It's the HiFiMAN, Oppo PM-3, and Sony style balanced TRRS pin out.
I could only say that it's unique in reference to the volume of A&K players that are out in the wild that have the A&K style TRRS pin out, which is different.
LH Labs using the HiFiMAN style actually sounds more common, I'd you compare the # of brands that use it. It's also, IMO, a better arrangement as you can plug a balanced HiFiMAN style TRRS cable directly into an unbalanced 3.5mm TRS jack and it works fine. It doesn't damage anything, it plays correctly, and it's the right size. I hate the 2.5mm A&K ones...