Ever wonder what was inside that insanely expensive Zu mobius headphone cable. Well, I did and considering that I'm converting my headphone rig over to balanced and wasn't about to shell out the current asking price of ~$400 for a balanced version I decided to do it myself.
Step 1: hack off existing 1/4" plug.
Wow, that's a lot of conductors for a headphone cable. A total of 8 w/ 3 different sizes, all silver plated copper.
Step 2: deal w/ scratchy techflex and something else...
Hmm, evidently this cable is shielded. In fact the shield and the two largest conductors are all tied to ground at the plug. Seems like an awful lot of effort since headphone cables have never been known to pick up noise that I'm aware of.
Step 3: expose a length of wire to work with
At this point I figured which conductors went with which connector and so on. The + signal is carried by two smaller (28 ga) conductors for each channel and the - is carried by a single (24ga) conductor. The two 18ga conductors act as another shield I guess since they aren't tied to the Senn plugs, only the 1/4" plug. Again, pretty odd construction but hey I like the way it sounds so I should really stop complaining.
Step 4: attach new 4-pin XLR
That's it, all done. Well, in truth I made a matching balanced to single ended adapter but that's really boring so I didn't bother taking a picture of it.