Balanced wiring for Sennhesier 800 S

The Ayre QX-5 uses separate left and right inputs for balanced, so I need a cable with two 1/4" connectors to the QX-5 and two connectors to the Sennheiser 800S, essentially separate left and right cables wrapped together and split out only at the ends.  Where might I find such a cable? 

You can try LavriCables as I think I’ve read they can do custom cables so worth a shot just to see. 

LavriCables can do it.  I made a mistake about the balanced inputs to the QX-5.  They're 3.5 mm, not 1/4".  So I need two cables with male 3.5 mm plugs at one end and Sennheiser 800S connectors at the other.  The cables should be wrapped together except at the ends.  

I may try the unbalanced cable that comes with the 800S before ordering balanced cables.  Ayre offers 3.5 mm and 1/4" unbalanced inputs.  

I have balanced cables with my Sens......I think someone years ago recommended Cardas.......still have them

Check with ZMFheadphones.  They make to order several grades of cables with a variety of connectors.