Thanks these cables look great!
Still a bit confused with the balanced cable variables though.
So if you have a TRRS fitted to one of these double helix cables, does that offer any benefit as the HD650 still remains an unbalanced headphone.
So if that is the case, does the TRRS plug make the Double helix cable a balanced cable suitable for balanced mode on the HM901 or will I get the same kind of performance from a normal "Unbalanced" cable such as the Moon Audio Silver Dragon V3? which really does sound like a worthy investment.
Any headphone can be driven balanced as long as you can access the two connectors on each driver. You then just need four conductors/cables to the plug. Unbalanced cables has four conductors to the Y-split where the two ground conductors are soldered into one.