I just received Senns HD414 and the stock cable is terrible (same plugs as HD650). While I tend to be more objectivist in audio, in this case cable could be the culprit of rather mid-range-y sound.
With whopping 11.5Ohm in resistance and 160pF capacitance over all three terminals, this cable likely measures wrong even in audible range.
Best idea is to design & make your own cables, as you can be sure there's no snake oil anywhere and it's for the best price.
HD414 will get dual twisted pair Van Damme's 22AWGs with silver core, for total price of 10€.