The Zu Mobius cable for the 650s is natural, neutral, and balanced sounding; it's very relaxed & smooth & not bright. (Brightness is something to be avoided at all costs with phones, IMHO.) It is much better than the Cardas (I have both.)
Physically, it's a bit stiff, so be sure it's long enough (mine is 10-feet, or maybe 3 meters).
I have not tried the Equinox.
Physically, it's a bit stiff, so be sure it's long enough (mine is 10-feet, or maybe 3 meters).
I have not tried the Equinox.