There is no better/best cable for the 650s or any other headphone. It all depends on what you want (or ratrher want to change) relative to the stock sound. Now before I go on, realize thatthere are some that belive that cables don't matter at all (composition, sleeving, whatever...). That said, just taking the equinox and the Zu, you have a cable that uses proprietary (Zu makes these) conectors, vs more commonplace connectors that are found on trhe stock cable of the HD600s). The major difference is the wire, silver vs copper, which can yield different presentations of sound. That said again it all depends on what you want and how everything fits together with your system. That said, dpending on what other equipment you have money might be better spent there, as opposed to a headphonecable.
