New speaker cables - now audio seems panned right and left

I went from a set of Transparent audio "the wave" to a new set of no-name ribbon cables that are silver over OFC. They cleared a bit of the harshness out of my Vandersteen 2ce's but It seems that the audio now is panned hard right and left. My sound stage is gone... Thoughts? should I give them a break in time or send them back?