Wow, so the cable is backwards. And is there a marking that has an "R" that produces the left channel? Just switch the cables, as long as you don't have preformed ear-hooks? And as you know the plugs have to be in-phase. The other option is switch the R and L inputs if you have a desktop. Also some DAPs let you reverse right and left, but it is rare. Edit: I just read your post again. If it's out of phase, you leave the cables on the same side and flip the connector backwards. That is if they are not preformed ear-hooks. if they were preformed ear-hooks, I would simply replace them with a different cable that had straight cables.