That is silly. Directionality of a cable is determined from a few purposely defined characteristics. I hate to say this and sound rude...but the quality control must be lacking if you experience an obvious difference. There is absolutely NO reason why a well designed cable would do this. Now if the plugs are the only difference as you state, then possibly this would be more of a hint as to what may be causing the difference.
11-05-09: Vandermeulen
AQ quote from the 1990s
"While cable directionality is not fully understood, it is clear that the molecular structure of drawn metal is unsymmetrical, which does provide a physical explanation for the existence of directionality."
Bob Crump
>http://db.audioasylum.com/cgi/m.mpl?forum=cables&n=12332&highlight=rcrump+wire+direction
http://www.stereophile.com/features/368/index8.html Quote from article
"The revelation that digital interconnects and their direction can introduce large differences in measured jitter was quite a shock. The differences heard between digital interconnects—and in their directionality—have now been substantiated by measurement.".
