hahaha!! That is a good one!

Directional Speaker wire? C'mon, I've never heard sooo much B.S in my life! Speakers run on ALTERNATING power. THAT means the current is continuously changing DIRECTION within the wire!
If it was run DC, then the spaeker would only go in one direction until the polarity is reversed again, which would then be creating AC again.

Go figure. Buy the cheap but soft speaker wire!