I'm a bit confussed and hope someone can help . a speaker cable carries ac right ??? then that means my car speakers which has a 12 v dc supply somwere along the aplifier stage its converted to ac ???. To make things more confussing a sound enginner friend of mine said that directionall interconectors are a waste of time becouse ac goes both ways .Now i understand the comment about ac current but as my turntable rca inputs carrry no current atall is it true that its ac runnig through the interconectors ????