I'd like to find out if using twisted pair wiring will really yield much of a difference in noise rejection in both speaker wiring and rca wires in the car environment. I would think it would be more important in the RCA's since they are carrying a low voltage signal, and any noise introduced ithat makes it to the amplifier is a bad thing. But do they make an audible difference or am I paying for a gimmicky sales pitch...especially for speaker wire...?

 

Speaker wire, you won't hear it. Line level you won't either unless the other equipment in your car is truly horrible, or you are using an amp with balanced signal inputs.



ETA: http://www.installer.com/tech/index.php?page=cat5