[chrislangley4253]

I'm going to mod a pair of lower end Grado's. I intend to put off switching out the cable for some time. Therefore, I'd like to know how the cables actually compare. I know that Grado claims on their website that the SR80i's have a 4 pin. What exactly does that mean?
 
P.S. Please don't comment unless you have owned both and or are sure of what you know.