If you need to check your cabling you'll need to know the color coding of the wires. Most Subs use the T568-B standard which is:
Pin 1- White with Orange stripe.
Pin 2- Orange with White stripe.
Pin 3- White with Green stripe.
Pin 4- Blue with White stripe
Pin 5- White with Blue stripe.
Pin 6- Green with White stripe.
Pin 7- White with Brown stripe.
Pin 8- Brown with White stripe.
Here's a link that shows the coding for T-568A and T-568Bhttp://www.duxcw.com/faq/network/diff568ab.htm