No nothing about subs. need some help

Ok so Im looking around on *********.com and found a 10'' sub with box for what I think is a decent price. What I don't understand is what the difference between a Dual 2 Ohm voice coil- 4 Ohm load and a Dual 4 Ohm voice coil- 2 Ohm load is. Could someone help me out here? thanks

 

http://www.crutchfield.com/S-553BPJILr5V/learn/learningcenter/car/subwoofers_dual.html

 

taco tunes sucks

 

Just a tip...do some searching about ********* before you purchase from them. Don't make the same mistake that I did. Try SuperCrewSound or another company.

 

if you can hold out, sundown is coming out/ has come out with their v3 of shallow mount subs. Get 2 12s and a suited amp. Buy once and install the correct gear. Another option is the SI MAg's