Ok guys im gonna start off by saying that I am very new to mobile audio. I don't know anything about anything yet. What I do know is that I want to buy an ed k12 sub (only because everyone says their good, I am just following the crowd). They come in single and dual voice coil. What does that mean? Which do I want they are the same price? Will someone please tell me whats the difference? Eventually (way down the line) i want 2 subs (if this makes a differnce in the decisiion?!?) but for now cash is tight and I can only afford one. Any help would be greatly appreciated.