A:AnswerYou can use it either way but, it also depends how much wattage each channel supplies from your head unit. But you’re aiming for competition loud then I recommend you to use an amp to push these speakers or any speak you prefer.
A:AnswerIt depends on the size of the speaker that fits your door whether it's an oval like these or circular. Yes they come wired, all you have to do is wire and play.
