I just purchased a lightening audio subwoofer system so i can put it in my room. I thought i knew how to install it but it came with a 1 page instruction manual with little detail. I have a car battery in my room and everything needed but i dont know how to install it and get it running properly, my main concern is the battery. How do i connect the battery correctly to the amplifer. If someone can plz help me i would surelly apriciate it..