Good question. When designing and building a sound system for your vehicle, watts and ohms have an important mathematical relationship. This relationship is relevant when deciding how many subwoofers you want and how to power them. In the case of the 8” JBL powered subwoofer it is one sub and it is wired to the amp for you. No need to make those decisions or do the math. All you need to do is provide power to it (a fused link from the battery) and the connection to the back of your deck. Pretty much set it and forget it.
This sub is designed to be the only one you have in your vehicle. It provides a fair amount of bass but it won’t rattle your windows. It definitely has a punch and makes listening to music much more enjoyable. I hope this answers your question.