The difference between a good sub-woofer and a cheap sub-woofer are obvious. A premium sub-woofer creates a deep and encompassing bass that you don't only hear but feel, creating good vibrations for you and every single person in your car. A cheap sub-woofer merely shakes your car and windows like an earthquake, creating a crusty and rusty sound that is cacophonous to the ear and uncomfortable to anyone unlucky enough to be a witness to this catastrophe. Car R us only carries top of the line sub-woofers at affordable prices, making sure you have crisp and clear car audio. We have expert installation and great customer service, ready to answer any and all questions you have about your bass blasting sub-woofer and car audio.