If you love bass-heavy music, then a car subwoofer is a great investment. It will boost lows in a serious way. Power output for 18” car subwoofers range from 300 to 7,500 watts at maximum power, though most fall within the range of 600 to 2,500 watts. The higher the watts, the more likely you’ll feel physical vibrations when cranking the volume up. Keep in mind that 18” car subwoofers are large and require more power than a smaller unit. They can also take up more space in the car. They have a larger cone than many are used to, which will produce a deeper bass sound. The cone material should be as resistant to tears and damage as possible. Some 18” car subwoofers need to warm up for a few minutes before they’ll provide the deep bass you’re looking for.