18" subwoofers are among the absolute best bass speakers for cars and can produce extremely deep, powerful, and physically palpable bass. With a diameter of approximately 460 mm, they are designed for those who are looking for the extreme and want bass to completely dominate the entire sound system. 18" subwoofers require a large space and a powerful amplifier, but the reward is incredible sound pressure that smaller speakers can never offer. They perform best in spacious bass reflex or bandpass enclosures, where they can show off their power to the fullest. They are the ideal choice for competition installations and for car audio enthusiasts who want to take the sound in their car to the absolute extreme. If you are looking for a bass speaker that you can not only hear but also feel with your whole body, the 18" subwoofer is the clear choice.