Instead of trying to match a subwoofer to a box, let the experts do the heavy lifting with these Pioneer enclosed car subwoofers. They have a component subwoofer pre-mounted for optimal sound and accuracy. You can get sealed box subwoofers for precise bass, ported enclosures to bring the thunder and bandpass boxes for the most slam. Active enclosed subwoofers have a built-in dedicated amplifier to further simplify setups. OnlineCarStereo.com carries them all with free shipping in the lower 48 states.