Upgrade your car audio with this Rockford Fosgate P300-12T 300W Amplifier 12" Subwoofer Sealed Trunk Enclosure. Enjoy high-quality sound from a single voice coil and a 12in. speaker size that will easily fit in your vehicle. This enclosed powered system is perfect for any car subwoofer enthusiast, delivering loud and clear music without the need for additional equipment. The Rockford Fosgate P300-12T is a top-of-the-line model that will surely impress any audiophile.has small mark on top see pic