Additional Details ------------------------------ Product description: CERWINVEGA MOBILES assortment of awardwinning subwoofers provides the ultimate allinone Bass Solution without taking up any valuable trunk space. The innovative Spare Tire Application Product offerings make for a customfit look for most vehicles. Features. 12 NonAmplified Spare Tire Subwoofer. Solid Non Resonant Die Cast Enclosure Construction. Fits Most Vehicles Without Removing Spare TireSpecifications. Size 12 in.. Nominal Impedance ohms 4 4 ohms. RMS Power Rating 300W RMS. Max Power Rating 600W MAX. Frequency Response 20500Hz. Dimension 14.2 x 5.7 in.