The Hertz S 300 S4 is a 12-inch car subwoofer from the Uno series, designed to add deep bass to your vehicle's audio system. It handles a nominal power of 250 W and can reach a maximum of 1000 W, utilizing a ferrite magnet and a voice coil with a 38 mm diameter to deliver consistent performance. The diaphragm is crafted from painted pressed paper pulp using V-cone® technology, which helps maintain structural integrity while keeping the moving mass at 112 g for better responsiveness. With a resonance frequency of 33 Hz and a sensitivity of 89.5 dB, this driver is capable of producing low-frequency tones that feel rich and full. Its physical build includes a special high-density foam suspension and an ABS gasket to ensure a tight, air-leak-free installation in your car. The unit has an overall depth of 128 mm and fits into a baffle cutout of 280 mm, making it versatile enough for those who prefer either a closed box or a bass reflex enclosure depending on whether they want tighter or more booming bass.