250mm amplified subwoofer in die-cast metal ideal for installation under the seats, equipped with self-ignition. Remote control included in the package. Features Extra-flat 250 mm diameter speaker Inputs with low and high sensitivity Low pass crossover adjustable from 50 to 150 Hz Signal to noise ratio 60 dB Impedance: 4 Ohm Frequency range: 20-500Hz Phase selector  0° - 180° Max Power: 600W Rated power: 300W Size: 340x260x68mm Weight: about 5 Kg