Specifications: 1) Max. power: 300 W 2) Sensitivity: 92 dB 3) Impedance: 4 ohm 4) Frequency response: 10Hz - 150Hz Description: 1) This car boom box is a sub-woofer with 5.1channel amplifier insde, it\'\'s adopted a serial special circuit design, new style materials and new technology, made its obtained a supreme performance and perfect function. It is aimed the usage of Automobile\'\'s environment, is a practical product which bear on humanization and intelligence. 2) Installed a type which made the inner high charger converted into a low one, both possess automatic switch function, when use this terminal for input, the mainframe will controlled by the Amplifier\'\'s starting up and switch off, thus no necessary to connect with the starting up wire, saved time of installation.What\'\'s more,such 5.1channel has a voice mention function. 3) The external box\'\'s design is suit for the geometry of majority Automobile baggage box size, which takes the advantage of the gladiate of two row seats, thus deduct the space.