The In Phase USW10 Ultra Compact Active Underseat Subwoofer is a powerful and compact enclosed subwoofer designed for use in vehicles. With a sleek round shape and a size of 6.5 inches, this subwoofer is perfect for placement in spare wheel recesses, under seats, or in the boot of your car. It boasts an impedance of 4 ohms and an RMS power of 300 watts, delivering deep bass for an enhanced. The black colour and boxed packaging make it a stylish and convenient addition to your in-car entertainment system. See Amazon order pictures for product pictures.