Experience powerful bass with the In Phase USW10 Ultra Compact Active Underseat Subwoofer. This round, enclosed active subwoofer is designed to fit in spare wheel recesses, under seats, and boots. With a single voice coil and 2 channels, this subwoofer offers RMS power of 300W and an impedance of 4. The In Phase USW10 is perfect for vehicle enthusiasts who want to upgrade their car’s sound system. Its sleek black design adds a touch of style to any car. This subwoofer comes with a bass box and an amplifier, making it a complete package. Place it on your vehicle’s underseat or in your boot for an immersive audio experience.