The Kicker ZX 300.4 Amplifier is a high-quality car audio amplifier from the well-known brand KICKER. This amplifier, designed for use in vehicles, delivers powerful and clear sound performance. With its compact and efficient design, the Kicker ZX 300.4 Amplifier is perfect for enhancing your car's audio system, providing you with a superior listening experience while on the road. For Parts. Untested. As is