The Kicker 46CXA4001 CXA4001 is a high-quality 400-Watt mono class D subwoofer amp designed for car audio systems. Made by the reputable brand KICKER in China, this amplifier delivers powerful RMS power output for enhanced audio performance. With its mono channel design, this amp is perfect for boosting the bass and overall sound quality in your vehicle. Whether you're looking to upgrade your current car audio setup or build a new one from scratch, this used but well-maintained subwoofer amp is a great choice for audiophiles seeking superior sound quality on the go.