The Harmony Audio HA-A400.4 Car Amp is a powerful 4 channel speaker sub amplifier designed for car audio systems. With a full range design and an impressive 800W RMS power output, this amplifier delivers clear and crisp sound quality for a fully immersive listening experience. Featuring the brand's reputation for quality and performance, the HA-A400.4 is a top choice for car audio enthusiasts looking to enhance their sound system.