TESTED WORKING! The Rockford Fosgate Power P4004 4 Channel Amp is a high-quality car amplifier designed by the reputable brand, Rockford Fosgate. With 4 channels and a power output of 400 PLUS watts, this amplifier is capable of delivering clear and powerful sound for your car audio system. Whether you're looking to upgrade your current setup or build a new one from scratch, the Rockford Fosgate Power P4004 4 Channel Amp is a reliable choice for audio enthusiasts seeking premium performance.