The Sony Xplod XM-604EQX is a 4/3/2-channel Class AB car audio power amplifier released around 2003, featuring 60W x 4 RMS power output at 4 ohms (or 150W x 2 bridged). It includes a built-in EQ, high-pass/low-pass filters, and supports both RCA and speaker-level inputs for versatile 4-channel or subwoofer setups.