The KENWOOD eXcelon X303-4 is a compact 4-channel Class D amplifier designed to deliver clean, efficient power for upgraded speaker systems. It produces 50W x4 RMS at 4 ohms, 75W x4 at 2 ohms, or 150W x2 bridged, and features High-Resolution Audio certification, variable high- and low-pass filters, bass boost, speaker-level inputs, signal-sensing turn-on, and convenient one-sided connections.