The Kenwood eXcelon X503-1 is a compact high-performance Class-D mono amplifier built to deliver clean, hard-hitting bass while fitting almost anywhere in your vehicle. Engineered for subwoofer applications, the X503-1 produces up to 500 watts RMS at 2 ohms with excellent efficiency, low heat output, and premium sound quality. Featuring adjustable low-pass crossover controls, bass boost, infrasonic filtering, and a wired bass remote, the X503-1 gives you complete control over your low-frequency performance. Its compact chassis and one-sided terminal layout make installation clean and simple for modern audio builds. Features Compact Class-D mono amplifier High-efficiency low-heat design Variable low-pass crossover Variable bass boost control Infrasonic filter for cleaner bass output Wired bass remote included Signal sensing turn-on Speaker-level input compatibility One-sided terminal layout for easier installation CTA-2006 compliant power ratings Specifications Max Power Output: 1000 Watts RMS Power @ 4 Ohms: 300W x 1 RMS Power @ 2 Ohms: 500W x 1 Amplifier Class: Class-D Frequency Response: 20Hz – 200Hz Low Pass Filter: 50Hz – 200Hz Bass Boost: 0–18dB @ 40Hz Infrasonic Filter: 25Hz Signal-to-Noise Ratio: 100dB Fuse Rating: 30A x2 Dimensions: Width: 8-3/8” Height: 2-1/16” Depth: 5-7/8” Weight: Approx. 3.3 lbs