Kenwood eXcelon X503-1 1000-Watt Max Class D Mono Subwoofer Amplifier

The Kenwood eXcelon X503-1 is a compact Class D mono amplifier built for buyers who want strong subwoofer power without giving up installation flexibility. Its smaller chassis makes it easier to fit in tighter vehicle spaces while still delivering the clean bass output needed for aftermarket subwoofer systems.

This amplifier is rated at 300 watts RMS x 1 at 4 ohms and 500 watts RMS x 1 at 2 ohms, with a 1000-watt max power rating. Kenwood also equips it with a variable low-pass filter, infrasonic filter, bass boost, speaker-level inputs, and an included wired remote, making it a strong fit for daily-driven systems, stealth installs, and factory-integration builds that need dependable mono sub power.

Key Features

• 1000-watt Class D mono subwoofer amplifier
• 300 watts RMS x 1 at 4 ohms
• 500 watts RMS x 1 at 2 ohms
• Compact eXcelon chassis
• Variable low-pass filter
• Infrasonic filter
• Bass boost
• Speaker-level inputs
• Wired remote included
• 2-year warranty

Connectivity & Integration

• Amplifier type: Mono Class D subwoofer amplifier
• Speaker-level input: Yes, for easier integration with compatible factory or aftermarket source units
• Remote level control: Wired remote included
• Application: Designed for powering a subwoofer or mono bass channel in aftermarket car audio systems
• Install layout: One-side connection design for cleaner wiring and easier installation access

Power & System Control

• 300W x 1 RMS at 4 ohms
• 500W x 1 RMS at 2 ohms
• 1000W max power rating
• Variable low-pass filter for dialing in subwoofer crossover settings
• Infrasonic filter helps reduce unusable ultra-low frequencies
• Bass boost adds low-frequency emphasis when desired
• Compact design works well in builds where space is limited but clean bass output still matters

Installation & Fitment Notes

• Amplifier type: Mono subwoofer amplifier
• Chassis size: Compact footprint for easier mounting in tighter spaces
• Dimensions: 8-3/8" W x 2-1/16" H x 5-7/8" D
• Proper power wire, ground, fuse protection, and speaker load configuration should be confirmed before installation
• This amplifier is intended for subwoofer duty and is not a full-range multi-channel amplifier

Technical Specifications

• Model: X503-1
• Amplifier class: Class D
• Channels: Mono
• RMS power at 4 ohms: 300W x 1
• RMS power at 2 ohms: 500W x 1
• Maximum power: 1000W
• Low-pass filter: Variable
• Infrasonic filter: Yes
• Bass boost: Yes
• Speaker-level inputs: Yes
• Dimensions: 8-3/8" x 2-1/16" x 5-7/8"
• Weight: 3.3 lbs

Identifiers & Packaging

• Manufacturer Part Number (MPN): X503-1
• UPC: 019048240187
• Sold As: Each
• Included Components: X503-1 amplifier, wired remote, speaker-level input harness, installation hardware, and manufacturer-supplied documentation

Why Buy From MCOR Automotive

• Authorized Kenwood retailer
• Experienced with amplifier matching, subwoofer power planning, and clean installation layouts
• Support for choosing the right wiring, subwoofer load, and integration parts for a reliable setup