Kenwood Excelon X303-4
4-channel car amplifier — 50 watts RMS x 4
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Kenwood Excelon X303-4 4-Channel Class-D Amplifier
The Kenwood Excelon X303-4 is a high-efficiency 4-channel Class-D amplifier delivering up to 600W max output. Designed for tight, clean amplification of full-range and subwoofer channels, it features compact form factor, shielded output coil, and high-quality components to minimize distortion and noise.
| Key Features | |
|---|---|
| Class | Class-D high-efficiency design |
| Power Output | 600W max total output |
| Shielded Output Coil | Reduces electromagnetic interference & noise |
| High-Quality Components | PMLCAP capacitors in LC filters for low distortion |
| Compact Design | Slim chassis ideal for tight mounting spaces |
| Terminals | Gauge-style screw terminals for secure wiring |
| Bridgeability | Can be bridged for higher power output modes |
| What’s in the Box |
|---|
| 1x Kenwood Excelon X303-4 amplifier |
| 4x Mounting screws |
| 1x Allen wrench (for terminal screws) |
| 1x Owner’s manual & installation guide |
| 1x Warranty card |
| Technical Specifications | |
|---|---|
| Continuous Power | Not specified (see user manual) |
| Max Power | 600W total |
| Signal-to-Noise Ratio | > 100 dB |
| Frequency Response | 10 Hz – 150 kHz |
| Total Harmonic Distortion | < 0.05% |
| Input Sensitivity | 200mV – 4V |
| Impedance | 4–8 Ω (per channel), 2–4 Ω (bridged) |
| Dimensions (W × H × D) | ≈ 5-3/4" × 2-1/8" × 11" (146 × 54 × 280 mm) |
| Mounting Hole Pitch | ≈ 256 mm × 120 mm |
| Cooling | Aluminum heat sink with natural convection |
| Warranty | 2 Years (parts & labor) |
Kenwood Excelon X303-4 X Series 4-Channel 75W RMS x 4 at 2-Ohms, Class-D Car Amplifier
The Kenwood X303-4 is a compact 4-channel amplifier designed to deliver powerful, high-quality sound while fitting seamlessly into your vehicle. With up to 600 watts of maximum output, it enhances your audio system with rich, dynamic bass and clear, distortion-free sound. Adjustable filters and bass controls allow you to customize your audio for a fully immersive listening experience, giving every track precise detail and depth.
Engineered for superior performance, the X303-4 features magnetic-shielded output coils and high-quality PMLCAP capacitors that minimize distortion and enhance low and high frequencies. This ensures crystal-clear, high-resolution sound that goes beyond standard CD quality, making it ideal for audiophiles who demand clarity and depth from their car audio system.
Installation is straightforward and convenient, with gauge-style terminals for secure connections, one-sided terminals for a clean setup, and a 7" speaker-level input harness for seamless integration with factory-installed receivers. Designed with both performance and ease-of-use in mind, the X303-4 provides powerful, reliable sound in a compact, easy-to-install package.
Key Features
– 4-Channel Amplifier with Compact, Space-Saving Design
– Maximum Output Power: 600 Watts
– Adjustable Filters and Bass Control for Customizable Audio
– Magnetic-Shielded Output Coils for Reduced Noise and Enhanced Clarity
– High-Quality PMLCAP Capacitors for Crystal-Clear Sound
– High-Resolution Audio Performance with Rich Low and High Frequencies
– Gauge-Style Terminals and One-Sided Connections for Easy Installation
– Includes 7" Speaker-Level Input Harness, Four 1/2" Screws, Two Allen Keys (4mm & 2.5mm), Warranty Information, and Owner’s Manual
What's Inside?
- 4-Channel amplifier (2 installed 20A mini-ATC fuses)
- 7" Speaker-level input harness
- (4) 1/2" screws
- (2) Allen keys (4mm & 2.5mm)
What Others Are Saying
Eddie was great - SDCS installed a new head unit in my 2019 4Runner. He was honest in his opinions regarding the options I was considering. Pricing was also good - he was able to reuse some of my existing installation kit so I saved a bit of $$.Installation was clean and fast and he took the time to walk through the features before I left. Highly recommend!!
I had a great time at this shop! The staff really knows their stuff and took the time to explain the different options without pressure. Installation was quick, clean and professional. Everything looks factory and sounds amazing. The prices were fair and customer service was above and beyond. I highly recommend this place if you're looking for quality car audio and excellent service.
Those guys are really professional! I had a new Alpine floating head unit installed in my 2008 Mercedes, and it feels like a brand-new car. The installation was super clean. At first, the sound wasn’t the same as the factory stereo, but Kevin tuned it to be just as good—if not better—without adding any new amps. They even used my factory GPS antenna so I don’t have extra wires hanging out. On top of that, they matched the online price. Big thanks to Kevin and Eddie—highly recommended!
Kevin was awesome, he took his time and explained everything to me. I went in initially for a dash cam install and then decided to get a sub and amp installed as well. Both turned out great and will be returning if I need more work done.
Came In not knowing what to expect when suddenly my stereo stopped working. Spoke with Kevin in the front and after a VERY fast diagnosing they discovered my wiring was incorrect. After only about 45 minutes total being in the store I was on my way to the beach with a working stereo again! Thank you so much SDCARSTEREO
Highly recommend Kevin and the team at San Diego Car Stereo for any issues with aftermarket stereos. I bought a car with an aftermarket stereo and AC unit that wasn’t working properly—specifically, the heat wasn’t functioning due to an improper setup. I had several people look at it with no luck, and even the dealership basically refused to help because it was an aftermarket install. I came to Kevin and his team over the holidays feeling pretty defeated, but he was confident he could get the heat working before I headed back to a Colorado winter. Sure enough, he got it done.
FAQ
Do products purchased from San Diego Car Stereo come with a warranty?
Yes, all products come with a 1-year manufacturer warranty unless otherwise stated. This covers any defects excluding physical damage.
Are these products brand new?
Yes, every product we sell is 100% brand new, unused, and comes in original manufacturer packaging unless clearly marked otherwise.
Do you offer installation services?
Yes, we offer professional installation services at both of our San Diego Car Stereo locations. Our expert technicians have over 50 years of combined experience to install all of your car, marine, or offroad audio needs. Stop by or give us a call to schedule an appointment to get a quote in person.