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Memphis Audio MX800.4
Upgrade Your Vehicle With Confidence. This Is Built to Fit, Perform, and Last
Real installer support before and after purchase
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Full Manufacturer 2 Years Warranty
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Ships within 1-3 days
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Memphis Audio MX800.4 Powersports 4-Channel Amplifier
Product Overview:
The Memphis Audio MX800.4 is a compact, high-output Class D amplifier specifically engineered for the demanding environments of powersports, marine, and UTV applications. Despite its small footprint, it delivers a massive 800W RMS total power. Its ultra-durable design features an IP66 rating, making it completely resistant to dust and high-pressure water, ensuring your music keeps playing through mud, rain, or ocean spray.
Key Features
Extreme Weather Protection
Built to survive where standard amplifiers fail, the MX800.4 features conformal-coated circuit boards that protect internal components from moisture and corrosion. The unit is equipped with sealed connectors for power and signal, and the control panel is shielded by a water-resistant top cover, ensuring the sensitive tuning dials remain dry and functional in any weather.
Installer-Friendly "Top-Mount" Controls
In tight powersports installations, accessing side-mounted controls can be nearly impossible. Memphis solved this by placing all crossover and gain controls on the top of the amplifier. This allows you to easily fine-tune the sound even after the unit is mounted in a cramped glove box or under a dash.
Versatile Power Configurations
The MX800.4 is highly flexible, offering 4-channel, 3-channel, or 2-channel (bridged) modes. You can use it to power four high-output speakers at 200W each, or bridge two channels to drive a subwoofer with 400W RMS while the remaining two channels handle your front speakers.
Seamless Integration
Equipped with a 2/4 channel input switch, this amplifier can create a 4-channel output even if your head unit only has a single set of RCA outputs. It also supports both high-level (speaker) and low-level (RCA) inputs, making it compatible with both aftermarket stereos and factory-installed systems.
Technical Specifications
| Category | Specification |
| Power Output (RMS) | 125W x 4 @ 4Ω / 200W x 4 @ 2Ω |
| Bridged Power (RMS) | 400W x 2 @ 4Ω |
| Total RMS Power | 800 Watts |
| Amplifier Class | High-Efficiency Class D |
| Weather Rating | IP66 (Water, Dust, and Element Resistant) |
| Frequency Response | 10Hz – 20kHz |
| THD @ 4Ω | < 1% |
| Input Range | 300mV – 9.7V |
| Recommended Wire | 8-Gauge Power/Ground (8GKIT) |
| Dimensions (L x W x H) | 8.35" x 4.35" x 1.75" |
- Ships within 1–3 business days from our warehouse
- Tracking included with every order
- Free 30-day returns if it doesn’t work for your setup
- 2-year manufacturer warranty
- Authorized dealer guarantee
- Real installer-backed support before and after purchase
Memphis Audio MX800.4
Sale price$419.95
Why This Upgrade Makes Daily Driving Better
Ease of Use & Safety
Hands-free control reduces distraction and frustrationwhile driving.
Expandable by Design
Add backup cameras, better speakers, amps, or subsanytime.
FITMENT & INSTALLATION MADE SIMPLE
WHAT VEHICLES IT WORKS WITH
FIND THE RIGHT PRODUCT FOR YOUR EXACT VEHICLE
We verify compatibility before you buy, no guesswork.
DIY FRIENDLY IF:
- You're comfortable with basic tools
- You follow provided instructions
PROFESSIONAL INSTALL RECOMMENDED IF:
- Your vehicle requires dash kits or wiring adapters
- You want a turnkey experience
INSTALLATION CREDIT & SUPPORT:
- $75 Installation Credit when purchased online
- Speak to real installers before you buy
- Bring it into one of our locations for install
40 Years of Installation Experience
Tens of Thousands of Installs Completed
Authorized Dealer Full Warranties
Why Buying This Here Is Safer Than Anywhere Else
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Physical stores & real installers
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FREQUENTLY ASKED QUESTIONS
FREQUENTLY ASKED QUESTIONS
How do I know this stereo or speaker will fit my car?
Select your year, make, and model using the Vehicle Fit Guide at the top of the page. You’ll only see products that are compatible with your exact vehicle setup.
What happens if I order something that doesn’t fit?
You can return or exchange it within 30 days. We’ll help you identify the correct part for your vehicle so you don’t have to guess again.
Are these products brand new and covered by warranty?
Yes — all products are brand new, authentic, and sold as an authorized dealer, which means they include a full manufacturer warranty.
Can you install this for me, or do I need to do it myself?
You can do either. Install it yourself, or use your $75 installation credit at our shop and have it professionally installed by our team.
What if I don’t know what to choose for my car?
Tell us your vehicle and what you want to improve (sound, bass, CarPlay, etc.). We’ll recommend the exact products that fit your car and your budget.
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