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JL Audio  MX280/4

MX Series 4-Channel 70W RMS x 4 at 2 Ohms, Class-D Full-Range Marine Amplifier

Item #46701

Condition:   Brand New

Product Highlights

  • MX Series
  • 4-Channel
  • 70W RMS x 4 at 2 Ohms
  • Class-D
  • Full-Range Marine Amplifier

  Free 2-Years Warranty Included!
60 DAYS Returns Accepted.
FREE Lifetime Tech Support.
FREE Shipping.
60 DAYS Price change protection.

$379.99

Reg. Price $449.99  Save $70.00
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  Free 2-Years Warranty Included!
60 DAYS Returns Accepted.
FREE Lifetime Tech Support.
FREE Shipping.
60 DAYS Price change protection.

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JL Audio MX280/4 MX Series 4-Channel 70W RMS x 4 at 2 Ohms, Class-D Full-Range Marine Amplifier


We are a JL Audio authorized dealer so you get up-to-date, fully warrantied products. Shipping is free to the lower 48 states on everything you order!

What's Inside?
  • • MX Series 4-Channel Class-D Full-Range Marine Amplifier
  • • 4-channel marine amp with 12" pigtails and 35A fuse
  • • (4) Self-tapping screws (1" length)
  • • Spare 35A ATO fuse
  • Owner's Manual

 


Why Choose JL Audio MX280/4 Marine Amplifier?


 

JL Audio MX280/4 Marine Amplifier Right Angle View
Powerful 4-Channel Class D Amplifier for Unmatched Powersports Audio

Elevate your audio experience with this 4-Channel Class D Full-Range Amplifier, delivering 70W x 4 @ 2 Ω or 50W x 4 @ 4 Ω (14.4V). Perfect for motorcycles, ATVs, and utility vehicles, its corrosion-resistant, IPX7-rated cast aluminum chassis ensures durability. With flexible power options of 50W x 4 into 4 ohms or a bridged 140W x 2 into 4 ohms, it’s built for exceptional performance on any adventure.

Versatile Sound Control with Rugged Durability for Any Adventure

Tailor your sound with independent front and rear crossovers for full-range, high-pass, or low-pass filtering, and enjoy versatility with a dual-range input section that accepts both line-level and high-power speaker signals. Built for durability, this amplifier features a rugged powder-coated finish, gasketed control cover, and stainless steel hardware, making it perfect for any adventure.

JL Audio MX280/4 Marine Amplifier Top View
JL Audio MX280/4 Marine Amplifier Bottom View
Unleash Superior Sound with NexD™ Switching Technology

Experience the MX280/4 Amplifier, equipped with NexD™ Switching Technology for exceptional audio quality and efficiency in a compact design. Engineered for powersports, it delivers clean, powerful sound with minimal distortion and rock-solid bass performance, ensuring your audio experience reaches new heights on any adventure.


Frequently Asked Questions (FAQ)


  • • Why does my JL Audio MX280/4 power on but none of my marine speakers produce sound?
    Check the RCA or speaker-level inputs, speaker wiring, and amplifier input mode. A missing audio signal is the most common cause.
  • • Can I bridge the MX280/4 to power two larger speakers?
    Yes. The amplifier supports bridged operation when the connected speaker load meets JL Audio's recommended impedance.
  • • Why does the amplifier go into protection mode after a few minutes on the water?
    This is usually caused by a shorted speaker wire, overheating, or wiring below the minimum impedance.
  • • Can I connect the MX280/4 to a factory marine stereo?
    Yes. It accepts both low-level RCA and high-level speaker inputs for flexible installation.
  • • Why do my rear speakers sound quieter than the front speakers?
    Check the gain controls, fade settings on the source unit, and amplifier input configuration.
  • • Why do I hear engine noise through my speakers when accelerating?
    This is commonly caused by poor grounding or signal cables routed too close to power wiring.
  • • Can I run four 4-ohm marine speakers from the MX280/4?
    Yes. The amplifier is designed to power four full-range speakers efficiently at the recommended impedance.
  • • Why does the amplifier become hot during long boating trips?
    Some heat is normal, but restricted airflow or high-volume playback for extended periods can increase operating temperature.
  • • Can I mount the MX280/4 inside a storage compartment?
    Yes, as long as the compartment stays dry and provides enough ventilation for proper cooling.
  • • Why does the amplifier stay on after I switch off my boat?
    The remote turn-on wire is likely connected to constant battery power instead of a switched accessory circuit.

SPECIFICATIONS


  • Low Frequency Response : 35-300 Hz
  • High Frequency Response : 35-300 Hz
  • Number of Channels : 4
  • Frequency Response : 20-20000 Hz
  • Built In Crossovers : Yes
  • RMS Power Output : 4x70 Watts
  • Channel Separation : Yes
  • Amplifier Class : D
  • Fuse Rating : 1x35 A
  • Promo : Yes

FEATURES


Features:

  • 4-Channel Class D Full-Range Amplifier: 70 W x 4 @ 2 Ω / 50 W x 4 @ 4 Ω (14.4V)
  • Designed for Powersports Applications: Ideal for motorcycles, ATVs, and utility vehicles
  • NexD™ Switching Technology: Delivers clean power without overloading charging systems
  • Corrosion-Resistant Chassis: Compact, cast aluminum design with IPX7 water-resistance rating
  • Flexible Power Configuration: 50 W x 4 into 4 ohms; fully bridgeable to 140 W x 2 into 4 ohms
  • Independent Front and Rear Crossovers: Selectable full-range, high-pass, or low-pass filter controls
  • Dual-Range Input Section: Accepts both line-level and high-power speaker level signals
  • Durable Construction: Features rugged powder-coated finish, gasketed control cover, and stainless steel hardware for long-lasting durability

 

Specifications:

  • RMS Power Output (Watts x Channels): 50 x 4
  • Signal to Noise Ratio: 89 dB
  • Input Voltage: 14.4v
  • Power at 2 Ohms (Watts x Channels): 70 x 4
  • Bridged Power (Watts x Channels): 140 x 2
  • Minimum Impedance Bridged: 4
  • Minimum Impedance Unbridged: 2
  • Amplifier Class: D
  • Low-Pass Crossover Frequency: 35-300 Hz
  • Low-Pass Slope (dB/octave): 12 dB/octave
  • High-Pass Crossover Frequency: 35-300 Hz
  • High-Pass Slope (dB/octave): 12 dB/octave
  • Fuse Rating: 35
  • Speaker Level Inputs: Yes
  • Height (inches): 1-13/16
  • Width (inches): 8-11/16
  • Depth (inches): 3-1/8
  • UPC: 699440984058
  • Weight: 5
  • Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for repair within 1 year from the original date of purchase with proper return authorization.

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Write a review!
  • absolutely what has been missing from my car, this is the perfect fit

    Kamilla
    11/11/2019

  • Great amp for what I needed. space has been one of my issues in my boat and having this is really a huge help. Its got some good power and is able to handle the speakers, so good addition to have. It fits in tight spaces.

    C. Murphy
    6/6/2024

  • perfect for what I've been looking for. thanks JL Audio!

    Joe
    3/12/2025

  • Great amp for the price! Got it installed in my Harley and it didn't even take more than 20 minutes. No problem pushing the speakers to their best sound.

    Prime
    3/20/2025

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