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JL Audio  RD400/4

RD Series 4-Channel 100W RMS x 4 at 2 Ohms, Class-D Full-Range Car Amplifier

Item #45871

Condition:   Brand New

Product Highlights

  • RD Series
  • 4-Channel
  • 100W RMS x 4 at 2 Ohms
  • Class-D
  • Full-Range Car 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 $439.99  Save $60.00
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  Free 2-Years Warranty Included!
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60 DAYS Price change protection.

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JL Audio RD400/4 RD Series 4-Channel 100W RMS x 4 at 2 Ohms, Class-D Full-Range Car 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?
  • • 4-Channel amplifier
  • • 2.5 mm Allen-wrench
  • • Self-adhesive JL Audio badge
  • Owner's Manual

 


Why Choose JL Audio RD400/4 4-Channel Amplifier?


 

 

JL Audio RD400/4 4-Channel Amplifier Top View
Unleash the Power of NexD™ High-Speed Switching Technology

Harness the power of our revolutionary NexD™ High-Speed Switching Technology with the RD400/4 amplifier, delivering 100W x 4 at 2Ω and 75W x 4 at 4Ω with incredible efficiency, ultra-low distortion, and crystal-clear audio, all packed into a sleek, compact design that redefines performance.

Bridgeable Channels, Easy Access, and Professional-Grade Sound Tuning

Transform your audio setup with the RD400/4’s versatile bridgeable channels, allowing you to configure it as a powerful 3-channel or 2-channel amplifier (200W x 2 @ 4Ω). Enjoy easy access to top-mounted controls under a protective cover, streamlined connections all on one side, and studio-grade signal processing with high/low-pass filters and adjustable frequency selection for precise, professional-grade sound customization.

JL Audio RD400/4 4-Channel Amplifier Outer Chassis Right Angled View with Control Cover Closed
JL Audio RD400/4 4-Channel Amplifier Side Connection and Interface Panel Full Frontal View
Seamless Versatility and Convenience

Enjoy unparalleled versatility with the RD400/4 amplifier's dual-range differential-balanced inputs, which accommodate a wide range of input voltage levels, along with automatic turn-on capability for seamless signal or DC-offset sensing. Plus, with innovative input type switches, you can easily bridge stereo outputs without the need for cumbersome Y-adaptors, simplifying your setup and enhancing your audio experience.

Enhanced Performance and Durability for Your Audio Experience

Experience effortless audio management with the RD400/4 amplifier’s onboard LED-clipping indicators, allowing for easy and precise input sensitivity adjustments. With preamp outputs for seamless signal pass-through to additional amplifiers, a durable black powder-coated finish for lasting performance, and a stylish dual-color LED light strip that clearly indicates amplifier status, this amplifier is designed to elevate your audio setup to new heights.

JL Audio RD400/4 4-Channel Amplifier Side Connection Panel Right Angled View

 


Frequently Asked Questions (FAQ)


  • • Why does the amplifier keep dropping into protect mode and showing a red light during heavy volume?
    This is usually caused by low voltage supply or a short circuit. Check your ground connection to bare chassis metal, and ensure your speaker wires aren't touching or shorting against the vehicle frame.
  • • Why is the LED ring surrounding the gain knob flashing red when the bass hits?
    The built-in NexD clipping indicator flashes red to warn you that the audio signal is distorting. Turn the input gain control down immediately until the light stops flashing to protect your speakers from blowing.
  • • Why do I hear a high-pitched whining noise that matches my car's engine speed?
    This is engine alternator whine, caused by a ground loop. Ensure your amplifier ground wire is short and secure, and route your RCA signal cables far away from the main factory power lines.
  • • Can I safely bridge this 4-channel amplifier to run a single subwoofer?
    Yes. You can bridge channels 3 and 4 together to push 200W RMS into a single 4-ohm subwoofer, while keeping channels 1 and 2 running your standard front door speakers.
  • • Why won't the amplifier turn on when using the automatic signal-sensing feature?
    The automatic DC-Offset or Signal-Sensing modes require a strong factory speaker wire signal. If your stock radio outputs too low a voltage, switch the toggle to "REM" and run a physical 12V remote turn-on wire.
  • • Why does the amplifier run burning hot to the touch under my passenger seat?
    While NexD Class D technology is highly efficient, mounting the amplifier flat on carpet or in a tight space blocks airflow. Mount it with small spacers or in a ventilated area to allow heat dissipation.
  • • Why do my speakers sound hollow, completely muffled, or lack mid-bass punch?
    Your crossover switches are likely misconfigured. Ensure the filter switches are set to "HPF" (High-Pass) for standard door speakers, and dial the crossover frequency knob to roughly 80Hz.
  • • Why isn't my optional RBC-1 bass knob controlling the volume of my front speakers?
    The optional remote bass controller port on the RD400/4 is hardwired to adjust the output level of channels 3 and 4 only. It will not alter the volume of channels 1 and 2.

SPECIFICATIONS


  • Number of Channels : 4
  • Frequency Response : 12-22000 Hz
  • Amplifier Class : D
  • Fuse Rating : 40 A
  • Promo : Yes

FEATURES


Features:

  • High-Power Output: 100W x 4 @ 2Ω / 75W x 4 @ 4Ω (14.4V, 1% THD)
  • NexD™ High-Speed Switching Technology: Efficient performance with low distortion
  • Compact Design: Small and modern, yet highly powerful
  • Bridgeable Channels: Can be configured as a 3-channel or 2-channel amplifier (200W x 2 @ 4Ω)
  • Top-Mounted Controls: Easy access to controls beneath a protective cover
  • All Connections on One Side: Streamlined for neat installation
  • Studio-Grade Signal Processing: High/low-pass 12 dB per octave filters (defeatable), variable frequency selection (50-500 Hz)
  • Dual-Range Differential-Balanced Inputs: Accepts a wide range of input voltage levels
  • Automatic Turn-On Capability: Signal sensing or DC-offset sensing
  • New Input Type Switches: Allows stereo output bridging without Y-adaptors
  • Onboard LED-Clipping Indicators: For easy and accurate input sensitivity settings
  • Preamp Outputs: Simplifies signal pass-through to additional amplifiers
  • Durable Construction: Black powder-coated finish for longevity
  • Dual-Color LED Light Strip: Top-mounted strip indicates amplifier status and condition

 

Specifications:

  • RMS Power Output (Watts x Channels): 75 x 4
  • Peak Power Output (Watts x Channels): N/A
  • Power at 2 Ohms (Watts x Channels): 100 x 4
  • Bridged Power (Watts x Channels): 200 x 2
  • Minimum Impedance Bridged: 4
  • Minimum Impedance Unbridged: 2
  • Minimum Impedance: 2
  • Best Frequency Response: 12-22k Hz
  • THD at Rated RMS Power: 1%
  • Signal to Noise Ratio: 84 dB
  • Input Voltage: 14.4v
  • UPC: 699440986212
  • Weight: 8
  • 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.

Do you own this product?

Write a review!
  • Excellent product, as all JL Audio equipment is. Powering a set of Wet Sounds 8” Wakeboard tower speakers and performance is great, and to JL standards. I recommend this Product. NOTE: I will be buying a set of JL Wakeboard Tower Speakers in the near future.

    Danny
    5/4/2022

  • I was in the process of doing an update on my car audio system. I started with the sub amp and thought I needed this amp here to match. This thing powers my Infinity Kappas just right! Nice and crisp, no distortion. Highly impressed compared to my old JX400/1 amp. Highly recommend this amp.

    Brian Soto
    2/18/2023

  • JL Audio sound is top-notch, no doubt. Swapped out my old JL amp for this one. Paired it up with my 2-way Kickers, and they're sounding awesome. Crystal clear and powerful. Thinking I might go for JL speakers soon too.

    Gabby
    11/29/2023

  • Nice looking amp. Sound is crystal clear and powerful. Its size is not that small but still easy to install. Controls are handy, and it makes easy to tune to get the best out of the amp and the speakers.

    Pierre
    3/5/2024

  • Excellent well balanced, great priced amp. Very happy with purchase.

    Robert Bruno
    4/29/2024
free installation

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