JL Audio RD400/4

400W RMS RD-Series NexD 4-Channel Class-D Amplifier

JL Audio
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• 75 Watts RMS x 4 @ 4 ohms
• 100 Watts RMS x 4 @ 2 ohms
• Total Peak Power: 800 Watts
• Variable Bass Boost: 0 to +12 dB bass boost at 45 Hz
• Heavy duty aluminum alloy heat-sink
• 7"W x 9-3/16"L x 2-1/8"H

Learn more about the rd4004
Was $399.99 Details
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$379.99

 with warranty

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Current Promotions (1 offer)


Purchase a qualifying amplifier and save 50% on an NVX XKIT44 True Gauge OFC amplifier installation kit. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

JL Audio RD400/4

50% off


Priced separately $489 98

Promo Savings of $55 00

Total price:

$434 98

Product Highlights


• 75 Watts RMS x 4 @ 4 ohms
• 100 Watts RMS x 4 @ 2 ohms
• Total Peak Power: 800 Watts
• Variable Bass Boost: 0 to +12 dB bass boost at 45 Hz
• Heavy duty aluminum alloy heat-sink
• 7"W x 9-3/16"L x 2-1/8"H

Description


JL Audio

Authorized dealer

General Features:

  • JL Audio RD-Series RD400/4
  • Class-D 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohms: 75 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • 1 ohm: ------------N/A------------
    • Bridged, 4 ohms: 200 watts x 2 chan
  • Total power output: 800 watts
  • NexD™ Technology delivers outstanding sound quality, efficiency and reliability
  • LED clipping indicators
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Soft start turn-on
  • DC Offset-Sensing and Signal-Sensing (auto-on)
    • Designed for high-level (speaker level) signals, not for lowlevel (preamp level) signals.
    • The circuit senses the input signal from CH. 1 only.
  • Mono channel operation
  • Speaker-level (high-level) inputs
  • Bridging switch for each channel pair
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Dual speaker terminals simplify the hookup of multiple speakers
  • Heavy duty aluminum alloy heat-sink for extreme heat dissipation
  • Input sensitivity:
    • Low level: 200mV - 2V
    • High level: 800mV - 8V
  • Frequency Response: 12 - 22,000Hz
  • Total Harmonic Distortion (THD): <1%
  • Variable low-pass filter: 50 - 500 Hz, 12 dB/octave
  • Variable high-pass filter: 50 - 500 Hz, 12 dB/octave
  • Low-Pass Slope (dB/octave): 12 dB/octave
  • Variable Bass Boost: 0 to +12 dB bass boost at 45 Hz
  • Fuse Rating: 40 A x 1
  • 4-8 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier. Click Here for our contact information.
  • Dimensions: 7"W x 9-3/16"L x 2-1/8"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Check out the JL Audio Class-D 4-Channel RD400/4 Owner's Manual

Product history:

JL Audio RD400/4 thumbnail
(newest, current model)
JL Audio JX400/4D thumbnail
(previous model, replaced by JL Audio RD400/4)
JL Audio JX360/4 thumbnail
(previous model, replaced by JL Audio JX400/4D)

Specifications & Details


Power Specifications - Full Range Channels
RMS Power @ 4 ohms
75 watts x 4 channel
RMS Power @ 2 ohms
100 watts x 4 channel
Bridged RMS Power
200 watts x 2 channel
Amplifier Specifications
Series
RD Series
Marine Certified
No
Amplifier Class
D
Number of Channels
4
Total Peak Power Output
800 watts
Total RMS Power Output
400 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
4 ohms
Frequency Response
12 - 22,000 Hz
THD at Rated RMS Power
<1%
Speaker Level Inputs
Yes
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
High-Pass Crossover Frequency
50 - 500 Hz
Low-Pass Crossover Frequency
50 - 500 Hz
Signal-to-Noise Ratio
84 dB
Channel Separation
12 dB
Bass Boost
0 - 12 dB
Remote bass/level controller
Optional (Accessory required and sold separately)
Fan Cooled
No
Fuse Rating
40A x 1 
Total Fuse Rating
40
Strappable
No
CEA-2031 Compliant
No
Sonic Certified Amplifier
Not Tested
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
What is in the box?
Paperwork
User manual
WITB: Amplifiers
Amplifier
Other Accessory #6
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

RD400/4

Weight:

6.35lbs

Internal SKU:

rd4004

Internal Product ID:

107621

Product and How-to Videos


  • JL Audio RD Series Car Amplifiers | Clipping LED Demonstration | CES 2017
  • JL Audio RD Amplifier Product Spotlight
  • How To Install an Amplifier: Car Amplifier Basics Part 2

Customer Ratings & Reviews



5 star
93%
4 star
7%
3 star
0%
2 star
0%
1 star
0%



Durability
4.9
Value
4.8
Features
5
Design
5
Usability
5
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Great Deal on a great product

I could not be happier with this amp. True quality from top to bottom. The sound is fantastic. I used this as a full range four channel amp to drive four kicker speakers. It gets its signal from the factory Nissan HU which is a very low quality HU in my opinion. I decided to try to keep the factory HU due to the factory steering wheel controls, bluetooth and stock look for theft deterrent appearance. I found the front channels on the HU clipped out way early compared to the rear when setting up the amp. So i switched the amp to 2 channel input / four channel output the set it up with the clip lights ....and perfection! What a great feature. I am very happy.

By Gerry on March 16, 2017 checkmarkIcon Verified purchase

9

found this helpful.

JL Audio Class-D 4-Channel RD400/4

Great prices on great equipment and Fast delivery thanx sonic

By Anonymous on March 6, 2019 checkmarkIcon Verified purchase

4

found this helpful.

Great Product

Pros: Easy to install, all the needed features, underrated.

Cons:None.

By Dustin on February 8, 2018 checkmarkIcon Verified purchase

4

found this helpful.

Open box saved me $70

JL lives up to their reputation again. Replaced my kicker 4 channel with this amp. A smaller footprint operates at a cooler temperature, and all of the wirings is on one side for cleaner wire installation.

By Christopher on January 24, 2021 checkmarkIcon Verified purchase

3

found this helpful.

Excellent app at a great price. Fast delivery also!

I needed the amp I bought quickly and Sonic Electronix was the only company that had it in stock and at the right price.

Great amp, shipped fast. 100% satisfied.

By David on August 7, 2020 checkmarkIcon Verified purchase

3

found this helpful.

Nice

Very good sound quality amp and small enough to put under the seats

By Anonymous on March 30, 2019 checkmarkIcon Verified purchase

3

found this helpful.

JL Audio Class-D 4-Channel RD400/4

I would recommend this amp it sounds so clean!!!! I have it running 4 6.5 Phoenix gold coaxal speakers I have had this amp for 6 months and works perfectly.

By Anonymous on December 14, 2018

3

found this helpful.

Amp

Very pleased so far.. sounds just as my amp that I replaced.. easily installed, with a very small space required for installation... don't know about durability yet.. but we will see.. for the $$ and power/size ratio I would recommend this amp to anybody.. JL makes some of the best

By Marc on September 24, 2017

3

found this helpful.

Sounds good for the money

Using this in conjunction with an RD1500 in a regular cab Silverado. Not yet installed but it is running on my test bench on a set of Kicker's bookshelf demo speakers. Good, clean sound and plenty of power while running in 2 channel mode.

Shipping and customer service experience was not what I expected; both were slower than promised. Product is great.

By Ryan on November 24, 2021 checkmarkIcon Verified purchase

2

found this helpful.

Excellent price Great power

This amp was a great price and I love the convenience in size. I replaced my factory amp and the Boston acoustic speakers now sound like high-end audio. Very easy to install and with the new clipping feature I have no issues. Will be buying another soon.

By Christopher on March 19, 2020 checkmarkIcon Verified purchase

2

found this helpful.

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