Name: JL Audio RD400/4
Brand: JL Audio
SKU: rd4004
Price: 377.99 USD
Availability: InStock
Rating: 4.9615 (26 reviews)

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JL Audio RD400/4 Image 1 — JL Audio RD400/4

JL Audio RD400/4 Image 2 — JL Audio RD400/4

JL Audio RD400/4 Image 3 — JL Audio RD400/4

JL Audio RD400/4 Image 4 — JL Audio RD400/4

JL Audio RD400/4 Image 5 — JL Audio RD400/4

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Product highlights

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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$377.99

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Product Highlights

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Description

Authorized dealer

RD400/4

Utilizing JL Audio's exclusive NexD high-speed switching technologies, the ultra-compact RD400/4 amplifier is engineered to deliver loads of audio output power, with incredible efficiency and low distortion. Don’t let its modern styling and small size fool you though, this little powerhouse churns out 100 watts of crystal-clear audio from each of its four channels into 2 ohms (14.4V, 1% THD) and is fully bridgeable, so it can be used as a 3-channel amplifier, or as a 2-channel amplifier producing a whopping 200W x 2 into 4 ohms.

For your convenience, the RD400/4’s controls can be found on top of the amplifier, beneath a protective cover, with all connections located along one side of its chassis. Studio-grade signal processing features include high or low-pass 12 dB / octave filters (defeatable) for each channel pair, with continuously variable frequency selection from 50-500 Hz, and dual-range, differential-balanced inputs capable of accepting most input voltage levels. Automatic turn-on capability (via signal sensing or DC-offset sensing) is standard equipment, along with all-new input type switches for bridging of stereo output channels without needing to use Y-adaptors.

Onboard LED-clipping indicators are also included with your RD400/4. This all-new, innovative feature lets you easily set your amplifier’s input sensitivity settings, quickly and accurately, with no special equipment needed. You’ll also find a set of preamp outputs on-hand, so you can pass signals to another amplifier, almost effortlessly. The RD400/4 features a durable, black powder-coated finish and a top-mounted, dual-color LED light strip that reports the overall status and condition.

Product Details:

RD Series Class D 2 ohm Stable 4-Channel Amplifier
RMS Power Rating:

4 ohm: 75 watts x 4 channel
2 ohm: 100 watts x 4 channel
Bridged: 200 watts x 2 channel @ 4 ohm

Total power output: 400 watts
Blue LED accent lighting
Speaker-level (high-level) inputs (Requires adapter like the JL Audio XD-CLRAIC2-SW)
Signal sensing remote turn-on
Protection Circuitry with Status LED
NextD switching amp technology
Differential-balanced inputs help eliminate noise
Advanced Rollback Protection System prevents thermal shut-down
Input sensitivity:

Low level: 200mV - 2 volts
High level: 800mV - 8 volts

Frequency Response: 12 - 22000 Hz
Total Harmonic Distortion (THD): <1%
Signal to Noise Ratio: >104 dB
Variable high-pass filter: 50 - 500 Hz
Variable low-pass filter: 50 - 500 Hz
Fuse Rating: 40A
4 AWG gauge amplifier wiring kit is recommended for installation
Dimensions: 9.78" L x 6.96" W x 2.13" H
Authorized Internet Dealer
1-year Manufacturer's Warranty
MFR #: RD400/4

Product history:

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

Specifications & Details

Key Features

Amplifier Key Features

Compact Design
Speaker Level Inputs

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

Amplifier Class

Number of Channels

4-Channel

Total RMS Power Output

400 watts

Maximum Input Gauge Size

4 AWG

Minimum Impedance Unbridged

2 ohm

Minimum Impedance Bridged

4 ohms

Frequency Response

12 - 22000 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

>104 dB

Remote bass/level controller

Fuse Rating

40A x 1

Total Fuse Rating

Strappable

Sonic Certified Amplifier

Yes

Amp Bluetooth Connectivity

Hi-Res Certified

Low-Level Input Sensitivity

200mV - 2 volts

High-Level Input Sensitivity

800mV - 8 volts

What is in the box?

Paperwork

User manual
Warranty/Registration card

WITB: Amplifiers

Amplifier
Adhesive brand badge
Allen wrench

Warranty and Return Policy

Parts Warranty Duration

1 year

Labor Warranty Duration

1 year

Warranty Provider

Manufacturer

Customer Ratings & Reviews

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Overall rating distribution

5 star		96%
4 star		4%
3 star		0%
2 star		0%
1 star		0%

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Show only Verified Purchases

By feature average rating

Durability		4.9
Value		4.9
Features		5
Design		5
Usability		5

Customer Photos & Videos

Customer Reviews

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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 Checkmark Icon

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Great Product

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

Cons:None.

By Dustin on February 8, 2018 Checkmark Icon

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Nice

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

By Anonymous on March 30, 2019 Checkmark Icon

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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

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JL Audio Class-D 4-Channel RD400/4

Great prices on great equipment and Fast delivery thanx sonic

By Anonymous on March 6, 2019 Checkmark Icon

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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 Checkmark Icon

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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

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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 Checkmark Icon

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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 Checkmark Icon

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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 Checkmark Icon

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See all 26 reviews

Add-ons

Belva BAK44

Complete 4-Channel CCA 4 Gauge Amp Kit with RCA Cables and Speaker Wire

(60)

$59.99

List price $79.99

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JL Audio RD400/4

$377.99

Product Highlights

Description

RD400/4

Product Details:

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Specifications & Details

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