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JL Audio JD400/4

400W RMS Class D JD Series 4 Channel Car Amplifier

JL Audio
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• 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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$299.99

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Current Promotions (3 offers)


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JL Audio JD400/4

30% off


Priced separately $817 98

Promo Savings of $155 40

Total price:

$662 58

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JL Audio JD400/4

30% off


Priced separately $419 98

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JL Audio JD400/4

50% off


Priced separately $349 98

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Description


JL Audio brand icon

Authorized dealer

4-Channel Class D Full-Range Amplifier

The JL Audio JD400/4 is a versatile and compact 4-channel amplifier from the JD series, designed to deliver high-fidelity sound with great efficiency. It uses NexD high-speed switching technology to produce clean power while minimizing heat and strain on your vehicle's electrical system. It is fully bridgeable, meaning it can power four speakers, two speakers and a subwoofer, or two high-power speakers.

The JD400/4 is built for both ease of use and professional-level performance. Like other JD models, it features integrated LED clipping indicators around each input sensitivity control. This allows you to set the gain correctly just by watching the lights, ensuring maximum output without distortion. It also features dual-range, differential-balanced inputs to reject electrical noise and accept a wide range of signal levels.

Product Details:

  • JD 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
  • LED Power/Protect Light
  • Speaker-level (high-level) inputs (Requires adapter like the JL Audio XD-CLRAIC2-SW)
  • Input under/over voltage, over temperature, short protection
  • NextD switching amp technology
  • Differential-balanced inputs help eliminate noise
  • Advanced Rollback Protection System prevents thermal shut-down
  • Input sensitivity:
    • Low level: 0.2 - 2 volts
    • High level: 0.8 - 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: 9.50" L x 7.50" W x 2.10" H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty
  • MFR #: JD400/4

Frequently Asked Questions (FAQ)


Red indicates Protection Mode. First, check your ground; it must be to bare chassis metal. Next, ensure your speaker load is not below 2 ohms per channel. If the light stays red with speakers disconnected, check the 40A fuse.
Play a 1kHz test tone at 3/4 volume. Turn the Input Sens. up until the ring around the knob glows Amber, then back it off until the light stays off. This ensures maximum clean power without risking blown speakers.
This happens if "Turn-on Mode" is set to "Signal" or "Offset" but your radio "leaks" voltage. Change the switch to "Remote" and run a dedicated 12V switched wire from your fuse box to the "REM" terminal to fix the battery drain.
Check the "Input Mode" switch. If you only have one pair of RCAs, set it to "2 Ch." so the amp pushes signal to all 4 channels. If you have two pairs of RCAs, set it to "4 Ch." and ensure all cables are seated fully.
Yes. You can bridge Channels 1+2 and 3+4 to get 200W x 2 at 4 ohms. Connect the (+) of your sub to the Ch1 (+) and the (-) to the Ch2 (-). Warning: Never bridge into a 2-ohm load; it will overheat the amp immediately.
This is usually a Ground Loop. Ensure your RCAs are not run next to your main power wire. If the noise persists, re-ground the amp to a different, sanded metal point and ensure the "Input Voltage" switch matches your radio type.
This is Thermal Protection. Ensure the amp has at least 1-2 inches of air clearance. If it's under a seat, ensure carpet isn't blocking the cooling fins. Also, check that your Gain isn't set too high, causing the amp to overwork.
Use a 4-gauge 100% Oxygen-Free Copper (OFC) wiring kit. Using 8-gauge or "CCA" (aluminum) wire will cause voltage drops, which leads to the amp clipping or entering protection mode during high-volume peaks.

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Specifications & Details


Key Features
Amplifier Key Features
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
JD Series
Amplifier Class
D
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
Optional (Requires Accessory Adapter)
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
No
Fuse Rating
40A x 1 
Total Fuse Rating
40
Strappable
No
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
Low-Level Input Sensitivity
0.2 - 2 volts
High-Level Input Sensitivity
0.8 - 8 volts
What is in the box?
Paperwork
User manual
Warranty/Registration card
WITB: Amplifiers
Amplifier
Allen wrenches (2)
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

JD400/4

Weight:

6.00lbs

Internal SKU:

jd4004

Internal Product ID:

178303

Customer Ratings & Reviews


JL Audio JD400/4 thumbnail image

5 star
94%
4 star
0%
3 star
6%
2 star
0%
1 star
0%



Durability
4.9
Value
4.9
Features
4.9
Design
4.9
Usability
5

Customer Photos & Videos


Customer Reviews

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Installed on 2 cars 1994 Miata and 2005 Scion XB

I installed both amp in both cars and the installation was very easy do to great electrical connectors both cars sound is very good using Pioneer double din touch screen head unit. Sound is very clean and has plenty of power both Amos was installed in the back 94 Miata in the trunk and on the 05 Scion XB also in t h e back. I love the quality of the J&L amps would buy again.

By Marco on March 11, 2023 Checkmark Icon Verified purchase

90 found this helpful


Amazing sound!

This amp is phenominal. I am blown away with how well it performs. I believe in name brands when it comes to sound, and J/L hit the nail on the head with this one. I am running two subs bridged in two channel mode and it has a punch. QUALITY like this is meant to be heared. I wonder how great it would sound on my 6x9's. Makes me wish i still had my jl1000/1 to pair it with. Thanks sonicelectronics! You made my day.

By Ethan on August 7, 2021 Checkmark Icon Verified purchase

51 found this helpful


You cannot go wrong with this one.

I had been driving around in my Tundra for 3 years with the stock system. Friend picked my up one day with a proper system installed and I started researching parts the next day. Ended up completely stripping the interior out and upgraded from front to back.
Kenwood DDX9907XR HU, Focal Focal ES 165K components up front, JL coaxes in the rear, JL Audio CS112LG-TW3 Sub powered by a JD500/1 and this amazing little JD400/4 pushing the components and rear fill.
To say I am impressed by this amp is an understatement. JL made setting the gain idiotproof and this will play as loud and clear as my 51 Y/O ears can handle.
Cannot recommend enough.

By Ken on March 3, 2022 Checkmark Icon Verified purchase

49 found this helpful


Awesome Service

Was able to order a rush order and this amp in a breeze... Travis was so friendly and helpful, will highly recommend Sonic Electronix.

By Cody on August 23, 2020

47 found this helpful


JL Audio JD400/4

Clear sound, very pleased.. Easy install, instructions need to be worked on a little..

By Barton on August 10, 2020 Checkmark Icon Verified purchase

46 found this helpful


Unbelievable!!!!!!

JL Audio has always been an awesome brand and even better when you can get it at a great price!!! Thank you Sonic Electronix!!!!

By Eddie on October 6, 2022 Checkmark Icon Verified purchase

45 found this helpful


Very happy!

Paired with my JL C2 650's, this thing rocks! Super easy to install and delivers that JL quality that you know you're always gonna get. For the price, you can't beat this baby!

By Pico on May 23, 2022

45 found this helpful


Looks and Feels Awesome!

Have not installed this amplifier yet, but based on JL's reputation for quality and the look and feel of this amplifier I know it will perform well.

By Roberto on August 3, 2020 Checkmark Icon Verified purchase

48 found this helpful


Nice amp.

Wow! I'm amazed at how this amp got highs & mids sounding crispy and very detailed. I highly recommend this 4 channel amplifier to anyone who looking for one. And the price is very reasonable as well. Two thumbs!!

By Anthony on May 2, 2022 Checkmark Icon Verified purchase

44 found this helpful


Immediate Upgrade!

Buy, buy, buy! You get what you pay for. All 400/4 amps are not the same. JL for the win.

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