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JL Audio JD400/4

JD Series 4-channel car amplifier — 75 watts RMS x 4

Item # 13698361

We think JL Audio's JD Series amplifiers will provide tremendous performance and value for our customers.

Find what Fits your vehicle

We think JL Audio's JD Series amplifiers will provide tremendous performance and value for our customers.

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About the JL Audio JD400/4

Power up your music

JL Audio's JX Series amplifiers were very popular with our customers, garnishing rave reviews citing their tremendous performance and value. We think their latest JD Series amps will follow in their footsteps, offering superior power and serious features for your dollar. The JD400/4 four-channel amplifier will send 75 watts RMS to each of your front and rear speakers, guaranteeing you'll hear and feel your music clearly over road and engine noise. JL Audio designed this amp to power high-performance speakers like their premium C3 and C5 Series components. If you're just looking to fill your ride with bass, you can configure this amp for two-channel operation in order to power a pair of subwoofers with up to 200 watts RMS each.

Power up your music

JL Audio's JX Series amplifiers were very popular with our customers, garnishing rave reviews citing their tremendous performance and value. We think their latest JD Series amps will follow in their footsteps, offering superior power and serious features for your dollar. The JD400/4 four-channel amplifier will send 75 watts RMS to each of your front and rear speakers, guaranteeing you'll hear and feel your music clearly over road and engine noise. JL Audio designed this amp to power high-performance speakers like their premium C3 and C5 Series components. If you're just looking to fill your ride with bass, you can configure this amp for two-channel operation in order to power a pair of subwoofers with up to 200 watts RMS each.

Convenient features

Variable high- and low-pass filters allow you to tune the amplifier to match your particular speaker or subwoofer system. The amp includes speaker-level inputs with signal-sensing amp turn-on, along with preamp inputs and outputs, so it's ready to work in virtually any system. Differential-balanced inputs plus JL Audio's NexD™ amp technology keep the signal sounding pure and noise-free at all times.

JL Audio JD400/4

JD400/4 connection and control panel

READ LESS

Product highlights:

  • 4-channel car amplifier
    • 75 watts RMS x 4 at 4 ohms
    • 100 watts RMS x 4 at 2 ohms
    • 200 watts RMS x 2 bridged at 4 ohms (4-ohm stable when bridged)
  • full-range Class D amp design with NexD™ switching technology
  • frequency response: 12-22,000 Hz
  • variable low- and high-pass filter (50-500 Hz, 12 dB/octave)
More Info:
  • preamp inputs and outputs
    • differential-balanced inputs prevent noise
  • speaker-level input via speaker wire-to-RCA adapters
    • signal-sensing turn-on with speaker-level inputs
  • wiring, fuse, and hardware not included with amplifier
    • 4-gauge power and ground leads and a 40-amp fuse recommended
  • 9-7/8"W x 2-1/8"H x 7-1/2"D
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # 98361

What's in the box:

  • 4-Channel amplifier
  • 2.5mm Hex key
  • 3mm Hex key
  • Owner's manual

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JL Audio JD400/4 reviews

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More details on the JL Audio JD400/4

Mark G.

Product Research

Features

Overview: The JL Audio JD400/4 is a 4-channel full-range Class D amplifier. It's effectively two full range 2-channel amps built into one chassis (labeled CH. 1&2 and CH. 3&4). Each section of the amp is bridgeable, so it can be wired as 4-channel, 3-channel, or 2-channel.

Amplifier Power Ratings:

  • At 14.4 volts: 20 Hz-20 kHz, <1% THD+N
    • 4Ω: 75 watts RMS x 4
    • 2Ω: 100 watts RMS x 4
    • Bridged 4Ω: 200 watts RMS x 2
  • At 12.5 volts: 20 Hz-20 kHz, <1% THD+N
    • 4Ω: 60 watts RMS x 4
    • 2Ω: 90 watts RMS x 4
    • Bridged 4Ω: 180 watts RMS x 2

Clipping LED: Using a sine-wave test tone (50 Hz for a subwoofer or 1 kHz for full range speakers) recorded at 0 dB reference level (not included), the clipping LED helps you set the gain control to the maximum unclipped level.

Crossovers: Each 2-channel section of the amplifier has an independent 12dB/octave crossover; each can be set to high-pass, low-pass, or off (full range). The crossover points are independently variable from 50 Hz to 500 Hz.

Protection Circuitry: The JD400/4's protection circuitry automatically turns the amplifier off if thermal limits are exceeded, a short circuit is detected in the speaker wiring, or the input voltage drops below 11 volts.

Controls:

  • Input Sensitivity: rotary controls (independent for each 2-channel section); used to match your source unit's output voltage to the input stage of the amplifier for maximum clean output; the range of the dial depends on how the Input Voltage switch is set
  • Input Voltage: 2-position switch:
    • Low: input sensitivity control (gain) range is 200mV-2V; used with the preamp output of typical aftermarket radios
    • High: input sensitivity control (gain) range is 800mV-8V; used with speaker level outputs and high output preamps
  • Crossover Mode: 3-position switches (independent for each 2-channel section):
    • Off: crossover is bypassed
    • HP: High-Pass
    • LP: Low-Pass
  • Crossover Frequency: rotary controls (independent for each 2-channel section); continuously variable from 50-500 Hz
  • Turn-on Mode: 3-position switch:
    • Remote: use when the source unit has a +12 volt remote turn-on wire (preferred method)
    • Offset: the amp reads a small DC signal typical on the speaker level output of factory radios (senses the offset on the channel 1 input)
    • Signal: detects a midrange speaker level signal on the input; turns off after approximately 30 with no signal
  • Input Mode: 2-position switch; set to the number of inputs used:
    • 2 Channel: in 2-channel mode the signal on the channel 1&2 inputs feeds all four output channels
    • 4 Channel: each output channel has a dedicated input

Connections:

  • Power: The power, ground, and remote turn-on connections are set-screw terminals:
    • Power and Ground: accept up to 4-gauge wire (4-gauge minimum recommended); the included 3mm hex key is used to tighten/loosen the set-screws
    • Remote Turn-on: accepts up to 10-gauge wire (18-gauge minimum recommended); the included 2.5mm hex key is used to tighten/loosen the set-screw
Note: The amplifier is not equipped with a fuse. An external 40-amp fuse (not included) must be installed on the power wire. If a wiring kit is used which includes a fuse with a value other than 40-amps, the original should be replaced with a 40-amp fuse.
  • Speaker Output Terminals: The speaker outputs are set-screw terminals. They accept up to 8-gauge wire (16-gauge minimum recommended). The included 2.5mm hex key is used to tighten/loosen the set-screws.
  • Signal Inputs: Two pair of stereo RCA input jacks accept either preamp or speaker level signals. When connecting speaker level signals, a speaker wire to RCA adapter is useful.
  • Preamp Outputs: The stereo RCA preamp outputs pass the signal connected to the channel 1&2 inputs, so another amplifier can be added easily. The output is not affected by the JD400/4's gain or crossover controls. The preamp output signal is buffered to prevent noise.

Note: When the input voltage switch is set to Low, the voltage of the RCA output matches the input; when set to High, the output voltage is attenuated -12 dB.

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Customer Q&A

25 questions already asked

Q
Does the pre out option mean you can connect it to another amp for subs?
[ Orlando  Jan 22, 2023 ]
1 answer
A
Greetings Orlando, and thank you for your question. Yes sir, the pre out on the JL Audio JD400/4 is to send signal to another amplifier, either a sub amp, or a two channel full range amp.
[ Thomas J.  Jan 22, 2023 ]  Staff
Q
Going to remove currently installed kicker 4 channel amp for a JL. Will it be a simple wire for wire exchange?
[ Danny T  Nov 10, 2022 ]
2 answers
A
Should be a simpke wire for wire exchange. I have already replaced my JL with a more powerful amp and it was a simple exchange.
[ Steven  Nov 10, 2022 ]
A
There's a possibility this will be an easy swap with the Kicker, it just depends on how the amp is connected. This amp requires at least a 4-gauge power and ground leads and a 40-amp fuse is recommended. It does have preamp inputs if you're using rca's to connect this to your radio or line output converter.
[ Allison  Nov 10, 2022 ]  Staff
Q
Can this amp power 4 JL C2-600x? I'm also new to installing speakers and amps so what all would I need in terms of the wires?
[ Carson  Sep 08, 2022 ]
1 answer
A
The JD400/4 is an ideal match for the JL Audio C2-600X speakers. 4-gauge power and ground leads and a 40-amp fuse is recommended.
[ Jenny  Sep 08, 2022 ]  Staff
Q
DSR-1 feeding this amp. Gave up on the Rockford side, if I understand correctly then I'm just using the Maestro. If I am understanding correctly further (further correctly?) then the Maestro is feeding the amp 4 volts to the inputs? Right now the powered sub is coming off thee DSR-1. Once I gave up on the Rockford side, the sub is MUCH quieter. Would I do better switching the sub to the amp pre-outs? I don't understand how much it would be attenuated. Could I be making my situation worse?
[ Todd Edel  Aug 02, 2022 ]
2 answers
A
Thank you Arielle. I'll try to find a minute tomorrow to call.
[ Todd Edel  Aug 03, 2022 ]
A
You are right that you are getting 4 volts to the inputs but as far as making your situation worse or not, this would actually be something to better discuss over the phone with one of our advisors. If you could give us a call at 800.324.9695 they can go into more detail about your set up.
[ Arielle  Aug 03, 2022 ]  Staff
Q
Can this amp be installed vertically?
[ nikhil  Aug 01, 2022 ]
1 answer
A
Yes it can be mounted vertically.
[ Arielle  Aug 01, 2022 ]  Staff
Q
I have a single JL Audio 10TW3-D4 subwoofer. I was wondering how much power a single channel from the JD400/4 could use. I was hoping to supply 400 amps to the single speaker off of the JL amp. Is that possible? If not how much can I expect to pull from one channel?
[ Zack  Jul 18, 2022 ]
1 answer
A
If you wired your subwoofer in parallel you would get 100 watts RMS off of a single channel off of that amplifier which would be at the 2 ohm load. That is the most power you could get off any single channel in any configuration.
[ Arielle  Jul 18, 2022 ]  Staff
Q
Will this amp fit in a 2015 road glide fairing?
[ Mike  Jul 07, 2022 ]
1 answer
A
We won't be able to confirm any fit there sadly Mike, as the JL JD400/4 is a custom install item. What I CAN say is that having seen the inside of your fairing, this amp is a little beefy and I think it would be a tough fit. I'd consider this JL MX500/4 in it's place. It's marine rated, and a little smaller, we have had customers successful custom mounting inside the Road Glide fairing. https://www.crutchfield.com/p_13698408/JL-Audio-MX500-4.html
[ Bo  Jul 07, 2022 ]  Staff
Q
I have 4 speakers connected to this amp all 4ohm. Is it possible to run another 4 speakers 4 ohm as well and having 2 tweeters connected? They are all 400watt max speakers
[ CHAPITO  Jun 27, 2022 ]
1 answer
A
Technically you could connect a total of 8 speakers to this amp, 2 speaker per channel. When that is done it will reduce the impedance to 2 ohms. When two 4 ohm speakers are connected to the same channel they need to be wired in parallel to get the 2 ohm impedance. Once the impedance drops to 2 ohms the amplifier will output more power. At 2 ohms this amp will output 100 watts rms meaning each speaker will receive 50 watts rms each. Also, you will not have the ability to fade the speakers when connected this way.
[ Allison  Jun 27, 2022 ]  Staff
Q
I have 6 speakers in my 2015 Camry(2 in rear,2 in dash, 2 in doors) will this amp work for my whole system?
[ Al  Mar 06, 2022 ]
1 answer
A
This amp is a 4 way. It has connection for 4 speakers. Unless you have front crossovers that split the signal to two speakers from a single input this will not work.
[ Steven  Mar 08, 2022 ]
Q
Could I use 8 gauge wire to power and ground this? If so how much of a difference would it make vs a 4 gauge
[ Pedro  Feb 24, 2022 ]
3 answers
A
I googled 8 gauge and it should handle 40 amps. Not sure if it would want to try it though for safety reasons it could get warm and heat up burning the wire insulation and not blow the fuse. Lowest I would try would be 6 gauge. JL recommends 4 gauge and I use 4 gauge also. I have this amp and it is fabulous. I run 2 ohm speakers front and rear crossed over at 80 hz. handles it fine doesn't shut off or heat up too bad One thing I hate about JL amps and a few other is the lack of a built in fuse on their amps. It is a hassle to put fuse in between the amp and junction box (takes up lots of space. Many manufacturers add built in replaceable fuse located on the amp itself which is much easier for installs
[ Jim  Feb 25, 2022 ]
A
You can use what you want but I would follow the recommendations in the manual of the amp. I would personally use what the amp calls for or bigger which is what I did. The bigger the wire, in my opinion, will give you better results. Also make sure you have a good ground.
[ BENNY  Feb 25, 2022 ]
A
8 gauge would be fine in my opinion. Wiring this with 4 gauge is not going to provide any real discernible difference.
[ MiniCooperR52  Feb 24, 2022 ]
Q
Is there a wiring diagram for running this amp bridged for a set of components?
[ Greg  Dec 28, 2021 ]
1 answer
A
There are basic diagrams in the documentation, but JL's website is a great resource - their Facebook group has weekly instructional videos as well. Hope that helps.
[ Michael  Dec 28, 2021 ]
Q
I am thinking about getting this for my 1993 GMC Sierra k 1500 pickup. I was wondering what stereo would both fit in the dash, and be compatible with this amp? Any help is appreciated.
[ Dominic  Nov 04, 2021 ]
1 answer
A
For additional details on fit, installation, and compatability, please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you more details on what you will need for an installation in your vehicle.
[ Kenny  Nov 06, 2021 ]  Staff
Q
Hello everyone. Quick question. I bought 4 6.5 JBL GTO 629 car speakers for my 2014 Chevy Cruze what would be a good amp for them? I was thinking about the JL audio JD400
[ Victor  Sep 06, 2021 ]
2 answers
A
The JL audio JD 400 is an excellent app I'm running something very similar to what you have
[ DONNY R  Sep 07, 2021 ]
A
The only issue with that would be that these speakers have a max rms of 60 @3 ohms while the jd400/4 has a output of 75rms @4 ohms so the amp will put out more power than your speakers can handle. Otherwise, in regards to quality of the amp, I own one and love it. I have it on 6x9 infinity speakers in my truck and it fills up the large cab with sound even with the windows down. The quality of the sound is very good. Music is crisp and clear without the highs screeching at you. My mom rode in my truck the other day and said she could hear things in songs that she's never heard before. She drives a 2018 Chevy with a Bose speaker system.
[ JACOB  Sep 06, 2021 ]
Q
Can you can this amp as a 3ch amp ?
[ Kiran  Aug 28, 2021 ]
1 answer
A
Yes although I'm in 4ch mode, great amp for the money for sure
[ benjamin  Aug 28, 2021 ]
Q
So you don't need a LOC with this correct? Just tap into the speaker wires behind the receiver and run it straight to the amp?
[ Travis  May 25, 2021 ]
2 answers
A
I have no idea
[ DUWAYNE  May 26, 2021 ]
A
Yes I believe that to be true. Nice amp and does a great job.
[ Raymond G  May 25, 2021 ]
Q
had this installed in promaster van with Alpine R-S65C.2 R-Series 6-1/2" component speaker system and 8" sub , behind seat , can I add 2 more speakers in rear of van using this amp?
[ kengood  May 02, 2021 ]
3 answers
A
I don't think so I personally won't be using this amp for a subwoofer
[ DONNY R  May 17, 2021 ]
A
probably not. The JL Audio is a 4 channel amp. You are already using it for 2 components and one output for the sub making 3 outputs. I would recommend hooking up the 4 component speakers to it and purchasing a dedicated subwoofer amplifier
[ Jim  May 17, 2021 ]
A
Not sure if I understand the question but this is a 4 "speaker" amp or it ran bridged it's a 2 speaker amp
[ Chris  May 02, 2021 ]
Q
This amp can power an pair Focal PS 165 (80w RMS) and a pair Focal 165 AC (60w RMS), or do I need an amp more powerful?
[ Luis  Jan 19, 2021 ]
1 answer
A
Thanks for your question. For information on selecting the best amp I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system.
[ Krissy  Feb 01, 2021 ]  Staff
Q
This amp can power an pair Focal PS 165 (80w RMS) and a pair Focal 165 AC (60w RMS), or do I need an amp more powerful?
[ Luis  Jan 18, 2021 ]
2 answers
A
Im running 2 JL 12w3's in a ported box. Way more power than i need. Very loud and low distortion. Its only a 2 channel amp thow. Class D ( subwoofer amp )
[ Joe  Feb 04, 2021 ]
A
the Focals are rated at 60 wpc RMS @ 4 ohms the amp is 75 wpc RMS at 4 ohms X 4 (RMS). Looks like a great matchup. I use this amp to power 4 Infinity 60 CSX. They are 2.5 ohms and handle 100 watts RMS and amp will handle 100 watts at 2 ohms so again good match. Buy the amp it is a nice deal. Only thing I don't like about this amp is they cheaped out and did not put an attached fuse to the chassis so you will have to add your own but it is compact. Also they have some special way to set the gains but did not give a cd. I did not have luck setting my gain with JBL unit so set head unit @ 30 (40 max) and set the gain this way by experimenting.
[ Jim  Jan 19, 2021 ]
Q
Can I use this amp in my boat?
[ Todd  Jan 13, 2021 ]
2 answers
A
Yes, try to keep it away from any possible water ingress, but mine is powering 4 6.5" wetsounds in the cabin of my boat
[ Ronnie  Jan 14, 2021 ]
A
This amp is not a marine amp but might work well if you keep it away from outdoor environment by installing it in the boat's cabin.
[ Guest  Jan 13, 2021 ]
Q
What wiring kit will I need to have this installed under my Toyota Tacoma seat, and supply power to 4 Kicker C-class door speakers?
[ Marshall  Oct 23, 2020 ]
1 answer
A
This amp needs a 4 gauge power wiring kit and works best with 14 gauge speaker wire going to the speakers. Audio input cables will be needed and those will vary depending on the radio its connected to. I recommend contacting an advisor by calling 1-800-324-9695 to get a personal recommendation on all the parts to complete the install into your system
[ Paul  Nov 22, 2020 ]  Staff
Q
can i install 2 of these amps with one 4 gauge wire running to battery? 4 gauge seems like an overkill. My old vehicle I had about 4 or 5 amps running with 4 gauge Welding cable and never had an issues.
[ Jim  May 04, 2020 ]
3 answers
A
I have the JD400/4 and JD1000/1 on one 4 gauge wire connected to a 2-way distribution block.
[ ERWIN  May 04, 2020 ]
A
both amps recommend 4 gauge power and ground wire. You can use 4 gauge from the battery but I recommend 0 gauge to a distribution block then 2 4 gauge wires 1 for each amp so your not starving the amps for power
[ Ryan  May 04, 2020 ]
A
You should be able to run two of these with 4 gauge from the battery to a fused distribution block, then an 8 gauge to each amp. I'm just wrapping up an install with this and a 600w mono amp, 4 gauge from the battery, then 8 gauge to each amp.
[ Andy  May 04, 2020 ]
Q
can i install 2 of these amps with one 4 gauge wire connected to battery?
[ Jim  May 04, 2020 ]
3 answers
A
Yes you could depending how far the amps are from the battery ( check out amplifier wire gauge chart on Crutchfield) with a 80 amp fuse 6 to 8 inches from the battery to a distribution block then 2 4 gauge wires with 2 40 amp fuses 1 fuse and wire for each amp. But I recommend a 0 gauge wire from the battery. I used 0 gauge wire with a 70 amp fuse from the battery to the distribution block with a 4 gauge wire and 40 amp fuse to my jd 400/4 for my kicker ks components. And a 8 gauge wire and 30 amp fuse to my jd 250/1 for my jl 8w3v3-4 sub.
[ Ryan  May 04, 2020 ]
A
You need to look at a wiring guide to determine. https://www.crutchfield.com/S-EkEuN7g9HO2/learn/learningcenter/car/cable_gauge_chart.html . It looks like it should be fine though. Each JL pulls 40 amps, so 5 gauge should be fine. You'll need an 80 amp fuse near the battery and a fused distribution block near the JLs, each with a 40 amp fuse.
[ Graham  May 04, 2020 ]
A
Short answer is yes. However it depends on many variables. I would check here https://www.crutchfield.com/S-ESxUjTZ2VMc/learn/learningcenter/car/cable_gauge_chart.html to determine if it is safe to do so. Ideally you would want a bigger feed wire then break out to two smaller cables via block distribution.
[ B.  May 04, 2020 ]
Q
Is the listed signal to noise ratio of 104 db an error? This seems significantly higher than any of the other amplifiers and is higher than JL's premium lineup.
[ Jake from Maine  Feb 28, 2020 ]
2 answers
A
The 104 db number is at the highest rated power output. JL has the signal to noise listed at 84 db at 1 watt.
[ Cosmo  Apr 07, 2020 ]  Staff
A
I can only say I am very satisfied with the sound quality of the amp. Zero noise complaints
[ benjamin  Apr 01, 2020 ]
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