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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 car

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

Ships free today

In stock
$229.99

Other options

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

Customer reviews

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JL Audio JD400/4 reviews

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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

Q
Crutchfield asked: Why did you buy this?
A
JL provides good quality sound [ Carldel  Jun 02, 2020 ]
A
Calvin recommended this amp for my door speakers that I had chosen. [ Kyle  May 15, 2020 ]
A
I chose this amplifier mainly due to it's size as well as the value and reliability. [ Robert  Mar 26, 2020 ]
A
fit the needs of my speakers power RMS and fits in the small space i have for my RV. [ Autumn  Mar 08, 2020 ]

3 questions already asked

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.
[ JakefromMaine  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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