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JL Audio M400/4

400W Peak Marine M Series 4-Channel Class D Full-Range Amplifier

JL Audio
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• 400W RMS
• Preamp RCA outputs
• 3-Way System Protection Circuitry
• Variable High/Low-Pass Filter
• Remote Bass Level Input
• Total Amplifier Efficiencies Exceed 80%

Learn more about the m4004

We apologize

This item has been discontinued

Product Highlights


• 400W RMS
• Preamp RCA outputs
• 3-Way System Protection Circuitry
• Variable High/Low-Pass Filter
• Remote Bass Level Input
• Total Amplifier Efficiencies Exceed 80%

Description


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Authorized dealer


JL Audio M400/4 - M Series 4-Channel Class D Full-Range Amplifier

This potent 4-Channel amplifier employs JL Audio's high-speed NexD™ switching design to achieve unprecedented efficiency and amazing power output in an ultra-compact chassis. Don't let the small size fool you, though... this amplifier is capable of serious power, delivering a full 400W of continuous total power into a 2 ohm load (14.4V, 1% THD). Targeted specifically for an audiophile-grade system, the M400/4 includes a variable mode low-pass/high-pass filter with a continuously variable cutoff frequency selection from 50-500 Hz. With the M400/4, you have lots of great options.

With the addition of an HD-RLC remote level control (sold separately), you can control the volume of one, two or all three channel pairs of the M400/4 from the front of the vehicle or boat. This amplifier features white and gray powder-coat finishes, a gasketed cover for the controls and stainless steel hardware for durability in the marine environment.

Advanced Rollback Protection

JL Audio's signature Advanced Thermal Rollback protection system eliminates annoying thermal shutdown events to keep the music playing, even under the most demanding conditions. Should the amplifier reach an unsafe operating temperature, a special circuit rolls back peak power output, without changing gain, until the amplifier cools down to a safe operating temperature. The red "Thermal" LED will light to indicate this condition has been reached. Once the amplifier cools down, the circuit restores full peak power output and the red "Thermal" indicator reverts to its normal state. The operation of Advanced Rollback Protection is inaudible in most cases.


NexD™ Switching Technology

From the same minds that gave us the technology found in the 'Slash' amplifiers, JL Audio has taken the simple fixed PWM design approach and enhanced it with a very high switching frequency. Full-range NexD™ amplifiers and channels feature a variable, ultra-high speed version of the NexD™ technology (switching at well over 400 kHz). In these designs, a self-oscillating modulator with "feed-forward" sends information about the instantaneous power supply voltage to the modulator, combining this with the input signal to cancel out any distortion due to supply voltage fluctuation. This reduces distortion prior to applying feedback, simplifying the overall feedback loop design.



Product Features

  • M Series 4-Channel Class D Amplifier
  • RMS Power Rating (14.4V):
    • 4 ohms: 75 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • Bridged, 8 ohms: 150 watts x 2 chan.
    • Bridged, 4 ohms: 200 watts x 2 chan.
  • RMS Power Rating (12.5V):
    • 4 ohms: 60 watts x 4 chan.
    • 2 ohms: 90 watts x 4 chan.
    • Bridged, 8 ohms: 120 watts x 2 chan.
    • Bridged, 4 ohms: 180 watts x 2 chan.
  • NexD technology features unsurpassed efficiency
  • Pulse Width Modulated MOSFET power supply
  • Remote bass level input (JL Audio HD-RLC required and sold separately)
  • LED power (green) and protect (red) indicators
  • Soft Start Turn-on
  • 4/3/2 channel operation
  • Total amplifier efficiencies exceed 80%
  • Advanced Thermal Rollback System completely eliminates annoying thermal shut-down events
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-Way System Protection circuitry (thermal, overload, and speaker short protection)
  • Studio-grade signal processing with fully variable crossover filters
  • Differential input circuitry effectively combats alternator whine and other noises created by boat systems
  • Heavy duty aluminum alloy heatsink for extreme heat dissipation
  • Silver-plated RCA level inputs
  • Silver-plated screw terminals
  • Input sensitivity:
    • Level: 100mV-4V
  • Variable high-pass filter: (50-500 Hz, 12 dB/octave Butterworth)
  • Variable low-pass filter: (50-500 Hz, 12 dB/octave Butterworth)
  • Damping factor: >150 @ 4 ohms per chan./50 Hz
  • Frequency response: 12-22,000 Hz
  • Dimensions: 8-1/2"L x 7-1/8"W x 2-1/16"H
  • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • Authorized Internet Dealer
  • 1-year Sonic Electronix Warranty

JL Audio M400/4 owner’s manual

Product history:

JL Audio M400/4 thumbnail
(newest, current model)
JL Audio M4500 thumbnail
(previous model, replaced by JL Audio M400/4)

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
RMS Power @ 1 ohm
Not Stable
Bridged RMS Power
200 watts x 2 channel
Amplifier Specifications
Series
M 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 ohms
Minimum Impedance Bridged
4 ohms
Frequency Response
20 - 20,000 Hz
THD at Rated RMS Power
1.0%
Speaker Level Inputs
No
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Full (AP)
High-Pass Crossover Frequency
50 - 500 Hz
Low-Pass Crossover Frequency
50 - 500 Hz
Signal-to-Noise Ratio
>104 dB
Remote bass/level controller
Optional (Accessory required and sold separately)
Fuse Rating
40A x 1 
Strappable
No
Sonic Certified Amplifier
No
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
What is in the box?
Paperwork
User manual
WITB: Amplifiers
Amplifier
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Item Details


Manufacturer:

Model Number:

M400/4

Weight:

5.50lbs

Internal SKU:

m4004

Internal Product ID:

26965

Product and How-to Videos


Customer Ratings & Reviews



5 star
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
4.8
Features
5
Design
5
Usability
5

Customer Reviews

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Sounds great

Extremely easy hook up and sounds great. small enough to fit perfectly behind back seat in my 06 Silverado extended cab

By Mike on August 13, 2012

32

found this helpful.

Works great on motorcycles too!!

I purchased this amp to go into a Harley Davidson Street Glide. (In the faring) it was highly recommended by others, great sound and value!

By Streetglide2013 on March 21, 2014

26

found this helpful.

Great Amp

I use this to power 2 JL Audio 7.7's and a 10" sub on my golf cart. Works great. It is mounted in the engine compartment, open to the elements and I've had no problems.

By Club Car on March 28, 2013

28

found this helpful.

JL M400/4

I had this professionally installed on my 22 Pathfinder. It made a world of difference with 4 JL 7.7 speakers!

By JEM on June 3, 2016

10

found this helpful.

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