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JL Audio JX360/4

4-channel car amplifier — 70 watts RMS x 4

9 Reviews | 3 questions - 5 answers

Item # 136JX3604

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Our take on the JL Audio JX360/4

You know you're holding a serious piece of sound equipment when you feel the heft of a JX amp. JL Audio designed these amplifiers with sturdy, high-grade parts that ensure excellent heat management, provide high current flow, and deliver stable performance in almost any situation. You won't find blinking lights or meters on the outside of these amps, but you will find oversized output transistors and rugged MOSFET power supplies inside. The sleek, high-mass aluminum heatsink keeps things cool enough to virtually eliminate thermal shut-downs.

You know you're holding a serious piece of sound equipment when you feel the heft of a JX amp. JL Audio designed these amplifiers with sturdy, high-grade parts that ensure excellent heat management, provide high current flow, and deliver stable performance in almost any situation. You won't find blinking lights or meters on the outside of these amps, but you will find oversized output transistors and rugged MOSFET power supplies inside. The sleek, high-mass aluminum heatsink keeps things cool enough to virtually eliminate thermal shut-downs.

The JX360/4 4-channel amp delivers 70 watts RMS per channel to your front and rear speakers, and it's a great match for high-quality component speakers. You can also switch over to 2-channel mode, and power a pair of subs with 180 watts RMS each. Use the variable low-pass filter and bass boost to tune the amp to your subwoofer system. The amp includes speaker-level inputs, along with preamp inputs and outputs, so it's ready to work in virtually any system.

Product Highlights:

  • 4-channel car amplifier
  • 70 watts RMS x 4 at 4 ohms (90 watts RMS x 4 at 2 ohms)
  • 180 watts RMS x 2 at 4 ohms
  • Class AB amplifier design
  • MOSFET switching power supply
  • frequency response: 20-20K Hz
  • variable high- and low-pass filter (50-200 Hz, 12 dB/octave)
  • preamp inputs and outputs
  • speaker-level inputs
  • 4-gauge power and ground leads and a 50-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 50-amp in-line fuse between the distribution block and the amplifier is recommended
  • 16"W x 2-3/16"H x 7-11/16"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's in the Box:

  • 4-Channel full-range amplifier
  • Two 10" Speaker-level harnesses
  • 4 Mounting screws
  • 4 Flat washers
  • Hex-key
  • Owner's Manual

JL Audio JX360/4 Reviews

Average Customer Review(s):

(9 Reviews)

nice power

rico from Spring TX on 3/8/2015

Crutchfield Customer Review (What's this?)

nice upgrade to any vehicle

Pros: lots of power



raiderdom from California on 1/25/2015

Crutchfield Customer Review (What's this?)

Great looking, clean functional power. More than I expected




Seth from Monroe,NC on 8/4/2014

Great amp I knew this amp would be good but when I hooked it up I had engine noise bad.Then I remembered I ran the rca and power wire's on the same side my mistake that's a big no no.Luckily I was able to tune the amp and get rid of the noise just turned down the gain and offset the volume on my head unit.JL saved me again I sure didn't want to have to rip the wire's back out.sounds great!

Pros: Reliable flexibility does what it is supposed to

Cons: Size could be smaller

clean sound

Pony RN from Surprise, AZ on 4/29/2014

Crutchfield Customer Review (What's this?)

The amp delivers great clean sound throughout the sound spectrum. I installed it in my car that has high performance loud exhaust. This amp still provides the level of volume and quality of sound I require. Great product for most any application. It looks great mounted on the backs of my seats as well.

Pros: Great value. Great sound. Cool looking.

Cons: None

JL Audio JX360/4

Anonymous from Holly springs nc on 2/5/2014

Crutchfield Customer Review (What's this?)

Great amp!

Pros: Easy to install!


Couldn't ask for any more!

Addison from Miami Beach, FL on 11/21/2013

Crutchfield Customer Review (What's this?)

What an amplifier. This will be the third amplifier I have replaced with a JL one, I could not be happier! JL's product is literally second to none. With all the settings available and the power to push any speaker, this is the best choice for a 4-channel amp.

Pros: Easy to use! Many variable settings (HPF, LPF, input level...)

Cons: None.

great amp for price

kurtis from pa on 5/18/2013

Have it in a full size bronco running 4 alpine type r plays loud and clear

Pros: Works great cheap amp

Cons: It could be smaller


Mustang Dan from dracut mass on 7/4/2012

All i can say is wow and wow if i could give it more than a 5i i would I was kinda turn off by the price seem kinda low for a good amp but the amp is great cant ask for more the price is very low for what you get cant ask for more does JL make anything that isnt top of the line? i think not

Pros: $$$$ loud clean

Cons: JL audio never has cons they dont sell something if it isnt great

Excellent Amp from an Excellent Brand

Skirmich from San Diego, CA on 7/3/2011

This amp was bought to mate with a JL SLASH 500/1v2 and WoW what an Awesome System! Incredible sound and Loud very very Loud with ZERO Distortion. POS: -Aluminium Heatsink -Built Quality (Impressive) -Independent HPF & FQs -Clear + Zero Distortion Sound -4 AWG Power Cables and Grounds CON: -A little Large -No 24db/oc < But not Important for my Setup. -Price a bit Steep but you Can Find better Prices if You Look Right... NOTE: If you care for adjust the Gains from the Manual just make Sure you dont go Beyond 16v output + Adjustments (Bass Boost, Etc.) it Will go into Protect in 20 minutes with a Moderate Volume. (Im Sitting at 14.80v Fronts and 15v Backs) and I can crank the volume all the way +3/4 without clipping or distortion and its so Loud I cant hear a person sitting besides me...




Hands-on research

Product Research



Four-channel Class A/B Amplifier: The JL Audio JX360/4 is a four-channel, full-range (20-20,000Hz) audio amplifier utilizing Class A/B technology. The JX360/4 can be operated with a wide variety of source units (aftermarket or factory) and system configurations (4-channel, 3-channel, 2-channel, or mono).

MOSFET Switching Power Supply: The JL Audio JX series four-channel amplifier employs a rugged MOSFET power supply for outstanding reliability and operational stability.

Amplifier Ratings:

JX360/4 Amplifier Specifications Channels Watts Ohms Frequency Response Signal-to-Noise THD
Rated Continuous (RMS) Power @ 14.4V 4 70 4 20-20,000 Hz 80 dB 1%
4 90 2 20-20,000 Hz 80 dB 1%
2 (bridged) 180 4 20-20,000 Hz 80 dB 1%
Rated Continuous (RMS) Power @ 12.5V 4 55 4 20-20,000 Hz 80 dB 1%
4 80 2 20-20,000 Hz 80 dB 1%
160 4 20-20,000 Hz 80 dB 1%

High-Mass Heat Sink: A heavy extruded aluminum heat sink is designed to keep the JL Audio JX series amplifier in a comfortable thermal range during demanding operation. This high-mass, extruded heat sink removes heat from the amplifier circuitry, extending high-power operation. This improves reliability and reduces the frequency of thermally related shut-down event.

Protection Circuitry: The JX360/4's protection circuitry automatically shuts the amplifier down if thermal limits are exceeded, a short-circuit is detected in the speaker wiring, or if low supply voltage limits are reached.

Status Indicator Lights: There are two status indicator lights on the right side of the amplifier.

  • Power (Green): This LED lights green to indicate that the amplifier is turned on and operating normally.
  • Protect (Red): The Protection LED lights Red to indicate the amplifier's protection circuitry has been activated to prevent product failure due to thermal overload, a short-circuit, or a dangerously low impedance connected to the amplifier's outputs.


Input Sensitivity: The four-channel amplifier's Input Sensitivity Control is used to match your source unit's output voltage to the input stage of the amplifier for maximum clean output. The JX360/4 is equipped with an independent Input Sensitivity Control for the Front (1/2) & Rear (3/4) channels.

  • Low-Level Input Range: 200mV-4V (RMS)
  • High-Level Input Range: 2V-10V (RMS)

Input Mode: This switch allows operation of all four amplifier channels with only one pair of input signals (2-CH Input Mode) or with independent front and rear input signal pairs (4-CH Input Mode).

Note: You will only need to connect the front RCA inputs when placing the amplifier in 2-CH input mode.

Variable Crossover: The variable filter design employed in the JX360/4's crossover section allows you to switch filter modes and change filter frequencies for the amplifier's Front (1/2) & Rear (3/4) channels. The JX360/4 offers the following crossover adjustments along the amp's side-panel.

  • Filter Mode: The amplifier allows you to select either a Low Pass, High Pass or Full-Range operation for the amplifier's Front (1/2) & Rear (3/4) channels.
  • Variable Frequency: You can set the amplifier's Low Pass or High Pass crossover from 50 to 200 Hz for the amplifier's Front (1/2) & Rear (3/4) channels.


Power/Ground/Turn-On Terminals: The four-channel amplifier features set-screw terminals for the power, ground, and remote turn-on connections.

  • Power and Ground: The JL Audio amplifier's set-screw Power and Ground connections are designed to accept 4 to 2 AWG power wire. A 2.5mm hex-wrench is supplied for making connections.
  • Remote Turn-On: The JL Audio JX series amplifier's set-screw turn-on lead will accept 18 to 8 AWG wire. The same 2.5mm hex-wrench is supplied for making connection.

Note: The Amplifier is not equipped with a fuse. An external 50-amp AFS, AGU, or MAXI 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 50-amps, the original should be replaced with a 50-amp fuse

Speaker Output Terminals: The JX360/4 amplifier's eight set-screw speaker terminals will accept 16 to 8 AWG speaker wire. The amplifier's speaker terminals can be wired in a 4-channel, 3-channel, or 2-channel configuration. A 2.5mm hex-wrench is supplied for making connections.

Preamp Inputs: The four-channel amplifier features two sets of stereo RCA input jacks. The amplifier features a dedicated Input Sensitivity gain control for the Front (1/2) & Rear (3/4) channel inputs. These controls are designed to match the input sensitivity of the JX360/4 to the specific signal source that is feeding it. The amplifier's low-level input can be set between 200mV-4V RMS.

Speaker Level Inputs: The JL Audio JX360/4 also accepts speaker level signals, including those from factory systems (without the need for a line-output converter), via two 10" speaker-level harnesses (included). The amplifier's high-level input can be set between 2V-10V RMS.

Preamp Outputs: The JX360/4 incorporates a pass-through preamp output sections, so that additional amplifiers can easily be connected to the same signal(s) feeding the four-channel amplifier. These preamp output signals are buffered to prevent noise and are always preamp level, regardless of the level of signals feeding the amplifier's inputs.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

3 questions already asked

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Krissy  Jun 09, 2014 ]  Staff
Hi Jesse, It should be fine, you should set it up as mono output to get the best power. I set this amp as for my hi's with component speaker for front and rear. [ TIEN  May 16, 2014 ]
Yes you can, I have that set up in my truck now. I Put the head unit RCA sub output to the amps rear channels, then bridged the rear amp channels to the sub. I took the head unit front RCA outputs and put them on the amps front channel input, then wired the front speakers direct to the front output of the amp. I ran the rear channels from the head unit directly to the rear speakers in the truck. It sounds great. Good luck. [ JAMES  May 14, 2014 ]
I donl't know. But I'll say this. This amp rocks! [ RANDY L  May 13, 2014 ]
I forwarded your question to an Advisor and they responded with the following: I'd say the difficulty depends on you level of experience doing installs and the tools you have at your disposal. A beginner may find it challenging, but do-able especially with our tech support available. I'd say it's more time consuming than anything. You should expect to give up a good portion of an afternoon. You'll need an amp wiring kit which I have linked below for that amp. There's currently a half off promo on the amp kit with the purchase of the amp. Here are some helpful tools and some speaker wire. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Apr 22, 2014 ]  Staff