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JL Audio JX500/1D

Mono subwoofer amplifier — 500 watts RMS x 1 at 2 ohms

36 Reviews | 11 questions - 23 answers

Item # 136JX5001D

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Our take on the JL Audio JX500/1D

JL Audio's JX500/1D mono amplifier will power your subwoofer with up to 500 watts RMS, so you can experience thunderous bass in your music. A variable low-pass filter and bass boost help you tune your sub to fit your system and sound its best. An optional remote level control lets you turn the sub up or down from the front seat.

Lots of power from a very small box

JL Audio's JX500/1D mono amplifier will power your subwoofer with up to 500 watts RMS, so you can experience thunderous bass in your music. A variable low-pass filter and bass boost help you tune your sub to fit your system and sound its best. An optional remote level control lets you turn the sub up or down from the front seat.

JL Audio's JX500/1D mono subwoofer amplifier

Compact, but beefy

You know you're holding a serious piece of sound equipment when you feel the heft of this tiny JX amp. JL Audio built it 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 high-mass aluminum heatsink keeps things cool enough to virtually eliminate thermal shut-downs.

Confused about impedance? Check out our article on matching subs and amps.

This amp is a lot of thump in a small package. It is great. I wished I would have gotten 2 of them for the sale price. I messed that up. When it comes on sale again I will purchase another one.

Tyrone, Louisville, KY

What's in the Box:

  • Monoblock subwoofer amplifier
  • 10" Speaker-level harness
  • 4 Mounting screws (M4 x 18mm)
  • 4 Flat washers
  • 2.5mm Allen wrench
  • Owner's Manual (En/ Ger/ Sp/ Fr)

Product Highlights:

  • mono subwoofer amplifier
  • 300 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms)
  • Class D amplifier design
  • MOSFET switching power supply
  • frequency response: 10 Hz - 150 Hz
  • variable low-pass filter (50-200 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • optional wired remote level control
  • 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
  • 7-7/8"W x 2-1/8"H x 7-11/16"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

JL Audio JX500/1D Reviews

Average Customer Review(s):

(36 Reviews)
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Hands-on research

Product Research



Monoblock Amplifier: The JL Audio JX500/1D monoblock subwoofer amplifier that has been optimized for low-frequency (10-150 Hz) amplification of connected subwoofers.

Note: The JX500/1D is not designed for driving full-range speakers, midrange drivers, or tweeters.

Class D Amplifier Circuit: The JX500/1D employs an advanced Class D switching design that allows it to produce 500 watts of clean subwoofer power while drawing significantly less current from your electrical system and generating less heat than a conventional Class A/B or Class B design.

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

Amplifier Ratings:

JX500/1D Amplifier Specifications Ohms Watts
Rated Continuous (RMS) Power @ 14.4V
(10-150Hz, 90dB S/N, 1% THD+N)
Rated Continuous (RMS) Power @ 12.5V
(10-150Hz, 90dB S/N, 1% THD+N)

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 JX500/1D'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 Input Sensitivity Control is used to match your source unit's output voltage to the input stage of the amplifier for maximum clean output:

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

Low Pass Crossover: The JL Audio JX500/1D monoblock amplifier is equipped with a 12dB/octave Butterworth low-pass filter with variable frequency selection from 50 to 200Hz.

Bass Boost: The amplifier is equipped with a variable 0 to +12dB, 45Hz Bass Boost.

Remote Level Control: The JX500/1D is equipped with an RJ-25 connection for an optional wired RBC-1 Remote Level Control (sold separately) that allows volume level adjustment of the amplifier from the front of your vehicle.


Power/Ground/Turn-On Terminals: The monoblock amplifier features set-screw terminals for the power, ground, and remote turn-on connections. A 2.5mm hex-wrench is supplied for tightening/loosening the set-screws.

  • Power and Ground: The JL Audio amplifier's set-screw Power and Ground connections are designed to accept 8 to 4 AWG power wire.
  • Remote Turn-On: The JL Audio JX series amplifier's set-screw turn-on lead will accept 18 to 8 AWG  wire.
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 JL Audio JX500/1D features four set-screw speaker terminals for an easy parallel subwoofer connection. The monoblock amplifier's four set-screw speaker terminals will accept 16 to 8 AWG speaker wire. A 2.5mm hex-wrench is supplied for tightening/loosening the set-screws.

Preamp Inputs: The monoblock amplifier features one set of stereo RCA input jacks. The amplifier features a dedicated Input Sensitivity gain control for these inputs. These controls are designed to match the input sensitivity of the JX500/1D 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 JX500/1D also accepts speaker level signals, including those from factory systems (without the need for a line-output converter), via the supplied 10" speaker-level harness. The amplifier's high-level input can be set between 2V-10V RMS.

Preamp Outputs: The JX500/1D incorporates a pass-through preamp output sections, so that additional amplifiers can easily be connected to the same signal feeding the monoblock amplifier. The preamp output signal is buffered to prevent noise.

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Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Great product [ Erick  Jun 22, 2017 ]
Love this amp [ Jonathan  Jun 15, 2017 ]
Pair with stealthbox [ Kerry  Jun 05, 2017 ]
Package deal [ Brian  May 09, 2017 ]
The reviews were great so I'm giving it a try. [ Marline  May 01, 2017 ]
It is a perfect match for the subwoofer I purchased [ Dominick A.  Feb 04, 2017 ]
Two letters, JL [ r  Dec 19, 2016 ]
This amp was recommended by Crutchfield with my purchase of two JL W3 10's. I was sold on this amp after watching YouTube reviews. "JL audio is an industry standard and always delivers" [ David  Oct 11, 2016 ]
recommended by a friend [ Clint  Jun 21, 2016 ]
have a JL JX250 not enough power to push the JL10inch in the power wedge ported box at 4 ohms 175 watts. Bass is ok but in trunk of my car just not enough. [ Shannon  Mar 05, 2016 ]
Friends recommended to me. Loved the performance. [ Zach  Feb 09, 2016 ]

11 questions already asked

Use the 4 gauge. That's what I use and the amp performs perfectly [ JAMES  Mar 09, 2017 ]
You could probably get away with the 8awg but you're better off with the 4awg [ Jennifer  Mar 09, 2017 ]
8awg for 8 to 10 feet will work just fine [ BILL  Mar 08, 2017 ]
I went with 4 just to be on the safe side. [ ryan  Mar 08, 2017 ]
With your purchase from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings/connections 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. [ Kenny  Sep 16, 2016 ]  Staff
Always match the RMS wattage of the speakers as close as you can to the amp rating. [ Olinda  Jun 09, 2016 ]
Hi. It's all according to your ear. To get good solid bass I usually run it 3/4 of the way around. Between half and 3/4 should get you where you want it. Especially with cd's and higher quality audio. If the bass is too much with the radio you can back it down to half way. Experiment with it and see what fits your particular ears the best. Keep your bass setting on your head unit around 2 positive, any other bass settings you might have keep them neutral, in the middle. When listening to high quality audio once your woofers are broken in you can crank it on up past 3/4 if you want. They are 12's correct? [ Olinda  Jun 09, 2016 ]
The input sensitivity depends on the preamp voltage output of your head unit. I think most units today are around 4V which is good. Turn the sensitivity all the way down on the amp and then turn the volume of your head unit up to around 75% of the full capacity. You can adjust the sensitivity from there until you've got a good volume. Typically, the lower you make the sensitivity, the more headroom the amplifier has so it won't clip at high volumes. [ JOSEPH  Jun 09, 2016 ]
The JL Audio JX500/1D is a mono (single channel) amp so there will be no bridging. You can wire the two 4 Ohm coils of the woofer in parallel to the amplifier to present a final 2 Ohm load though. You'll just have to set the amplifier gains carefully as it does offer more wattage (500 RMS) than your woofer is rated to handle (350 RMS). I hope that helps! My Bio: [ Ryan  Mar 21, 2016 ]  Staff
The only way I know add a subsonic filter is by getting a crossover with one in it. You can connect the crossover on the wiring between the radio and the amp. Feel free to call us on 1-800-324-9695 for a personalized recommendation. My Bio: [ Paul  Mar 07, 2016 ]  Staff
You can turn off the amp on the amp as well [ Daniel  Dec 13, 2015 ]
You still have to run the remote line back to the head unit. [ RANDY L  Dec 12, 2015 ]
Thanks for your question. For information on selecting the best amp for your subs 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  Jun 12, 2015 ]  Staff
if I understand correctly those have a 300rms. x 2 would be 600 rms this amp is 500w. plus its a mono. my thoughts are it wont be enough. I run this amp with the jl audio stealthbox for the colorado crew cab which has the 10w3v3 with 500rms. sounds awesome, but my ears want a ported box... but thats just me. [ JASON  Sep 16, 2014 ]
I'm not sure. What I would do is go to Crutchfield's website and pullup one of those subs. Check the specs on it and see what the nominal power rating is and multiply that times two. William [ William  Sep 11, 2014 ]
It will power them but you may find distortion at higher output levels because it's not pushing enough rms power for 2 JLw3s . I'd look at at least a 750 or 1000 [ SPENCER  Sep 11, 2014 ]
It should Brian, this little things pumps out a strong 500w with no problem. I've had mine for a few years now and it's as good now as it was new. [ CHRIS M  Sep 11, 2014 ]
Hello and yes you do need it i have mine that way. [ EVERARDO  Jun 26, 2014 ]
A converter is not required. This amplifier comes with an additional wire harness that you can hook up your high level output (factory speaker wires) into without a problem. And it also has an RCA output if you were to add an additional amplifier later. [ ALAN A  Jun 26, 2014 ]
No you do not need a line output converter. The required wiring comes packaged with the amp to allow you a direct connection to your factory head unit via the speaker outputs of the radio [ ANTONIO  Jun 26, 2014 ]
What speaker wire outs do you use to hookup one sub? [ chris  Apr 24, 2014 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. 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: [ Jeff  Feb 01, 2014 ]  Staff