JL Audio JX250/1

Mono subwoofer amplifier — 250 watts RMS x 1 at 2 ohms

Item #: 136JX2501

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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 JX250/1 mono amp puts out up to 250 watts RMS to your sub, so you'll experience plenty of full bass in your music. Use the variable low-pass filter and bass boost to tune the amp to your subwoofer system. An optional remote level control lets you turn the sub up or down from the front seat. The amp includes speaker-level inputs, along with preamp inputs and outputs, so it's ready to work in virtually any system.

Product Highlights:

  • mono subwoofer amplifier
  • 175 watts RMS x 1 at 4 ohms (250 watts RMS x 1 at 2 ohms)
  • Class AB 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
  • 8-gauge power and ground leads and a 30-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 30-amp in-line fuse between the distribution block and the amplifier is recommended
  • 11-5/16"W x 2-1/8"H x 7-3/4"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Hands-on research

What's in the box?

Download owner's manual

  • Monoblock subwoofer amplifier
  • 10" Speaker-level harness
  • 4 Mounting screws
  • 4 Flat washers
  • Hex-key
  • Owner's Manual

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

Product Research

Features
Controls
Connections

Features

Monoblock Class A/B Amplifier: The JL Audio JX250/1 is a class A/B monoblock subwoofer amplifier that has been optimized for low-frequency (20-150 Hz) amplification of connected subwoofers.

Note: The JX250/1 is not designed for driving full-range speakers, midrange drivers, or tweeters.

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:

JX250/1 Amplifier Specifications Ohms Watts Channels Frequency Response Signal-to-Noise THD
Rated Continuous (RMS) Power @ 14.4V 4 175 1 20-200 Hz 87 dB 1%
3 210 1 20-200 Hz 87 dB 1%
2 250 1 20-200 Hz 87 dB 1%
Rated Continuous (RMS) Power @ 12.5V 4 130 1 20-200 Hz 87 dB 1%
3 170 1 20-200 Hz 87 dB 1%
2 210 1 20-200 Hz 87 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 JX250/1'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.

Controls

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 JX250/1 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 JX250/1 is equipped with a RJ-11 connection for an optional wired Remote Level Control (136RBC1, sold separately) that allows volume level adjustment of the amplifier from the front of your vehicle.

Connections

Power/Ground/Turn-On Terminals: The monoblock 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 8 to 4 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 30-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 30-amps, the original should be replaced with a 30-amp fuse

Speaker Output Terminals: The JL Audio JX250/1 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 making connections.

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 JX250/1 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 JX250/1 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 JX250/1 incorporates a pass-through preamp output section, so that additional amplifiers can easily be connected to the same signal(s) feeding the monoblock 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 open the box, verify contents, 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.

JL Audio JX250/1 Reviews

Average Customer Review:

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Very Satisfied!

Written By ATJR, Lubbock TX on Sunday, November 16, 2014

Crutchfield Customer Review (What's this?)

Have been wanting this amp for a long time. Will never buy any other brand besides JL Audio.

JL

Written By Nancy, Pleasant valley, NY on Tuesday, May 06, 2014

Crutchfield Customer Review (What's this?)

Sounds great and a great company!!

well this is my opinion, this small but very powerful amp " rocks ", t

Written By Philipp (phil-roy) Collins, Sequatchie, tn. 37374 on Monday, March 03, 2014

One kick and amp, the best amp I've ever owned.

JL amp

Written By coachts, Granada Hills, CA on Tuesday, January 14, 2014

Crutchfield Customer Review (What's this?)

This amp provides smooth undistorted sound while running exceptionally cool. It delivers volume levels of higher rated amps of other brands. The smooth classy finish blends with the nice interior of the vehicle. Great match for my JL W3 sub

Pros: Excellent sound quality True wattage ratings Classy finish Easy setup

Cons: A little pricey but better than any other amp at that price

Great

Written By Joe, Philadelphia on Wednesday, December 04, 2013

Crutchfield Customer Review (What's this?)

Runs 2 of my 10w0's perfect.

Pros: Size price

Cons: None

Another great JL amp

Written By BillE, Fort Worth, Texas on Saturday, July 13, 2013

Crutchfield Customer Review (What's this?)

I am quite impressed with the quality and performance of JL Audio amps., especially for the price. This amp is paired with a JL Audio Stealthbox, and is a perfect match. It hits hard and stays cool/warm to the touch. Overall, I'm very happy.

Pros: Price, performance, size, reputation.

Cons: None.

JL/Kicker 250

Written By JL250/1, Exeter, CA on Wednesday, October 03, 2012

Crutchfield Customer Review (What's this?)

Very happy with this amp. It matches perfectly to my Kicker TC10 compact sub. The bass is well matched and defined to my Pioneer DEH 8600BT head unit. I do not know if it is the AB class circuitry but this amp offers great fidelity. I had a JL class D AH1400 amp and it was a bit "boomy" at the low end. The JL 250 amp is perfect for those looking for crisp bass without needing huge seismic rattling power.

Pros: great defined fidelity. smooth bass without distorting "boomyness"

Cons: none

JL JX 250/1

Written By Rob M., Larose, LA on Friday, March 09, 2012

Crutchfield Customer Review (What's this?)

It has only been connected for less than a week, but as usual JL has done its job again. I have not noticed the amp get hot after extended play time. The sub it is connected to (20 yr old JL 12 W1-4in a bandpass box) and it hits hard enough for what I am using it for. It hits the 20hz notes clearly. On the other end Crutchfield has come through as well with excellent instructions great price and friendly staff that has been able to help me out when ever I get stuck.. I would suggest this amp to anyone driving a sub that does not have outrageous power requirements.

Pros: Great directions regading installation. NIce power as mentioned above.

Cons: None so far

You wont be disappointed!

Written By MattD, Eau Claire, WI on Sunday, February 12, 2012

Paired this with a single 8W1v2 4ohm sub. I had the sub on a factory amp for a few days before the JL Audio JX250/1 came in. On the factory amp the sub sounded slightly better than the original sub did. Once I hooked up the JX250/1 the sub came alive!! I really can't believe the sound quality from these products! Could not be happier with both products from JL!!

Pros: Sound quality, runs cool, looks great, doesn't miss a beat.

Cons: NONE

rock without it

Written By paul, newnan ga on Saturday, August 06, 2011

I had a Alpine head unit with some 6 1/2 polk speakers installed in my 200 GMC standard cab.It just was not loud enough for me so I purchased a small alpine power pak. It got loud but the highs just too high and not enough bass,old time rock music just didnt sound right So i went to Ative Radio and the guy suggested an amp and sub to bring out the bass. checked around and was interested in the 500watt Alpine and sub. But no the box wouldnt fit behind the seat in a reg cab truck. I went back to the guy at Active Radio and he suggested the JX250/1 and a 250 watt sub. I was not wanting it due to low wattage and didnt think it would do the trick but went with it anyway. Wow Wow Wow, now the old time rock and roll sounds, well amazing. So yes you can buy this amp and be very pleased i assure you. The only reason i didnt give it the highest rating is I havent had it long enough to see if it will hold up. I now trust the guy and take his word it will be around a long time.

Get everything you’ll need to enjoy your new JL Audio JX250/1

Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
Add a remote and control your amp from the driver's seat.
For multi-amp systems, you'll need a separate fuse holder.
Helps protect your car's charging system and improves power handling. Required power and ground wires not included with cap.
The right tools will make the installation easier.
Have your new amplifier put in by a qualified professional in your area.
T-Spec 8RAK Installation Kit

T-Spec 8RAK Installation Kit

8-gauge amplifier wiring kit — includes 2-channel patch cable and speaker wire

Item #: 1208RAK

(3)

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EFX PA8BX Wiring Kit

EFX PA8BX Wiring Kit

8-gauge amplifier wiring kit — includes 2-channel patch cable

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Rockford Fosgate RFK8i

Rockford Fosgate RFK8i

8-gauge amplifier power and signal wiring kit

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Kicker CK8

Kicker CK8

Complete 8-gauge amplifier wiring kit — includes 2-channel patch cable and speaker wire

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T-Spec 8PK Installation Kit

T-Spec 8PK Installation Kit

8-gauge amplifier wiring kit — includes speaker wire

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Rockford Fosgate RFK8

Rockford Fosgate RFK8

8-gauge amplifier power wiring kit

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Kicker PK8

Kicker PK8

8-gauge amplifier power wiring kit

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T-Spec V10-RAK8

T-Spec V10-RAK8

8-gauge amplifier wiring kit — includes 2-channel patch cable

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Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (14 Gauge)

Item #: 541SPW514B

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T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

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T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

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T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (20-foot)

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EFX 17-foot RCA Patch Cable

EFX 17-foot RCA Patch Cable

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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (12-foot)

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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Core Series Twisted RCA patch cables — available in 5 different lengths (12-foot)

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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Elite Series Braided Multi-Core RCA patch cables — available in 5 different lengths (25-foot)

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JL Audio RBC-1

JL Audio RBC-1

Remote bass control for JL Audio amps

Item #: 136RBC1

(23)

$34.99
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EFX CFHG4 Fuse Holder

EFX CFHG4 Fuse Holder

In-line AGU fuse holder accepts 4- to 8-gauge wire

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Rockford Fosgate RFFAGU Fuse Holder

Rockford Fosgate RFFAGU Fuse Holder

Platinum-plated AGU fuse holder
Fits 4- or 8-gauge cable

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T-Spec Capacitor

T-Spec Capacitor

1.5-farad capacitor with red LCD meter

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Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

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S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

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S&G Tool Aid 87615

S&G Tool Aid 87615

Window and Door Clip Removal Tool

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S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

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Pro.Fit Hook Tool Set

Pro.Fit Hook Tool Set

Installation tools — pair

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Pro.Fit Trim Panel Tool

Pro.Fit Trim Panel Tool

Remove your vehicle's trim panels without damage

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Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

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Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

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Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

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Install Bay IB35400

Install Bay IB35400

Premium door panel and trim tool

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Install Bay 3320

Install Bay 3320

Auto-ranging digital multimeter

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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

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DEI Heat Shrink Tubing

DEI Heat Shrink Tubing

Black 4-foot length (Assortment)

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InstallCard: Amp or Equalizer

InstallCard: Amp or Equalizer

Prepaid professional amplifier or EQ installation

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Autosound 2000 Disc One

Autosound 2000 Disc One

Low Frequency Test CD (Disc One)

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Questions & Answers Ask the community. Share your knowledge.

2 questions already asked

I'm currently using the JL.AUDIO 10w6, and its powered by the JL 500/1, perfect match and incredible (Awesome) Bass and Sound, plays exceptionaly Clean and Clear "PERFECT MATCH" Sounds Awesome!!!!. [ Craig  Jun 11, 2014 ]
I have this amp and stealthbox in my 2006 silverado, love it... [ JOHNATHAN  May 30, 2014 ]
The answer to this is in the manual, you can go on jl audios site for it. I connected it to one so I can't say from experience. I know you can though as there are connections for two subs. [ BLAINE  Apr 21, 2014 ]
Wire the subs in parallel if they are 2 ohm. 4 ohm subs can be wired in series down to 2 ohm. [ joseph  Apr 21, 2014 ]