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Crutchfield

JL Audio JX250/1

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

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  • JL Audio JX250/1

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  • JL Audio JX250/1

  • JL Audio JX250/1

  • JL Audio JX250/1

  • JL Audio JX250/1

  • JL Audio JX250/1

  • JL Audio JX250/1

  • JL Audio JX250/1

  • JL Audio JX250/1

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Our take on the JL Audio JX250/1

by Buck Pomerantz
JL Audio

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.

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.

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
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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175 x 1
Peak Power Output (Watts x Channels)
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N/A
Power at 2 Ohms (Watts x Channels)
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250 x 1
Bridged Power (Watts x Channels)
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N/A
Minimum Impedance Bridged
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N/A
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-150 Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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87 dB
Input Voltage
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14.4v
Features
Amplifier Class
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AB
Low-Pass Crossover Frequency
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50-200 Hz
Low-Pass Slope (dB/octave)
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12 dB/octave
High-Pass Crossover Frequency
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N/A
High-Pass Slope (dB/octave)
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N/A
Bass Boost
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0-12 dB
Bass Boost Frequency
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45 Hz
Fan Cooled
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No
Fuse Rating
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30
Speaker Level Inputs
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Harness
Preamp Outputs
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1 pair
Width (inches)
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11-5/16
Height (inches)
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2-1/8
Depth (inches)
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7-3/4
Parts Warranty
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2 Years
Labor Warranty
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2 Years
Product 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

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.

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.

 
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JL Audio JX250/1 Reviews

Average Customer Review:

9 people say:

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Filter by rating:
4 out of 5

JL

Written By Nancy, Pleasant valley, NY on Tuesday, May 06, 2014
Crutchfield Customer Review (What's this?)
 
Sounds great and a great company!!
Was this review helpful?    Yes | No
 
5 out of 5

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.
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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
2 out of 2 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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.
3 out of 4 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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
4 out of 4 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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
8 out of 8 people found this helpful
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5 out of 5

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
6 out of 6 people found this helpful
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4 out of 5

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.
10 out of 12 people found this helpful
Was this review helpful?    Yes | No
 

2 questions already asked

Does anyone have the jl wedge box? I've heard great things but want to know if the time and cash to get it when my w7 and jx250x1 sound great in my current box. [ steve-o  May 28, 2014 ]
2 answers
  • 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 ]
how do I connect this amp to 2 subwoofers? [ Manny  Apr 21, 2014 ]
2 answers
  • 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 ]

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For a more in-depth review and enhanced detailed information on the JL Audio JX250/1, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_136JX2501/JL-Audio-JX250-1.html ).