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JL Audio JX250/1

250W RMS JX Series Monoblock Class A/B Subwoofer Amplifier

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JL Audio JX250/1

250W RMS JX Series Monoblock Class A/B Subwoofer Amplifier

$199.95

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JL Audio JX250/1

JL Audio JX250/1 - JX Series Monoblock Class D Subwoofer Amplifier

The JL Audio JX Series of amplifiers are designed with a specific purpose; to deliver clean, rock-solid performance and reliability at an affordable price. Unlike gimmicky price-conscious amplifiers, JL Audio employs specified oversized output transistors and rugged MOSFET power supplies to unsure proper current, thermal capacity and better overall performance. In addition, the JX250/1 includes flexible signal processing capabilities with a fully variable 12 dB/octave crossover filter, pass-through preamp outputs and a Bass EQ. With the optional JL Audio RBC-1 Remote Level Control (sold separately), you can control the subwoofer volume from the front of the vehicle.

JX monoblock subwoofer amplifiers are specifically designed to drive subwoofers. Their frequency response is limited to the range below 150 Hz., making them unsuitable for driving midrange speakers or tweeters.

Integration Flexibility

Integration Flexibility

For those systems that do not offer a preamp level signal option, you can connect speaker level signals directly to the “Hi-Level Inputs” connector using the supplied connector and wire harness. Simply splice the appropriate left/right and positive/negative wires to the included harness and plug the harness into the “Hi-Level Inputs” connector on the amplifier. The JX monoblock will attenuate the high-level signal to make it compatible with its input stage. Alternatively, a traditional left/ right pair of RCA type jacks is used for preamp level (low-level) signals. This is the preferred connection method whenever available.

Low-Pass Active Filter

Low-Pass Active Filter

The JX monoblock features a 12 dB/octave low-pass active filter for its internal channel. This feature is designed to attenuate frequencies above its filter frequency, so that the system’s subwoofer(s) do not reproduce any audible and often harmful mid-range frequencies. The low-pass filter is fully variable between 50 Hz and 200 Hz via the “Filter Frequency” control knob. 80 Hz is a good starting point for system tuning, but its also advisable to match the crossover point with that of your satellite speakers' high-pass filter - this ensures that your system is properly distributing the frequencies to the appropriate medium.




General Features:

  • JX Series Monoblock Class D Subwoofer Amplifier
  • RMS Power Rating (14.4V):
    • 4 ohms: 175 watts x 1 chan.
    • 3 ohms: 210 watts x 1 chan.
    • 2 ohms: 250 watts x 1 chan.
  • RMS Power Rating (12.5V):
    • 4 ohms: 130 watts x 1 chan.
    • 3 ohms: 170 watts x 1 chan.
    • 2 ohms: 210 watts x 1 chan.
  • Unregulated PWM switching type power supply
  • LED power (green) and protect (red) indicators
  • Soft start turn-on prevent clicking and popping when system turns on
  • Speaker-level (high-level) inputs with included harness
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Heavy duty aluminum alloy heatsink for effective heat dissipation
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Dual speaker terminals simplify the hookup of multiple speakers
  • Remote bass level input (JL Audio RBC-1 sold separately)
  • Input sensitivity:
    • Low level input: 200mV - 4V
    • High level input: 2.0mV - 10.0V
  • Variable Bass Boost: 0 to +12 dB bass boost centered at 45 Hz
  • Variable low-pass filter: 50 - 200 Hz, 12 dB/octave
  • Frequency Response: 10 - 150 Hz ± 1 dB
  • Total Harmonic Distortion (THD): 1%
  • Signal to Noise Ratio: >87 dB
  • Damping Factor @ 4 ohms: >160 @ 4 ohms
  • Fuse Rating: 30A x 1 inline (not supplied)
  • 8 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.
  • Weight: 3.80 lb
  • Dimensions: 7.68"W x 10.94"L x 2.09"H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty


Check out the JL Audio JX250/1 Owner's Manual

Power Specifications - Subwoofer Channel

RMS Power @ 4 ohms
The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far. If the final impedance of your speaker(s) or subwoofer(s) equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
175 watts x 1 channels
RMS Power @ 2 ohms
The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far. If the final impedance of your speaker(s) or subwoofer(s) equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
250 watts x 1 channels

Amplifier Specifications

Amplifier Series
This designates the series of the amplifier. Many amps are available in a litany of different wattage and channel configurations, but maintain consistent features throughout the product line.
JX (JL Audio)
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

AB
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
1 - Mono
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

250 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
8 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Not Bridgeable
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
1%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Yes - with included adapter
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
1 pair
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 200 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
87 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 12 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Optional (Accessory required and sold separately)
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
30A X 1 In-Line Fuse Recommended
Strappable
Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.
No
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
Not Tested

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
50%
4 Star
33%
3 Star
17%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.2
Value
3.7
Features
3.8
Design
4.3
Usability
4.5
Erik

Livermore, CA

Overall
Durability
Value
Features
Design
Usability
Still don't understand JL's value

October 14, 2013

I bought this product based off reviews and JL's popular name, I should have done more research. It's a great product, easy to use, but for the price I paid, I just don't understand why. In my lifetime, I've owned Elemental Designs, Hifonics, Bazooka, all with more rms, and paid about the same, if not less. Performance wise, I couldn't tell much of a difference. I would understand if the JX was underrated, but it was rated just right.

I hate how it didn't come with a remote bass knob (sold separately, and for a lot) and not that it matters, but it doesn't have phase or subsonic filter - for that price.

21 of 39 found this helpful

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chance1844

cherryville, sc

Overall
Durability
Value
Features
Design
Usability
awesome!

December 26, 2011

This amp is very powerful. I got it installed today with 2 10" JL audio vented subs. It hits harder than my friends setups and they have like 500 and 700 watt amps (they're not JL amps) JL is top of the line in subs and amps and in quality sound! Definitely a good thing to buy because the good price and how powerful it is, therefore you can get a really good wiring kit! Just put it this way, my parents got this for my setup and there pissed cause of how loud the bass is!

19 of 36 found this helpful

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no

Australia

Overall
Durability
Value
Features
Design
Usability
andrew

May 27, 2013

the jx250/1 is a great little amp for your sub. mine draws a bit too much current and gets a bit hot only when being caned 93db. would suit a 10" perfect. bit small for the 12" 250w rms 2ohm dual coil I run but does the job

20 of 39 found this helpful

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MPdesignsAV

Windham, ME

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Compact and solid performance.

April 13, 2015

Used this to provide a cleaner, adjustable signal to the factory JBL subwoofer in a Tundra Crewmax. Swapped out the HU and wanted to be able to adjust the sub level for finer tuning ability. This fit perfectly behind the passenger side seat and runs cool and provides plenty of power to the factory sub.

9 of 19 found this helpful

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jacob

Butler, PA

Overall
Durability
Value
Features
Design
Usability
Not bad

October 30, 2011

I bought this amp on impulse at the local shop. I installed it under the seat in my suv and ran the jl ported w1 8" sub/box @ 4ohm. The amp never got hot under the seat, stayed cool after long play. I never tested it @ 2ohm. I ended up buying a bigger amp to run something different. This amp won't produce more than what it is rated, but it will run it's rated power efficiantly and decently clean.

20 of 42 found this helpful

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Ski Bum

Arvada,CO

Overall
Durability
Value
Features
Design
Usability
Great Amp

August 15, 2012

JL amp is driving my 12" woofer. It was easy to install and had great directions for adjusting it to my subwoofer. Urea a great improved to my sound system in my truck. It also really bumps when I want to. I am planning on buying another one.

16 of 36 found this helpful

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25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

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Product Summary

Manufacturer

Model Number

JX250/1

UPC

699440993982

Weight

6.77lbs

Internal SKU

jx2501

Internal Product ID

33532

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: JL Audio JX250/1