JL Audio HX300/1

Compact full-range mono amplifier — 300 watts RMS x 1 at 2 ohms

Item #: 136HX3001

In Stock

1 Review

Your price: $229.99 Earn up to 230 Rewards points

Add to Cart

+ Add to wishlist + Email me alerts for this product

View all associated offers

Your go-to solution for powersports applications

JL Audio HX300/1

Bass boost and other controls let you optimize the output to your sub.

JL Audio designed their HX300/1 amp specifically for applications like motorcycles and ATVs. Thanks to JL Audio's proprietary NexD™ amplifier technology, this compact amp plays your music with true fidelity and it fits into some tight spots, too. The amp's cast-aluminum chassis and its IPX6 water resistance rating ensure that it'll keep cranking out the power even when it takes some knocks or encounters some wet going.

Versatile power

The HX300/1 delivers 160 watts RMS to a 4-ohm sub, or a punchy 300 watts to a 2-ohm load. And you can use a pair of these compact amps to power a set of full-range speakers too. You can adjust the bass boost to dial in a little extra thump, while the subsonic filter eliminates ultra-low frequencies that muddy the output

Works with almost any radio

Thanks to selectable high- and low-level inputs, you can connect this amp to just about any factory or aftermarket stereo. So whether it's a motorcycle, an ATV, or a car application where space is tight, you can count on the HX300/1 to provide you with plenty of power while keeping a small footprint

Product Highlights:

  • full-range mono amplifier
  • 160 watts RMS x 1 at 4 ohms (300 watts RMS x 1 at 2 ohms)
  • variable low-pass filter (35-300 Hz, 12 dB/octave)
  • variable subsonic filter (20-40 Hz)
  • bass boost (0 to +12 db at 43 Hz)
  • Class D amplifier design with NextD™ switching amp technology
  • IPX6 water-resistance rating
  • corrosion-resistant cast aluminum chassis
Connection Features
  • preamp and speaker-level inputs (speaker wire to RCA adapter required for speaker-level input)
  • 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 35-amp in-line fuse between the distribution block and the amplifier is recommended
  • frequency response: 20-12,000 Hz
  • 8-11/16"W x 1-13/16"H x 3-1/8"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.

JL Audio HX300/1 Reviews

Average Customer Review:

1 reviews
Review this product
Great Gear Giveaway

Submit a review and then enter to win a $350 rewards card


Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Powerful amp, small package

Written By James, Illinois on Monday, June 22, 2015

Crutchfield Customer Review (What's this?)

I bought this amp because it was small and packed a punch (based on the specs). I have it paired to a 8" Polk db840. I really should have got a 10" but this works for now.

I have used JL products in the past, and this is no different. Very nicely made and powers my 8" sub easily. I kind of wish I went to a 10" instead, this amp could handle it.

One nitpick, I do wish the controls were on the top part of the amp so that you didn't have to dismount it every time you want to adjust the settings. But I have it mounted in a place where I can easily access it for fine tuning.

The main harness on this amp is built in. You just need to connect your power, ground, remote, rca's, and signal wires accordingly.

Pros: Great compact size, will fit just about anywhere. I have it mounted underneath the back seat of my pickup truck. Powerful amp for it's size. Great dollar value

Cons: Controls are on the underside of the amp, so when retuning, you need to dismount it and flip it over. Make sure you leave a little bit of extra wiring so you have room to flip the amp over when tuning.

Hands-on research

What's in the box?

Download owner's manual

  • Monoblock amplifier with attached 12" wires
  • 35A ATO fuse (installed in in-line fuse holder)
  • Spare 35A ATO fuse
  • 4 Self-tapping screws (1" length)
  • Owner's Manual

Product Research



Monoblock Amplifier: The JL Audio HX300/1 compact full-range, monoblock Class D amplifier. The amp has an IPX6 water-resistance rating that makes it ideal for motorcycles, ATVs, or other utility vehicles. It can be used to drive a subwoofer, or you can use two to power full-range satellite speakers.

NexD Switching Technology: The HX300/1 employs an advanced, high-speed Class D switching design called NexD that allows the amp to produce serious power without overtaxing the battery and charging system.

Amplifier Ratings:

  • Rated Continuous (RMS) Power @ 14.4 V:
    • 160 watts RMS x 1 @ 4 Ω
    • 220 watts RMS x 1 @ 3 Ω
    • 300 watts RMS x 1 @ 2 Ω
  • Rated Continuous (RMS) Power @ 12.5V:
    • 160 watts RMS x 1 @ 4 Ω
    • 200 watts RMS x 1 @ 3 Ω
    • 250 watts RMS x 1 @ 2 Ω

Input Section: The HX300/1's input section accepts a wide range of input voltage levels. It can accept a line-level signal from 250 mV to 4 Volts, or speaker-level signals from 750 mV to 15 Volts. The amp is equipped with an Input Voltage switch that allows you to choose Low or High level input signals.

Protection Circuitry: The HX300/1's protection circuitry automatically shuts the amplifier down if thermal limits are exceeded, a short-circuit is detected in the speaker wiring, or if current levels are too high. The green Power LED and red Protect LED will indicate by its on/off or flashing status.


Control Panel: The amplifier's control panel is located on the bottom of the amplifier. The removable cover features a rubber gasket that seals out moisture and dust. The cover is held in place by 4 Phillips-head screws. You will need a small flat screwdriver to set the three switches and four rotary dials. The following controls are located in the Control Panel:

  • Output Polarity: This switch lets you reverse the polarity of the amp's output. If the amp's output sounds "muddy", it may improve by switching the polarity from 0° to 180°.
  • LP Filter Switch: The amp is equipped with a switchable low-pass filter. The LP Filter switch turns the crossover on or off.
  • Input Voltage: You can select the type of input signal being used: High Level (speaker) or Low Level (line).
  • Bass Boost: The amplifier is equipped with a variable 0 to +12dB bass boost, centered at 43 Hz. The rotary dial lets you adjust the amount of boost you desire.
  • Input Sensitivity: The Input Sensitivity Control is a rotary dial that lets you match your source unit's output voltage to the input stage of the amplifier for maximum clean output.
  • LP Filter Frequency: When the LP Filter Switch is turned on, you can set the cutoff frequency on the rotary dial. The low-pass filter is continuously variable from 40Hz to 400Hz, with detents at 80Hz and 130 Hz. The LP filter has a slope of 24dB/Octave.
  • Infrasonic Filter: An infrasonic filter is a high-pass filter that cuts out super-low frequencies before they reach the speakers. Many speakers cannot physically reproduce these low frequencies, and, by filtering out these frequencies, you can reduce distortion and make the amplifier more efficient. The infrasonic filter is continuously variable from 20Hz to 40Hz, and detents at 30Hz and 35Hz. The infrasonic filter has a slope of 12dB/Octave.

Remote Level Control: The HX300/1 is equipped with an RJ-25 connection for an optional wired Remote Level Control. The optional RBC-1 or M-RBC-1 will let you control the bass level of the amplifier from the driver's seat. If the amplifier is being installed in a location that is subject to moisture, the M-RBC-1, with its water-resistant connection cover, if recommended.


Wiring: The HX300/1's wiring is internally connected and exits the amp through a waterproof opening. The following connections can be found, each with 12" pigtails:

  • Power: Three 16-gauge wires braided together exit the amp entering a waterproof fuse holder (a 35A ATO fuse is inserted). A 10-gauge wire exits the fuse holder. JL Audio recommends a minimum of 8-gauge wiring for the power wiring.
  • Ground: A 10-gauge ground wire is connected to the amplifier. A minimum of 8-gauge wiring is recommended for the ground wire.
  • Remote Turn-On: A 16-gauge remote turn-on wire is connected to the amp. You should connect the turn-on lead to the remote turn-on output of your source unit. If the source unit does not have a dedicated remote turn-on output, the amp's turn-on lead can be connected to +12V via a switch that derives power from an ignition-switched circuit. Note: The amp does not have an audio signal-sensing turn-on, so the remote turn-on lead must be connected.
  • Signal Inputs (Low-Level): Two female RCA jacks are provided for the input signal. You can run a stereo or mono signal into the inputs--the input section automatically sums a stereo signal to mono. If you only have a single input connection, you should use a Y-adapter to split the mono signal and connect it to both the Left and Right RCAs. The RCA connectors have waterproof caps.
  • Signal Inputs (High-Level): If the source unit does not offer preamp level outputs, you can splice the speaker output wires to a pair of RCA plugs, or use the JL Audio XD-CLRAIC2-SW RCA-to-Speaker Wire Adapter.
  • Speaker Outputs: Two 16-gauge speaker wires are provided on the amplifier for connecting to the wiring to your speaker.
  • Optional Remote Level Control: The attached RJ-25 jack with a waterproof cover lets you connect an optional M-RBC-1 or RBC-1 Remote Level Control. Use the M-RBC-1 if a waterproof connection is needed.

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.