Amplificateur marin MX300/1 - visuel officiel 1

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JL Audio

010-03324-00

Marine amplifier MX300/1

The JL Audio MX300/1 marine monoblock amplifier is designed for demanding environments, delivering 300 watts RMS at 2 ohms thanks to its Class D NexD™ technology. IPX7 certified, it resists water and corrosion, ensuring efficient and durable audio performance for marine installations.

Includes an amplifier, four stainless steel mounting screws, a spare 30A fuse, and a user manual.

Retail priceBenefit from the professional rate

253,74€

253,74€ ~~289,99€~~

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Available in stock

Free pickup point from €150 in France
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Custom installation

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Installers near you

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Support service

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Technical specifications

Amp Class	Class D
Speaker Channels	1
Audio Output Power Rms	300
Total power output (W)	300
Impedance	2-4 ohms
Input voltage range	12V
Max power consumption	360 W
IP rating	IPX7
Weight	1.31 kg
Subwoofer Output	Dedicated to subwoofer
Source type	Low level (RCA), high level (speaker wire)
Color	Black
IP rating	IPX7

Detailed description

Designed for marine environments and motorized sports, the JL Audio MX300/1 monoblock amplifier delivers stable and efficient audio power. Using a Class D design with JL Audio’s NexD™ switching technology, this amplifier optimizes power delivery while minimizing distortion without overloading the load systems.

Audio performance and robustness

The MX300/1 delivers RMS power of 160 watts x 1 channel at 4 ohms, 220 watts x 1 channel at 3 ohms, and 300 watts x 1 channel at 2 ohms at 14.4V. At 12.5V, it provides 160 watts at 4 ohms, 200 watts at 3 ohms, and 250 watts at 2 ohms. Its frequency response is 20 Hz to 12 kHz (+0, -1dB), with total harmonic distortion (THD) below 1% at 2 ohms and a signal-to-noise ratio greater than 85 dB (A-weighted).

Rated IPX7, this amplifier withstands immersion up to 1 meter for 30 minutes, making it suitable for wet conditions. Its corrosion-resistant cast aluminum chassis, powder-coated finish, and stainless steel hardware contribute to its durability. Controls are protected by a sealed cover with a gasket.

Features and integration

The amplifier includes a variable low-pass filter adjustable from 35 to 300 Hz with a 12 dB/octave slope, as well as a variable subsonic filter from 20 to 40 Hz to protect subwoofers. A variable Bass Boost from 0 to 12 dB, centered at 43 Hz, is also available. The dual-range input section accepts both preamp-level signals (RCA) and speaker-level signals (via adapter). The balanced-differential inputs are designed to reduce audio signal noise. The advanced thermal rollback protection system prevents amplifier shutdown in case of thermal overload. A polarity switch simplifies output adjustment. An optional remote bass controller (RBC-1 or M-RBC-1) can be connected for easy subwoofer level adjustment.

Documentation

Type	Nom
	Manuel utilisateur - Manuel d'utilisation pour amplificateur marin MX300/1 (EN)

Expert opinion

« JL Audio MX300/1: The compact and high-performance marine amplifier »

The JL Audio MX300/1 amplifier is a relevant solution for sound systems in marine environments where compactness and robustness are critical. Its monobloc Class D design with NexD™ technology is a major advantage, enabling efficient energy conversion. This results in optimized electrical consumption, reducing the load on the boat’s electrical systems—a critical factor in standalone installations or small to medium-sized vessels.

Its IPX7 protection rating certifies high resistance to water projections and temporary immersion, making it ideal for installations in cockpits, under consoles, or in compartments prone to humidity without requiring an additional watertight enclosure. However, it is advisable to prioritize a location sheltered from direct and prolonged exposure to the elements to maximize its lifespan.

Integration of the MX300/1 is straightforward thanks to its dual input capability: it can accept preamplified signals via RCA or directly from speaker-level signals, offering great flexibility when connecting to various existing audio sources. The balanced differential inputs are particularly valuable in marine environments, where electrical interference can degrade signal quality. Advanced thermal protection and subsonic filtering are features that enhance the reliability and longevity of the entire audio system, protecting both the amplifier and connected subwoofers. Its compact footprint allows for discreet installations even in the tightest spaces.

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Marine amplifier MX300/1

253,74€

253,74€ ~~289,99€~~

Frequently Asked Questions

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What type of amplifier is the JL Audio MX300/1?

The JL Audio MX300/1 is a Class D monoblock amplifier, specifically designed for subwoofers. It can be used standalone or in stereo pairs to power marine or motorsports audio systems.

Is the MX300/1 amplifier waterproof?

Yes, the JL Audio MX300/1 amplifier is rated IPX7. This means it has been tested to withstand immersion in water up to 1 meter deep for 30 minutes, provided the control panel cover is properly installed. It is not, however, designed for prolonged submersion or exposure to high-pressure water jets.

What is included in the MX300/1 amplifier box?

The JL Audio MX300/1 amplifier box contains:

One (1) amplifierFour (4) stainless steel mounting screwsOne (1) spare 30A fuseOne (1) user manual

Which type of electrical system is this amplifier designed for?

This amplifier is specifically designed to operate with 12-volt negative-ground electrical systems.

What is the purpose of a class D monoblock amplifier?

A single-channel class D amplifier is designed to power one channel, typically a subwoofer, with high energy efficiency. This design reduces the amplifier's size and power consumption, which is particularly beneficial for marine and motorsport applications.

Can I use this amplifier with speakers other than subwoofers?

No, the JL Audio MX300/1 is a monoblock amplifier specifically optimized for subwoofers. It is designed to efficiently reproduce low frequencies and is not suitable for powering full-range speakers or tweeters.

What is the minimum power cable size required for the MX300/1?

The minimum recommended size for the positive power cable (+12V, red) and the ground cable (GND, black) for this amplifier is 8 AWG.

Where should the main power fuse be installed?

An appropriate fuse must be installed on the main power wire(s) of the amplifier, within 45 cm (18 inches) of the battery’s positive terminal. If this amplifier is the only device connected to this main wire, a 30A fuse must be used.

How to connect the ground wire (GND) of the amplifier?

The negative ground wire (black) must be connected to a clean, solid metal ground point near the amplifier. This can be the chassis ground if available. If no chassis ground is available, it may be necessary to connect directly to the battery’s negative terminal. Ensure all ground connections (source unit and amplifiers) are made at the same point.

How to connect the amplifier to the source unit for the audio signal?

You can connect the RCA input jacks of the amplifier to the preamplified outputs of your source unit (low-level connection). The amplifier automatically sums the stereo signals to mono for its internal section. If you use a single mono RCA connection, it is recommended to use a Y-adapter to split it and connect it to the left and right RCA inputs of the amplifier.

How does the remote start function of the amplifier work?

The remote turn-on wire (blue) must be connected to the positive remote turn-on output (+12V) of your source unit. If your source unit does not have a dedicated output, the amplifier's turn-on wire can be connected to +12V via a switch powered by a circuit switched by the ignition.

Where is the best place to install the MX300/1 amplifier?

Where possible, the amplifier should be mounted in a dry, well-ventilated location that does not interfere with other electronic equipment. If a dry environment is not available, a location not exposed to significant spray may be used. It must never be mounted in the engine compartment or in areas of extreme heat. Ensure it is securely mounted to prevent detachment.

How to access the amplifier settings?

The amplifier settings and controls are located on the lower panel, under a watertight protective cover. To access them and make adjustments, you must remove the four Phillips-head screws from the central panel. Do not forget to replace the cover once the adjustments are complete.

Is this amplifier compatible with audio systems that have no preamplified outputs (RCA)?

Yes, if your source unit has no preamplified signal outputs, you can connect the source unit’s speaker wires to a pair of RCA plugs for the high-level input. You may also use the JL Audio ECS Speaker Wire to RCA adapter (XD-CLRAIC2-SW). It is critical to observe correct polarity when making these high-level input connections to avoid signal loss.

Can I control the subwoofer level remotely?

Yes, the subwoofer output level of the amplifier can be controlled from the front of the vehicle or boat with an optional remote level controller, sold separately. You can use the RBC-1 model for dry installations or the M-RBC-1 for applications exposed to moisture.

Is it possible to use this amplifier in an aircraft?

No, this product is neither certified nor approved for use in aircraft.

Can I power this amplifier with a voltage other than 12V?

No, this amplifier is designed to operate only with 12-volt electrical systems. Using this product in systems with voltages other than 12V may cause product damage and will void its warranty.