Description

JL Audio® AP Series • 4-Channel Compact Marine Amplifier

JL Audio AP300/4 – 4-Channel Class-D Marine Amplifier

The JL Audio AP300/4 is a compact 4-channel Class-D amplifier from the AP marine series, designed to deliver up to 300 watts of clean, efficient power in a small, IP67-rated chassis. It can drive multiple pairs of full-range speakers or a mix of speakers and a subwoofer using its flexible bridging and onboard crossovers, making it ideal for small to mid-size boats and powersports builds where space and reliability are critical.

4-channel Class-D amplifier Up to 300 W RMS total power Built-in LCD control display Easy Tune compatible IP67, ignition protected* Compact 9–16 VDC design

Compact Class-D Power for Multiple Zones

As the 4-channel model in the AP lineup, the AP300/4 is engineered to power up to four pairs of speakers or a combination of two pairs of speakers and a subwoofer using bridged channels. Its efficient Class-D topology delivers strong output while minimizing battery drain, a key advantage on marine and powersports electrical systems.

At 14.4 V and less than 1% THD, the AP300/4 is rated for 50 watts x 4 into 4 ohms or 75 watts x 4 into 2 ohms. For higher-output configurations, channels can be bridged to provide 150 watts x 2 into 4 ohms, giving you flexibility in how you allocate power between full-range zones and low-frequency channels.

4-channel Class-D amplifier designed for full-range or mixed speaker/subwoofer systems.
Rated continuous power of 50 W x 4 @ 4 Ω or 75 W x 4 @ 2 Ω (14.4 V, <1% THD).
Bridged output capability of 150 W x 2 @ 4 Ω for higher-output speaker or subwoofer channels.
Full-range frequency response from 20 Hz–20 kHz (+0, -1 dB) for clear, wide-band audio.
Signal-to-noise ratio >70 dB (A-weighted, 20 Hz–20 kHz, referred to 1 W) for low-noise performance.

LCD On-Amp Control, Easy Tune & Marine Durability

A built-in LCD display gives you direct access to key amplifier settings at the amp itself, simplifying setup and adjustments during installation or service. For further optimization, the AP300/4 supports JL Audio’s Easy Tune feature when paired with a compatible Fusion® stereo that has built-in DSP and the Fusion® Audio app, allowing quick, profile-based setup to help protect speakers and maintain consistent system tuning.

Designed for harsh marine environments, the amplifier chassis carries an IP67 water and dust rating (excluding cables) and is ignition protected. Its compact footprint and low idle current draw make it easy to mount and integrate in tight compartments without putting unnecessary strain on the battery system.

Built-in LCD display for manual control and amplifier setup right on the unit.
Easy Tune feature supported when used with Fusion® stereos with DSP and Fusion® Audio app.
IP67-rated amplifier chassis (excluding cables) for water and dust resistance.
Ignition protected design for use in appropriate marine engine compartments.
Physical dimensions: 1.86" (H) x 10.43" (W) x 4.90" (D) / 47 x 265 x 125 mm.

General & Audio Specifications – AP300/4

Part Number	010-03429-00 (AP300/4, 4-channel model)
Channels	4-channel
Amplifier Class	Class D
Operating Voltage	9–16 VDC
Water/Dust Rating	IP67 (amplifier chassis, excluding cables)
Operating Temperature	4° to 149°F (-20° to 65°C)
Rated Power @ 4 Ω (14.4 V)	50 W x 4 / 150 W x 2 bridged (<1% THD)
Rated Power @ 2 Ω (14.4 V)	75 W x 4 (<1% THD)
Frequency Response	20 Hz – 20 kHz (+0, -1 dB)
Signal-to-Noise Ratio	>70 dB (A-weighted, 20 Hz–20 kHz, referred to 1 W)
Standby Current	<1 mA
Idle Current	Approximately 700–750 mA
Fuse Rating	35 A (AFS, AGU, or MaxiFuse™ recommended)
Minimum Power/Ground Wire	4 AWG copper wire
Protection Circuits	Input under/over voltage, over-temperature, output short circuit
Amplifier Dimensions (H x W x D)	1.86" x 10.43" x 4.90" (47 x 265 x 125 mm)
Warranty	3 years

Signal Processing & Crossover Features – AP300/4

High-Pass / Low-Pass Filters	Yes – full-range filters, user selectable
Filter Modes – Channels 1 & 2	Off, High-pass (HP) or Low-pass (LP)
Filter Modes – Channels 3 & 4	Off, High-pass (HP) or Low-pass (LP)
Filter Slope	12 dB/octave (all channels)
Filter Frequency Range	20 Hz – 500 Hz (HP or LP, channels 1–4)
HP Variable Crossover	Yes – 4-channel, 12 dB/octave
LP Variable Crossover	Yes – 4-channel, 20–500 Hz
Bass Boost EQ	0 to +18 dB @ 37 Hz
Input Sensitivity	RCA inputs switchable: 200 mV–2 V RMS (Low), 800 mV–8 V RMS (High)
Input Impedance	11 kΩ (High), 20 kΩ (Low)

What's In The Box

JL Audio AP300/4 4-channel marine amplifier
Four amplifier mounting screws
Documentation and installation information

Extra Information

Brand:

JL Audio

Weight:

5.00 LBS

UPC:

729218924525

Bundle:

Feature 1:

Compact 4-channel Class-D marine amplifier designed to power up to four pairs of speakers, or two pairs of speakers plus a subwoofer via bridged channels in a single, space-efficient chassis.

Feature 2:

Delivers 50 W x 4 @ 4 Ω or 75 W x 4 @ 2 Ω, with 150 W x 2 bridged @ 4 Ω (14.4 V,

Feature 3:

Built-in LCD display allows manual control and quick setup of key amplifier settings directly on the amp without requiring additional tools or external devices.

Feature 4:

Easy Tune compatible when paired with a Fusion® stereo with built-in DSP and the Fusion® Audio app, enabling profile-based setup to streamline tuning and help protect speakers.

Feature 5:

Marine-ready, ignition-protected design with an IP67-rated chassis (excluding cables) for reliable operation in harsh environments, plus a compact footprint at 1.86" H x 10.43" W x 4.90" D.

Condition:

NEW

Weight:

5.0000 lbs

Shipping:

Free 2-Day Shipping!

Manufacturer SKU:

010-03429-00

__SaleBox:

Warranty Information

JL Audio Warranty

Mobile Audio Subwoofer Drivers	JL Audio Subwoofer Drivers are warrantied against defects in materials and workmanship for One (1) Year from purchase date.
Mobile Audio Amplifiers and Electronic Products	JL Audio Amplifiers and Electronics are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Mobile Audio Speaker Systems	JL Audio Speaker Systems are warrantied against defects in materials and workmanship for One (1) Year from purchase date.
Mobile Audio Engineered Connection Systems	JL Audio Engineered Connection Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Mobile Audio Enclosed Subwoofer Systems	JL Audio Enclosed Subwoofer Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Stealthbox® Subwoofer Systems	JL Audio Stealthbox® Subwoofer Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Marine Speaker Systems and Subwoofers	JL Audio Marine Speaker Systems and Subwoofers are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Marine Amplifiers and Electronics	JL Audio Marine Amplifiers and Electronics are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Marine Engineered Connection Systems	JL Audio Engineered Connection Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
SlamPak™ Powersports Audio Systems	JL Audio SlamPak™ Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.
Stealthbox® Powersports Subwoofer Systems	JL Audio Stealthbox® Subwoofer Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date.

Click here for detailed JL Audio warranty information.

JL Audio AP300/4 - 4-Channel Compact 300-Watt Marine Amplifier

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