Description

JL Audio® AP Series • Monoblock Compact Marine Amplifier

JL Audio AP300/1 – 300-Watt Class-D Marine Monoblock Subwoofer Amplifier

The JL Audio AP300/1 is a compact Class-D monoblock amplifier from the AP marine series, purpose-built to power a dedicated subwoofer channel in boats and powersports systems. It delivers up to 350 watts of continuous power at 2 ohms from a small, IP67-rated, ignition-protected chassis that is designed to survive in harsh marine environments.

Monoblock Class-D subwoofer amp Up to 350 W RMS @ 2 Ω Built-in LCD control display Easy Tune compatible IP67, ignition protected* Compact 9–16 VDC design

Dedicated Subwoofer Power in a Compact Chassis

As the monoblock model in the AP lineup, the AP300/1 is optimized to drive a single subwoofer or subwoofer array with stable Class-D power and sub-bass-focused signal processing. It is designed to run from a 9–16 VDC marine electrical system, providing strong output with lower battery drain than traditional Class-AB amplifiers.

At 14.4 V and less than 1% THD, the AP300/1 is rated for 200 watts x 1 into 4 ohms and 350 watts x 1 into 2 ohms. Its 10 Hz–500 Hz bandwidth is tailored for subwoofer duty, with onboard crossovers and filters aimed at low-frequency control and driver protection.

Monoblock Class-D design specifically engineered for powering a subwoofer channel.
200 W x 1 @ 4 Ω and 350 W x 1 @ 2 Ω (14.4 V, <1% THD) for strong, controlled bass output.
Subwoofer-focused frequency response from 10 Hz–500 Hz (+0, -1 dB).
Signal-to-noise ratio >70 dB (A-weighted, 20 Hz–20 kHz, referred to 1 W) to help keep system noise low.
Compact footprint: 1.86" (H) x 10.43" (W) x 4.90" (D) / 47 x 265 x 125 mm.

On-Amp Control, Easy Tune & Marine Durability

A built-in LCD display on the amplifier provides direct access to key settings, simplifying setup and fine-tuning without needing external tools. For further optimization, the AP300/1 supports JL Audio’s Easy Tune feature when paired with a compatible Fusion® stereo with built-in DSP and the Fusion® Audio app, enabling profile-based configuration focused on sound quality and system protection.

The amplifier chassis is built to IP67 water and dust standards (excluding cables) and is ignition protected, making it suitable for demanding marine environments and appropriate engine compartment installations. Its compact size and low idle current draw also make it easier to locate and power in small compartments.

Built-in LCD display for manual control and amplifier configuration on the unit itself.
Easy Tune compatible when used with Fusion® stereos that include DSP and the Fusion® Audio app.
IP67-rated amplifier chassis (excluding cables) for water and dust resistance.
Ignition protected design for compliant installation in suitable engine compartments.
Operating temperature range from 4° to 149°F (-20° to 65°C).

General & Audio Specifications – AP300/1

Part Number	010-03428-00 (AP300/1, monoblock model)
Channels	Monoblock
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)	200 W x 1 (<1% THD)
Rated Power @ 2 Ω (14.4 V)	350 W x 1 (<1% THD)
Frequency Response	10 Hz – 500 Hz (+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 (monoblock/4-channel)
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 – AP300/1

High-Pass / Low-Pass Filters	Yes – low-pass full-range filter for subwoofer channel
Filter Mode	Low-pass only (monoblock)
Filter Slope	12 dB/octave
Filter Frequency Range	20 Hz – 500 Hz (low-pass)
LP Variable Crossover	Yes – 20–500 Hz, 12 dB/octave
Bass Boost EQ	0 to +18 dB @ 37 Hz
Infrasonic Filter (Subwoofer)	20–50 Hz, defeatable
Output Polarity Switch	Yes – for subwoofer phase alignment
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 AP300/1 monoblock marine amplifier
Four amplifier mounting screws
Documentation and installation information

Extra Information

Brand:

JL Audio

Weight:

5.00 LBS

Manufacturer SKU:

010-03428-00

RMS Power In Watts:

300

UPC:

729218924518

Bundle:

Feature 1:

Compact Class-D monoblock marine amplifier specifically engineered to power a dedicated subwoofer channel from a small, ignition-protected, IP67-rated chassis.

Feature 2:

Delivers 200 W x 1 RMS @ 4 Ω and 350 W x 1 RMS @ 2 Ω (14.4 V,

Feature 3:

Subwoofer-focused frequency response from 10 Hz–500 Hz (+0, –1 dB) with user-selectable low-pass filter (20–500 Hz, 12 dB/octave) and variable bass boost EQ from 0 to +18 dB at 37 Hz for tuning low-end performance.

Feature 4:

Built-in defeatable infrasonic (subsonic) filter adjustable from 20–50 Hz on the subwoofer channel to protect woofers from excessive ultra-low-frequency excursion in marine enclosures.

Feature 5:

Output polarity switch on the monoblock channel simplifies subwoofer phase alignment without rewiring, improving integration with full-range speakers.

Condition:

NEW

Weight:

5.0000 lbs

Shipping:

Free 2-Day Shipping!

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 AP300/1 - Monoblock Compact 300-Watt Marine Amplifier

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