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Marine Amplifier 4-Channel JL Audio M400/4 400W Class D, SKU JLM400/4

JLM400/4

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Product Specifications and Features

The JL Audio M400/4 is a compact 4-channel Class D marine full-range amplifier designed to deliver clean, efficient power in harsh onboard environments. It’s an ideal choice for driving four marine speakers, or for flexible 3-channel setups (two speakers plus a bridged subwoofer channel) when system space is limited.

Rated power (14.4V, 1% THD): 75W x 4 @ 4 / 100W x 4 @ 2 / 200W x 2 bridged @ 4
Minimum speaker load: 2 per channel (stereo) / 4 bridged
Frequency response: 12 Hz 22 kHz (+0, -1 dB)
Crossovers: selectable High-Pass or Low-Pass per channel pair, 12 dB/octave, variable 50 Hz
Technology: JL Audio NexD switching design for high efficiency and low distortion
Protection: Advanced Rollback Protection helps reduce thermal shutdown events
Connections: RCA inputs with pass-through preamp outputs for system expansion
Installation note: 4 AWG power/ground wiring and 40A fused protection are commonly recommended (installer supplied)
Approx. dimensions: 8.52" W x 7.09" D x 2.05" H

OEM reference: JL Audio M400/4. Supplier: Recmar (Recambios Marinos).

Compatible add-ons (sold separately): JL Audio HD-RLC remote level control for convenient level adjustment, and JL Audio M600/1 monoblock amplifier for dedicated subwoofer power.

Confirm ratings, specification and fitment before ordering especially speaker/subwoofer impedance and bridged wiring configurations.

Shipping Information

All orders ship from the UK. Orders placed Monday–Thursday before 12:00pm are processed same day. Orders placed Friday after 12:00pm through Sunday are processed the following Monday. Processing times vary by stock location.

Out of stock items can be back-ordered with a typical 3–4 week lead time.

If an item shows "Dispatch Available Today" and you order after 2pm UK time, processing begins the next business day.

All times are in UK BST.

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