JL Audio JLA-010-03105-00 MX280/4 Marine Amplifier - 4 Channel Full-Range Amplifier

JL Audio JLA-010-03105-00 MX280/4 Marine Amplifier - 4 Channel Full-Range Amplifier

Ultra-compact IPX7 waterproof marine amplifier delivering 280 watts across four channels for complete full-range speaker systems.

Product Overview

The JL Audio MX280/4 Marine Amplifier (JLA-010-03105-00) represents the most compact solution for powering complete 4-channel marine and powersports audio systems, combining 280 watts of clean power with full IPX7 waterproof protection in an incredibly small chassis. This 4-channel Class D amplifier delivers 70 watts per channel at 2 ohms, providing ample power for helm speakers, cockpit zones, tower speakers, or multi-zone systems in a unit measuring just 8.66" x 1.77" x 3.09". The IPX7 rating ensures complete protection against water immersion up to 1 meter for 30 minutes, making it ideal for harsh marine environments, open boats, jet skis, UTVs, and powersports vehicles where exposure to splashing, rain, and moisture is constant. Built-in crossovers with adjustable frequencies and switchable channel input modes enable precise system tuning without external processors. The ultra-low profile and lightweight design (3.18 lbs) allow mounting in locations impossible for conventional amplifiers, while requiring only 8 AWG wiring and a 35A fuse for simplified installation. Marine-grade construction ensures long-term reliability in saltwater conditions.

Features & Benefits

The 4-channel configuration delivers 70 watts RMS per channel at 2 ohms, providing clean, powerful amplification for complete speaker systems in boats, UTVs, side-by-sides, and powersports vehicles. Full IPX7 waterproof rating protects against complete water immersion, far exceeding splash-resistant ratings, ensuring reliable operation even when fully submerged temporarily during washdowns, heavy weather, or water sports activities. Ultra-compact dimensions (8.66" x 1.77" x 3.09") make this the smallest 4-channel marine amplifier available, enabling installation behind dash panels, under seats, in storage compartments, or directly exposed in engine bays where larger amplifiers cannot fit. Class D efficiency minimizes heat generation, eliminating the need for bulky heatsinks or active cooling systems. Built-in 12 dB/octave crossovers on all channels allow independent high-pass or low-pass filtering (35-300 Hz range), enabling flexible system configurations including front/rear full-range, or bridged mode for higher power output to larger speakers. Bridging capability creates two 140-watt channels at 4 ohms for driving larger tower speakers or subwoofers. Switchable channel input mode allows 2, 3, or 4-channel input configuration for maximum system flexibility. Reduced electrical requirements with 8 AWG wiring and 35A fuse simplify installation compared to higher-power amplifiers. Power and signal connections via pigtail design with no exposed terminals enhance waterproofing integrity.

Technical Specifications

Compatible With / Goes Well With

JL Audio Marine Speakers: M3 Marine Speakers (coaxial or component systems), M3 Enclosed Tower Speakers for multi-zone amplification with independent crossover control per pair

JL Audio Source Units: MediaMaster 55 Stereo, MediaMaster 105 Stereo, JL Audio Receivers for signal source and system control

Powersports Applications: Polaris RZR Stealthbox systems (SB-POL-RZG2SPKR/M3-650i), compatible with UTV, ATV, side-by-side, and motorcycle audio systems requiring compact 4-channel amplification

Installation Requirements: 8 AWG copper power and ground wiring, 35A fuse (AFS/AGU/MaxiFuse), 2-ohm stable speakers for maximum power output, optional additional monoblock amplifier for dedicated subwoofer channel

Frequently Asked Questions

How does the MX280/4 compare to the larger MX600/3 for a complete boat audio system? The MX280/4 provides four independent channels (70W each) ideal for front/rear speaker configurations or multi-zone systems, while the MX600/3 provides two speaker channels plus a dedicated high-power subwoofer channel. Choose the MX280/4 when you need four separate speaker zones without a subwoofer, or when you plan to add a separate monoblock for subwoofer duties. Choose the MX600/3 for integrated speaker and subwoofer amplification in one unit. The MX280/4 is also smaller and requires lighter wiring (8 AWG vs 4 AWG).

Can I bridge channels to power tower speakers or a subwoofer? Yes, bridge channels in pairs to create two 140-watt outputs at 4 ohms. This is perfect for powering two large tower speakers (bridge Ch 1-2 and Ch 3-4), or bridge one pair for a subwoofer while using the remaining two channels for full-range speakers. When bridging, connect positive to one channel and negative to the adjacent channel, ensuring 4-ohm minimum load per bridged pair.

What makes IPX7 rating critical for marine and powersports applications? IPX7 certification means the amplifier survives complete submersion in 1 meter of water for 30 minutes, not just light splashing. This is essential for installations in open boats, personal watercraft, jet skis, or UTVs where the amplifier may be fully exposed to waves, heavy rain, pressure washers during cleaning, or accidental submersion. Standard amplifiers with lower IP ratings will fail in these conditions, while the MX280/4 continues operating reliably.

Why would I choose the MX280/4 over a standard car amplifier for my boat? The IPX7 waterproofing is the primary advantage, along with marine-grade corrosion-resistant construction designed for saltwater environments. The ultra-compact size (8.66" x 1.77" x 3.09") enables installation in locations where standard amplifiers won't fit. The pigtail connection design with no exposed terminals maintains waterproof integrity. Standard car amplifiers lack waterproofing, corrode rapidly in marine environments, and typically require significantly more mounting space.

How do the switchable channel input modes work and what configurations are possible? The input mode switch configures how signals feed the amplifier. In 2-channel mode, the front input pair feeds all four channels (ideal for stereo sources). In 3-channel mode, typically used with front/rear/sub source outputs. In 4-channel mode, each input pair feeds its corresponding amplifier channels independently for maximum flexibility with 4-channel source units. This flexibility accommodates various head unit configurations without requiring external summing devices or Y-adapters.