Description
JL Audio JLA-010-03103-00 MHD Marine Amplifier - 5 Channel Full-Range Marine System Amplifier
Complete marine audio solution with integrated subwoofer power — MHD 5-channel amplifier delivers 100 watts per speaker plus 500-watt dedicated subwoofer channel with Class-D efficiency and IP67 protection for single-amplifier system installations across Australian offshore vessels.
Product Overview
The JL Audio MHD 5-channel marine amplifier delivers complete audio system amplification from single chassis with 100 watts RMS per channel across four main speaker outputs (75W @ 2Ω) plus dedicated 500-watt RMS subwoofer channel for total 900-watt continuous power output. Designed with full IP67 dust and water ingress protection, this Class-D amplifier features independent high-pass filters for main channels (50-500 Hz, 12/24 dB slopes) and low-pass filter for subwoofer channel with defeatable 30 Hz infrasonic protection. Operating across 11-14.5V DC voltage range with switchable 2/4/6 channel input modes, optional HD-RLC remote subwoofer level control, and buffered pass-through preamp outputs, the compact chassis (273mm x 199mm x 49mm) simplifies installation by eliminating need for multiple amplifiers in complete speaker-plus-subwoofer marine audio systems. Compatible with JL Audio MediaMaster source units, M3/M6 marine speakers, marine subwoofers, and enclosed tower systems, this single-amplifier solution serves recreational boats, fishing vessels, and center console applications requiring professional system integration with three-year warranty coverage.
Features & Benefits
Complete Single-Amplifier Solution: Integrated 4-channel speaker amplification (100W x 4 @ 4Ω) plus dedicated 500W monoblock subwoofer channel eliminates need for separate speaker and subwoofer amplifiers, simplifying installation, reducing equipment costs, and minimizing space requirements in helm consoles and equipment compartments.
Dedicated Subwoofer Channel Architecture: Independent 500-watt monoblock subwoofer output with dedicated low-pass filter (50-500 Hz, 12/24 dB slopes), defeatable 30 Hz infrasonic protection, and HD-RLC remote level control compatibility enables precise bass management separate from main speaker channels optimizing low-frequency performance.
Complete IP67 Environmental Protection: Full dust and water ingress protection withstands direct saltwater spray, submersion during washdown, bilge water exposure, and harsh marine conditions without requiring additional protective enclosures, ensuring reliable operation in demanding Australian coastal and offshore environments with three-year warranty coverage.
Advanced Class-D Efficiency: High-efficiency Class-D topology delivers 900 watts total continuous output while minimizing heat generation and electrical system strain, reducing current draw from vessel batteries and enabling compact chassis design fitting tight installation spaces common in marine equipment compartments.
Independent Channel Processing: Main channels (1-4) feature high-pass only filtering protecting speakers from damaging low frequencies, while subwoofer channel provides low-pass filtering with infrasonic protection, enabling optimal frequency distribution between full-range speakers and dedicated subwoofer without requiring external crossovers or processors.
Flexible Input Configuration: Switchable 2/4/6 channel input modes accommodate stereo source units, multi-zone installations, or bi-amped configurations, while buffered pass-through preamp outputs enable daisy-chaining additional amplifiers for expanded systems requiring tower speakers, cabin zones, or additional subwoofers.
Technical Specs
| Specification |
Details |
| Model |
MHD 5-Channel (12V System) |
| Amplifier Class |
Class-D |
| Channels |
5-channel (4 main + 1 subwoofer) |
| Total Power Output |
900W RMS continuous |
| Main Channels @ 4Ω |
100W x 4 (14.4V input, <1% THD) |
| Main Channels @ 2Ω |
75W x 4 (14.4V input, <1% THD) |
| Subwoofer Channel @ 4Ω |
500W x 1 (14.4V input, <1% THD) |
| Subwoofer Channel @ 2Ω |
500W x 1 (14.4V input, <1% THD) |
| Operating Voltage |
11-14.5V DC (12V systems) |
| Physical Dimensions |
273mm W x 199mm D x 49mm H (10.74" x 7.85" x 1.93") |
| Weight |
3.11 kg (6.85 lbs) |
| Dust/Water Rating |
IP67 (full protection) |
| Signal-to-Noise Ratio |
>108.5 dB below rated power (A-weighted) |
| Damping Factor @ 4Ω |
>400 at 50 Hz |
| Damping Factor @ 2Ω |
>200 at 50 Hz |
| THD+N (Main Channels) |
<0.03% @ 4Ω |
| THD+N (Sub Channel) |
<0.05% @ 4Ω |
| Frequency Response (Main) |
12 Hz - 28 kHz (+0, -1dB) |
| Frequency Response (Sub) |
12 Hz - 10 kHz (+0, -1dB) |
| Input Voltage Range |
Switchable: 200mV-2V RMS (low) or 800mV-8V RMS (high) |
| Main Channels Filter |
High-pass only (50-500 Hz, 12/24 dB) |
| Subwoofer Filter |
Low-pass only (50-500 Hz, 12/24 dB) |
| Infrasonic Filter |
30 Hz, defeatable (subwoofer channel) |
| Crossover Controls |
Detented calibrated potentiometers |
| Channel Input Mode |
Switchable 2/4/6 channels |
| Preamp Outputs |
Buffered pass-through |
| Remote Level Control |
Optional HD-RLC (subwoofer channel only) |
| Fuse Rating |
60 amps |
| Recommended Fuse Type |
AFS, AGU, or MaxiFuse |
| Power Wire Gauge |
Minimum 4 AWG copper |
| Warranty |
3 years manufacturer warranty |
Compatible With / Goes Well With
JL Audio Marine Speakers: M3 marine speakers (6.5", 7.7", 8.8" coaxials), M6 marine speakers (6.5", 7.7", 8.8" coaxials), M3/M6 enclosed tower speakers receiving 75-100W RMS per speaker across four main channels for complete full-range reproduction.
JL Audio Marine Subwoofers: M3 marine subwoofers, M6 marine subwoofers (8" and 10"), M6 marine thin-line subwoofers, M7 marine subwoofers receiving dedicated 500W RMS monoblock power from integrated subwoofer channel with optimized low-pass filtering and infrasonic protection.
JL Audio Source Units: MediaMaster 105 marine stereo, MediaMaster 55 marine stereo (MM55 and MM55-HR models), JL Audio marine receivers with 4-volt preamp outputs providing high-voltage signal transmission for optimal noise rejection and six-channel audio distribution.
Tower Speaker Systems: JL Audio VeX enclosed tower systems, M3/M6 enclosed tower speakers powered from main channels or connected via pass-through preamp outputs to additional amplifiers for expanded multi-zone installations.
Installation Accessories: Marine-grade amplifier wiring kits (4-gauge minimum), 60A fuses (AFS/AGU/MaxiFuse), marine distribution blocks, HD-RLC remote subwoofer level control, waterproof RCA cables, sealed wire connectors for professional complete-system integration.
Frequently Asked Questions
Why choose a 5-channel amplifier instead of separate speaker and subwoofer amplifiers? The 5-channel design simplifies installation by consolidating all amplification into single chassis, reducing equipment costs, minimizing space requirements, eliminating redundant power/ground wiring, and providing matched amplification characteristics across entire audio system. Ideal for boats where space and simplicity are priorities.
Can I use the main channels to power four speakers plus add more speakers later? Yes, the buffered pass-through preamp outputs enable connection of additional amplifiers for tower speakers, cabin zones, or expanded systems. The main four channels directly power your primary speaker set while preamp outputs feed signals to external amplifiers for system expansion.
How does the subwoofer channel differ from bridged 4-channel amplifiers? The dedicated subwoofer channel provides true monoblock architecture with optimized low-frequency performance (12-10 kHz response), dedicated low-pass filtering, defeatable 30 Hz infrasonic protection, and independent remote level control—features unavailable in bridged 4-channel configurations delivering inferior subwoofer performance.
What's the advantage of IP67 rating over standard marine amplifiers? IP67 provides complete protection against dust ingress and submersion up to 1 meter for 30 minutes, exceeding typical marine "water-resistant" ratings. This enables installation in exposed locations, bilge areas, or equipment compartments subject to washdown without additional protective enclosures.
Can the HD-RLC remote control adjust both speaker and subwoofer levels? No, the HD-RLC on 5-channel models controls subwoofer level only, allowing convenient bass adjustment from helm or cockpit positions without affecting main speaker volumes. This is the most common use case—adjusting bass output without touching overall system volume.
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