JL Audio MediaMaster MM55 Marine 3-Zone Source Unit 010-03365-00 (99975)

JL Audio MediaMaster MM55 is a compact, weatherproof marine and powersports digital media receiver built for real open-air duty. A full-color 2.8" LCD, three audio zones, and intuitive rotary controls give you helm-friendly operation while the chassis, electronics, and user interface are engineered specifically for boats, UTVs, and other 12-volt platforms.

Behind the faceplate, the MM55 uses a Class-D 25W x 4 amplifier (2Ω-stable) to drive primary zones directly, plus nine 4V preamp outputs with selectable fixed/relative modes to feed JL amplifiers in larger systems. Integrated high-/low-pass crossovers, per-zone tone and volume limits, and IP67-rated construction, combined with AM/FM/DAB+, Bluetooth with aptX, USB audio, AUX, and NMEA 2000® connectivity, make it a true OEM-plus system controller rather than a generic head unit.

Key Features

• Weatherproof marine/powersports digital media receiver (no CD mechanism)
• Built-in Class-D amplifier: 25W RMS x 4 @ 4Ω (2Ω-stable)
• Three independent audio zones, each with its own subwoofer output and controls
• Nine channels of 4V preamp outputs (front/rear/sub per zone)
• 2.8" full-color TFT LCD with day/night brightness controls for screen and keys
• AM/FM/DAB+ tuner with RDS and up to 18 stored presets
• Bluetooth® audio streaming (A2DP/AVRCP) with SBC and aptX™ codec support
• Rear USB 2.0 input for thumb drives and digital audio (with 1A device charging)
• Rear stereo RCA AUX input with selectable input sensitivity
• NMEA 2000® network-ready for integration with compatible marine displays and JL remotes
• IP67-rated construction, designed for real-world marine and powersports environments

Technical Specifications