JL Audio MM55-HR Hidden Marine Source Unit w/ 4-Channel Amp 010-03372-00 (99977)

JL Audio MediaMaster MM55-HR is a premium hidden marine source unit with a built-in 4-channel amplifier and multi-zone control, designed for vessels where the “brain” of the system is tucked away and controlled from remote locations or an MFD. It delivers high-fidelity audio, full 3-zone management, and extensive connectivity while keeping the dash clean and focused on helm controls.

This hideaway receiver includes a 25W x 4 (100W total) built-in amplifier for Zones 1 and 2, plus nine channels of 4V preamp outputs across three audio zones, each with its own dedicated subwoofer output. With Bluetooth® streaming, global AM/FM tuner, USB audio, analog AUX input, and NMEA 2000® network connectivity, the MM55-HR is built to be the centralized audio hub for serious marine systems.

Key Features

• Premium hidden marine source unit with built-in 4-channel amplifier
• Up to three independent audio zones, each with its own subwoofer output
• Nine channels of 4V preamp outputs (front/rear/sub per zone)
• Integrated Bluetooth® audio streaming with high-fidelity codec support
• Global AM/FM tuner with preset storage
• Rear USB 2.0 input for music files and device charging
• Rear stereo AUX RCA input for external sources
• NMEA 2000® compatible for control via supported MFDs or JL network remotes
• IP67-rated water-resistant design for real marine environments

Technical Specifications