MARINE SOURCE UNIT
OWNER’S MANUAL
FCC COMPLIANCE STATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must not accept any interference received, including interference that may cause undesired operation. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, the user is encouraged to try to correct the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase separation between the equipment and the receiver.
– Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help.
Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.
FCC RADIATION EXPOSURE STATEMENT
This device complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20 cm between the radiator and any part of your body.
CANADA STATEMENT
This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s licence-exempt RSS(s). Operation is subject to the following two conditions:
(1) This device may not cause interference.
(2) This device must accept any interference, including interference that may cause undesired operation of the device.
The device meets the exemption from the routine evaluation limits in section 2.5 of RSS 102 and compliance with RSS-102 RF exposure, users can obtain Canadian information on RF exposure and compliance. This equipment meets the exemption from the routine evaluation limits in section 2.5 of RSS-102. It should be installed and operated with a minimum distance of 20cm between the radiator and any part of your body.
SAFETY CONSIDERATIONS
- Only use this product in vehicles with 12 volt, negative-ground electrical systems. This product is not certified or approved for use in aircraft.
- Mount this product securely to prevent damage or injury in severe conditions.
- Do not replace the power wire fuse with one of a different value. Never bypass the fuse.
- Listen to your audio system at levels appropriate for operating conditions and hearing safety.
INSTALLATION CONSIDERATIONS
- Installation requires appropriate tools and safety equipment. Professional installation is recommended.
- This product is water-resistant. Do not submerge or subject to high-pressure water spray.
- Before installation, turn off the audio system and disconnect the battery system from the audio system.
- Install in a dry, well-ventilated location that does not interfere with your factory-installed systems. If a dry environment is not available, a location that is not exposed to heavy splashing may be used.
- Before cutting or drilling, check for potential obstacles behind mounting surfaces.
- Carefully route all system wiring away moving parts and sharp edges; secure with cable ties or wire clamps and use grommets and loom where appropriate to protect from sharp edges.
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GENERAL MOUNTING
GENERAL CONNECTIONS
CONTROL PANEL
GENERAL CONTROL FUNCTIONS
| Control | Function | |
 SOURCE |
Source/ Power |
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Volume/ Select |
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SUB |
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Settings |
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Back/ Menu |
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Favorites |
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Mute/ Pause |
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Forward | Short press to:
Long press to:
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Backward | Short press to:
Long press to:
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SUB
SETTINGS
BACK/MENU
FAVORITES|
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| Setting | Function | |
| Name this Device | Create a custom name to display on devices connected with Bluetooth® wireless technology or for NMEA 2000® networks | |
| Audio Zone Setup | Configures each set of audio zone outputs | |
| AUX Input Sensitivity | Configures AUX input sensitivity: 2V or 1V RMS (default) | |
| Diagnostic | Displays serial number, hardware and software version info | |
| Display | Configures display and brightness settings | |
| Battery Monitor | Notifies when +12VDC supply voltage drops below 10 volts or above 16 volts | If triggered, the unit will enter Safe Mode with a message to turn the unit off until normal operating voltage is restored |
| Scrolling Text | Enables continuous scrolling of available RDS/track text info | |
| Tuner Region | Configures AM/FM tuner range/scale for a specific region | |
| Power-up Settings | Configures display and volume settings upon activation | |
| Mobile Application | Access pairing options for mobile device application control | |
| Remote Control | Access pairing options for controllers equipped with Bluetooth® wireless technology | |
| Language | Configures displayed navigation controls and user interface language | |
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| Zone | Function | Setting 1 | Setting 2 |
| Z1: Zone 1 Z2: Zone 2 Z3: Zone 3 |
Level Control Mode | Relative: Links the volume levels of Zones 2 – 3 with the level of Zone 1. (Linked zones will proportionally follow Zone 1’s volume.) Each zone’s offset level is independently adjustable, allowing you to create a customized level controller, specific to a vessel’s layout. | |
| Absolute: Creates an independent level control for selected zones, each with its own separate volume level slider. | |||
| Fixed | 4V RMS Max (default) 2V RMS Max 1V RMS Max |
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| Off | |||
| Rename Zone | Bow, Bridge, Cabin, Cockpit, Galley, Helm, Stateroom 1, Stateroom 2, Tower, Transom | ||
| Custom Name | Alphanumeric Input | ||
| Factory Default | |||
| Max Volume Limit | Max Vol Limit | ||
| HPF | High Pass Filter | Off (default) 80 Hz 100 Hz 120 Hz |
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| Sub 1 Sub 2 Sub 3 |
LPF (Low Pass Filter) | Off (default) 60 Hz 80 Hz 100 Hz |
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AUDIO STREAMING WITH BLUETOOTH® WIRELESS TECHNOLOGY
You may listen to audio wirelessly from up to 35 feet away (11 m) using compatible devices equipped with Bluetooth® wireless technology. Up to eight devices can be paired, but only one streaming device can connect at a time.
SETTINGS FOR DEVICES WITH BLUETOOTH® WIRELESS TECHNOLOGY
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| Setting | Function |
| Now Playing | Return to the Now Playing Screen |
| Pair New Device | Initiates Pairing Mode (connected devices will be disconnected) |
| Connect Paired Device | Display all paired devices for connection |
| Set Primary Device | Assign priority to a paired device for automatic connection |
| Delete a Paired Device | Select from paired devices for removal |
| Delete All Paired Devices | Removes all paired devices from memory |
- Hereby, Garmin declares that the radio equipment type MM55 is in compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address: www.garmin.com/compliance
- MM55 Wireless Specification:
Bluetooth transmitter frequency range: 2400 MHz – 2483.5 MHz
Bluetooth transmitter power: <14 dBm (EIRP)
USB CONNECTIONS
Use the USB port to connect with USB storage class devices (thumb drive, digital audio player, etc.). Includes 1 A charging output.
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| Setting | Function |
| Now Playing | Return to the Now Playing Screen |
| Shuffle | Activate Shuffle: On or Off (default) |
| Repeat | Activate Repeat: All, Song or Off (default) |
| Play All | Plays all content within all folders |
- Properly secure the connected device before driving to prevent damage from dropping or sudden acceleration/braking.
- Control, functionality and display may vary depending on the model and version of the connected device.
- When connected via USB port, make sure to unpair or disable the device’s wireless connection to avoid possible playback conflicts.
- If you experience abnormal performance during operation, disconnect the device and check its condition. Restart your device if performance does not improve.
OPTIONAL CONTROLLER AND INTERFACE ACCESSORIES
The following connections are included for adding accessories (sold separately). Refer to the supplied owner’s manual of each accessory for specific user and installation instructions.
Connection for NMEA 2000® Networks
Micro-C plug permits direct connection to a vessel network using accessory cables and connectors (sold separately).
Note: Functionality requires compatible entertainment protocols (PGN) for NMEA 2000® networks and may require a software upgrade of your multi-function display (MFD). Refer to your MFD manufacturer for device compatibility info.
MediaMaster® MMR-40 Network Controller
Full-function, water-resistant (IP66 rated) controller with full-color LCD display
MediaMaster® MMR-5N2K Network Volume Controller
Water-resistant (IPX7 rated) controller
Multi-Function Display (MFD) Control
Achieve control functionality using your vessel’s multi-function display MFD
MediaMaster® MMA-1-HTML MFD Data Interface
Digital interface generates themed navigation and controls onto your vessel’s multi-function display (MFD)
Connection using Bluetooth® Wireless Technology
Ultra-efficient Bluetooth® Low Energy technology permits wireless control from up to 35 feet (11 m) away. Pair up to eight remotes to a single source unit.
MediaMaster® MMR-25W Wireless Controller
Water-resistant (IP68 rated) controller
MediaMaster® Remote Controller App
Free, full-function, application controller using your compatible wireless device
Note: App functionality may require update of source unit software. Visit: www.jlaudio.com/support
Connection for Wired Remotes
Remote plug permits direct connection of wired controllers using accessory cables and splitters. Add up to three remotes to a single source unit, at up to 75 feet (23 m) away.
MediaMaster® MMR-20-BE Wired Remote Controller
Water-resistant (IP67 rated) controller
SPECIFICATIONS
Electrical
| Operating Voltage | 14.4V DC (10V – 16V) |
| Operating Temp Range | -4 F to +149 F (-20 C to +65 C) |
| Current Draw / Fuse Value | 15 A (max) / 100 mA (standby) / 15 A |
| NMEA 2000® LEN | 1 (Micro-C connector) |
| Display / Resolution | 2.8″ TFT LCD backlighted / 320 x 240 |
Preamp Audio Outputs/Inputs
| Output Channels | One stereo pair and mono subwoofer RCA plugs per zone |
| Output Configuration | Relative, Absolute, Fixed or Off |
| Maximum Output Voltage | Relative or Absolute: 4V RMS Fixed: Selectable 4V/2V/1V RMS |
| Output Impedance | 250 Ω |
| Auxiliary Input | One stereo pair of RCA plugs (2V/1V RMS Input Sensitivity) |
Amplified Audio Outputs
| Rated RMS Power @ 14.4V | 25W x 4 @ 4 Ω |
| Minimum Impedance | 2 Ω per channel |
Sound Control Options
| Tone and Balance | Treble, Midrange, Bass and Balance (all zones) |
| High-Pass Filter | Off, 80 Hz, 100 Hz and 120 Hz (each zone) |
| Low-Pass Filter | Off, 60 Hz, 80 Hz and 100 Hz (each subwoofer zone) |
Tuner
| FM Tuner with RDS | 87.5 MHz to 107.9 MHz (0.2 MHz step) |
| AM Tuner | 530 kHz to 1710 kHz (10 kHz step) |
| DAB+ Tuner | 170 MHz to 230 MHz |
| Favorites | 18 presets across all tuners |
Bluetooth®
| Profile | A2DP v1.2, AVRCP v1.4 |
| Core Specification | Version 2.1 + EDR |
| Codec | SBC, Qualcomm® aptX™ audio |
| Connection Range | Up to 35′ (11 m) |
USB
| Interface | USB 2.0 |
| Maximum Charging Output | 1 A |
| Supported Audio Formats | MP3, MP4, WAV, AAC, M4A, M4B |
Dimensions
| Unit W x H x D | 4.65″ x 3.74″ x 3.66″ (118 mm x 95 mm x 93 mm) |
| Mounting Hole W x H | 3.74″ x 3.15″ (95 mm x 80 mm) |
© 2024 Garmin Ltd. or its subsidiaries
All rights reserved. Garmin reserves the right to change or improve its products and to make changes in the content of this manual without obligation to notify any person or organization of such changes or improvements. For help with your product, go to https://www.jlaudio.com/support.
Garmin®, JL Audio and MediaMaster are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. The JL Audio logo and the MediaMaster logo are trademarks of Garmin Ltd. or its subsidiaries. These trademarks may not be used without the express permission of Garmin.
The BLUETOOTH® word mark and logos are owned by Bluetooth SIG, Inc. and any use of such marks by Garmin is under license. NMEA 2000®, and the NMEA 2000 logo are registered trademarks of the National Marine Electronics Association. Other trademarks and trade names are those of their respective owners.
MM55_MAN-052024.indd 5/20/24 12:45PM
Documents / Resources
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JL AUDIO MM55 Marine Source Unit LCD Display [pdf] Owner's Manual MM55, MM55 Marine Source Unit LCD Display, Marine Source Unit LCD Display, Source Unit LCD Display, LCD Display, Display |
