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Description
Jl Audio Mediamaster 55 Weatherproof Source UnitJL Audio MediaMaster 55 Premium, Compact Marine Source Unit with Full color LCD Model: MM55 Rugged (IP67 rated) design to withstand the elements, with all buttons sealed behind a watertight membrane Bright and easy to read 2. 8 inch (71 mm) full color LCD with a high contrast design for enhanced viewing while in motion Intuitive interface with backlit controls for easy operation day or night Independent settings for day and night lighting with
JL Audio MediaMaster 55 Premium, Compact Marine Source Unit with Full-color LCD
Model: MM55- Rugged (IP67-rated) design to withstand the elements, with all buttons sealed behind a watertight membrane
- Bright and easy-to-read 2.8-inch (71 mm) full-color LCD with a high-contrast design for enhanced viewing while in motion
- Intuitive interface with backlit controls for easy operation day or night
- Independent settings for day and night lighting with separate brightness controls for the display, buttons and optional wired remotes
- Nine channels of audiophile-quality preamp outputs (4-volt RMS) from three separate audio zones, each with a dedicated subwoofer output
- Independent feature and control options for each audio zone:
- Built-in amplifier generates 100 watts (25 watts x 4) of high-fidelity sound for zones 1 and 2
- Digital AM/FM radio tuner with radio data system extended display info
- Built-in DAB+ radio (Europe) tuner (subject to local availability)
- Store up to 18 favorite stations (across all tuners) for quick selection
- Stream audio with BLUETOOTH wireless technology and the Qualcomm® aptX™ audio codec for amazing audio fidelity with compatible devices
- USB 2.0 direct-digital connections can access music files on your USB storage device with 1 amp charging output
- Auxiliary inputs accept analog audio signals directly from external sources
- NMEA 2000 network-certified: MFD control functionality uses applicable network cables and connectors (sold separately)
MediaMaster 55 is a premium, compact marine source unit engineered to deliver high-fidelity sound and advanced audio features for all your maritime adventures.
Constructed with a tough, water-resistant (IP67-rated) design, this single-chassis receiver features a bright 2.8-inch (71 mm) full-color display and an intuitive interface with backlit controls for easy operation day or night. A variety of source and media options are on board for uninterrupted listening of your favorite stations and playlists, including global radio tuners, a USB input, analog AUX input and streaming audio capabilities, courtesy of BLUETOOTH® wireless technology.
Audio output options include a robust 4-channel onboard amplifier, capable of powering your speakers with 100 watts (25-watts RMS x 4) of pure sonic delight. Nine channels of audiophile-quality preamp outputs from three separate audio zones are also included, each with a dedicated subwoofer output. Each zone includes an array of flexible audio options and is controlled by a configurable master volume knob for quick, on-the-fly adjustments, allowing complete command over different areas of your boat.
The MediaMaster 55 marine source unit also includes certified NMEA 2000® network connectivity, making it an ideal companion for use with your Garmin, Lowrance, Raymarine or Simrad multifunction display (MFD).
Specifications| General Specifications | |
| Input Operating Voltage | 10 - 16 VDC |
| Standby Current Draw | 100 mA |
| Operating Current Draw | 15 A |
| Recommended Fuse Value | 15 A |
| Remote Turn-on Capacity | 500 mA (max) |
| Operating Temperature Range | -4 F to +149 F (-20 C to +65 C) |
| Display Size / Type | 2.8"" / TFT LCD backlighted |
| Display Resolution | 320 x 240 |
| Output Channels | One stereo pair and mono subwoofer RCA plugs per zone |
| Output Zones | Relative, Absolute, Fixed or Off |
| Maximum Output Voltage | 4V RMS (Relative or Absolute), Selectable 4V/2V/1V RMS (Fixed) |
| 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 host |
| Maximum Current Output | 1 A |
| Physical | |
| Width | 4.65 in / 118 mm |
| Height | 3.74 in / 95 mm |
| Depth | 3.66 in / 93 mm |
What's in the Box:
- MM55 MediaMaster
- Flush Mount Gasket
- Flush Mount Template
- Sun Cover
- Powercord
- #8 x 1in Screw x 4
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
Title: Reliable, Easy-to-Use, and Worth Every Penny
Style: 32 oz
I’ve been using Slime tire sealant for my fat tire e-bike, and I can say with confidence that this product delivers exactly what it promises. The application is simple, the results are consistent, and the peace of mind it provides is invaluable. For anyone who rides regularly — whether for commuting, recreation, or deliveries — this is a product that pays for itself many times over.
The first thing I appreciate about Slime is how easy it is to install. The bottle is well-designed, the instructions are clear, and the process takes just a few minutes. You simply deflate the tire, remove the valve core, squeeze in the recommended amount, reinstall the valve core, inflate, and spin the wheel to distribute the sealant evenly. No special tools, no mess, and no guesswork — just a straightforward, user-friendly process.
Performance-wise, Slime does exactly what it’s supposed to do: seal punctures quickly and effectively. I’ve had nails, thorns, and sharp debris puncture my tires while riding, and in every case where the leak was within the tread area, Slime sealed it instantly. There’s something incredibly reassuring about hearing that faint hiss of air for a second, then watching it stop as the sealant does its job. It’s a real-time reminder that this product is actively protecting you from being stranded.
What sets Slime apart from other sealants I’ve tried is its durability. Once applied, it stays active inside the tube for months, ready to respond to new punctures as they happen. It doesn’t dry out quickly, it doesn’t clump up, and it doesn’t cause balance issues with the tires. For someone who rides almost daily, that reliability is a huge plus.
Another thing I respect about this product is that it’s non-toxic and environmentally friendly. If a bit of sealant escapes during a repair, I don’t have to worry about it harming the environment. It’s also water-soluble, making cleanup easy if I ever need to replace a tube or tire. That attention to safety and sustainability shows that the company isn’t just making a great product — they’re doing it responsibly.
The value for the price is excellent. One bottle goes a long way, and when you factor in the cost of replacing tubes, paying for roadside repairs, or even the inconvenience of being late because of a flat, Slime is an investment in both savings and peace of mind. For delivery riders like me, it’s especially valuable — every flat avoided means another day of work uninterrupted.
In short, Slime is one of those rare products that I can recommend without hesitation. It’s easy to use, effective, long-lasting, and backed by a company that clearly understands the needs of cyclists and e-bike riders. It has already saved me from countless headaches, and I plan to keep a bottle on hand at all times. If you ride regularly and haven’t tried it yet, you’re taking an unnecessary risk — this is one of the best preventative tools you can add to your maintenance kit.
Verdict: Five stars for performance, ease of use, and overall value. Slime is a must-have for any serious rider who values reliability and wants to keep rolling no matter what’s on the road.
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Reviewed in the United States on August 11, 2025
★★★★★ 4
Slime is good, pump is a disaster
Style: 1 gal, Style: 1 gal
The only reason I am giving this a 4 star(not zero) rating is the slime itself. The actual pump on the 1 gallon canister is awful. It makes so much mess, so I do not know whether I pumped the slime into the tubes or it all just spilled out of the base of the pump. The bottles worked great, but this time I needed to use more slime for a bunch of tires. What a slimy mess that was. Very poor pump design. Only after I spilled who knows how much of the slime, I finally washed it and was able to see the problem. The cap at the base of the pump got unscrewed and let all the slime lose. I screwed it back up and this should fix the mess next time I use it. Just a heads if someone encounters the same issue.
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Reviewed in the United States on April 22, 2026
★★★★★ 5
Great product
Style: 16 oz
Worked as advertised. I would order again.
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Reviewed in the United States on May 29, 2026
★★★★★ 5
Fixes flats and old tires like a charm
Style: 1 gal
This stuff is awesome. If you have tractor tires, ATV tires, bike, tires, hell, any tires that hold air. This stuff is awesome. Awesome. Awesome. It does not work for highway vehicles, i.e. Cars and truck trucks. But anything else it’s great. Dollies, air compressors, wheelbarrows, the stuff is awesome dude.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
slime is and has always been amazing for bike tires and other small pneumatic tires
Style: 1 gal
this is a great value, I have been using slime in my tubes of my bikes and a small inflatable pneumatic tires for probably 30 years, and I can say slime has only improved, and it works fantastic, this is a very good way to save money, and it works great on goat heads and several other ways your tires can get punctured, I still always recommend carrying a small air compressor or pump, but for the price point you just cannot beat slime, every bike shop should always carry this.
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Reviewed in the United States on April 18, 2026