JL Audio MediaMaster 55 Marine Source Unit, NMEA 2000 Certified, 10-16V, IP67, 3-Zone Audio, Bluetooth, 2.8 in Color LCD

Overview

The JL Audio 010-03365-00 is a weather-resistant marine source unit with a 2.8-inch TFT full-color display (320 x 240) and three audio zones for independent control around the boat. The front-panel design is IP67-rated for spray, washdowns, and open-cockpit use, and it runs on 10 to 16 V DC electrical systems.

For speaker power, it includes a built-in amplifier rated at 25W x 4 at 4 ohms for Zones 1 and 2, with a 2 ohm minimum per channel when your system requires it. Each zone also supports RCA preamp outputs with a stereo pair plus a dedicated mono subwoofer output, letting you mix powered zones and external amps without having to compromise the layout.

Sources cover the usual onboard mix: Bluetooth (with SBC and Qualcomm aptX audio), USB 2.0, and an analog AUX input, plus AM/FM tuning with RDS and 18 presets. NMEA 2000 networking is built in via a Micro-C connection (LEN 1) for integration with compatible displays and network remotes.

Key features

• IP67-rated face and controls for marine exposure and routine washdowns
• 2.8-inch TFT color display with 320 x 240 resolution for at-helm visibility
• Three-zone audio architecture with per-zone stereo preamp outputs and a mono subwoofer output
• Built-in amplification for Zones 1 and 2: 25W x 4 at 4 ohms, with 2 ohm minimum per channel
• System-friendly power requirements: 10 to 16 V DC input, 15 A max draw, 15 A fuse value
• Bluetooth audio plus USB 2.0 playback with up to 1 A device charging
• NMEA 2000 connectivity on a Micro-C port (LEN 1) for network integration

Installation and fit

This unit is meant for a flush helm or console install. The mounting hole size is 3.74 in wide x 3.15 in high (95 mm x 80 mm), and the overall chassis measures 4.65 in x 3.74 in x 3.66 in (118 mm x 95 mm x 93 mm). Before cutting, confirm you have room behind the panel for the chassis depth and for cable bend radius on power, speaker leads, RCA outputs, antenna, and network connections.

Electrical and system integration

Plan it like a 12 V-class device: operating voltage is 14.4 V DC nominal (10 to 16 V range) with up to 15 A current draw, so it should be fed from a properly protected circuit using the specified 15 A fuse. If you are pairing it with external amplifiers, the 4V RMS preamp output setting (Relative or Absolute modes) can help keep gain structure clean when runs are long and the environment is noisy.

For networked boats, the NMEA 2000 Micro-C connection lets the source unit participate on the backbone. Keep backbone power and termination correct, and avoid spurs that are longer than your network design allows so control stays responsive underway.

Audio setup on board

The three-zone layout is handy when the cockpit, cabin, and bow need different volume levels or different content. Each zone includes tone and balance controls plus selectable high-pass filtering (Off, 80 Hz, 100 Hz, 120 Hz) and low-pass filtering for subwoofer outputs (Off, 60 Hz, 80 Hz, 100 Hz), which helps you keep deck speakers clean while letting subs do the low end.

This is a good match for boats that have multiple listening areas and want one head unit that can manage them without extra zone processors. It also fits well in refits where you are upgrading from a single-zone stereo but want to keep existing amps and speakers while adding better control and tuning.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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