Alpine MRN-W12S4-IB-LB 12" 4-Ohm Infinite Baffle Marine RGB Subwoofer - Black - Each

Alpine MRN-W12S4-IB-LB 12" 4-Ohm Infinite Baffle Marine RGB Subwoofer - Black - Each - 2026

The Alpine MRN-W12S4-IB-LB brings deep, powerful bass to your marine audio system with 600 watts RMS power handling, long-excursion performance, integrated RGB lighting, and an IP66-certified design built for life on the water. Based on Alpine’s legendary R-Series platform, this 12-inch marine subwoofer is designed to deliver the kind of low-frequency impact that helps your music stay full and energetic whether you’re cruising, relaxing at anchor, or entertaining at the dock.

Powerful 12-Inch Marine Bass

With 600 watts RMS and 1,800 watts peak power handling, the MRN-W12S4-IB-LB gives your system a serious low-end foundation. Its 20 mm Xmax allows the subwoofer to move more air for stronger bass impact, while the 65 mm single voice coil and double-stacked strontium ferrite motor help deliver controlled performance.

The result is bass with plenty of weight and depth. Kick drums hit harder, bass lines sound fuller, and your music gains the low-end presence that marine speakers alone can’t provide.

Built for Infinite-Baffle Applications

The MRN-W12S4-IB-LB is optimized for infinite-baffle installations, using the open space behind the mounting surface rather than requiring a traditional enclosure. It’s a practical approach for marine systems where onboard space is valuable.

Need an enclosure instead? The subwoofer is also compatible with sealed enclosures, while ported enclosures are not recommended. That gives you some flexibility without overcomplicating your system design.

R-Series Performance for the Water

Built on Alpine’s R-Series platform, this subwoofer combines an ultra-rigid polypropylene and carbon-fiber parabolic cone with a High Amplitude Multi-Roll (HAMR) surround. These components are designed to support powerful, controlled bass as the volume rises.

A double-stacked strontium ferrite motor and 65 mm voice coil provide the foundation for its performance, while the 25 Hz–150 Hz frequency response focuses the subwoofer on the low frequencies that add depth and impact to your music.

Marine-Ready Protection

Life on the water can be tough on audio equipment, so the MRN-W12S4-IB-LB is built with marine durability in mind. Its IP66-certified assembly provides dust and water resistance, while the subwoofer has also been tested for salt, fog, UV exposure, and vessel water-tightness.

Waterproof Deutsch connectors are used for both the speaker connection and RGB lighting connection. The included hardware also features the waterproof speaker connector, waterproof RGB connector, six mounting screws, and hex key.

Integrated RGB Lighting

Why settle for great bass when you can add some visual style too? The MRN-W12S4-IB-LB features an integrated 4-pin RGB LED optical-diffusion grille that creates a smooth glow after dark.

The RGB lighting requires a controller and remote, with the Alpine KTX-MRN-LED-RF LED Controller & Remote available separately. Once connected, the lighting can add a subtle accent or a more energetic look to your marine audio setup.

The fixed black grille gives the subwoofer a clean, bold appearance that works especially well with dark interiors, black trim, and modern marine finishes.

Complete Your Alpine Marine Audio System

The MRN-W12S4-IB-LB can be paired with other Alpine Marine components to build a complete system. The M-A110V 5-Channel Marine Amplifier offers a streamlined option for powering speakers and a subwoofer, while the M-A120M 1200-Watt Mono Marine Amplifier provides dedicated bass power for one or two compatible subwoofers.

With its 600 watts RMS of power handling, 20 mm Xmax, infinite-baffle design, marine-ready construction, and integrated RGB lighting, the Alpine MRN-W12S4-IB-LB is designed to give your boat a deeper and more commanding low-end experience without sacrificing the features that matter on the water.

The Alpine MRN-W12S4-IB-LB is a strong choice when you want your marine system to deliver substantial bass while handling the demands of the marine environment. With R-Series performance, 600 watts RMS power handling, infinite-baffle compatibility, IP66 protection, and integrated RGB lighting, it adds both depth and presence to your time on the water.

FAQs

1. What is the power handling of the Alpine MRN-W12S4-IB-LB? The subwoofer handles 600 watts RMS and 1,800 watts peak power.
2. What impedance is the MRN-W12S4-IB-LB? It uses a 4-ohm single voice coil.
3. Does the MRN-W12S4-IB-LB include RGB lighting? Yes, it features an integrated 4-pin RGB LED optical-diffusion grille.
4. Is a controller included for the RGB lighting? No. A compatible controller and remote are required and the KTX-MRN-LED-RF is sold separately.
5. Can the MRN-W12S4-IB-LB be used in an enclosure? Yes. It is compatible with sealed enclosures, but ported enclosures are not recommended.