Gravity MGR3 Weatherproof Marine Stereo Receiver

The Gravity MGR3 is a compact weatherproof marine stereo receiver for boats, ATVs, motorcycles, RVs, and other outdoor-focused audio installations. It combines source selection, radio reception, Bluetooth streaming, and four-channel speaker output in one dashboard-style unit. This makes it a practical replacement or upgrade for systems that need flexible playback options in exposed environments.

Its listed 200-watt maximum output is configured as 50 watts across each of four channels, allowing it to operate a basic multi-speaker setup without a separate amplifier. Bluetooth provides cable-free music streaming from a compatible phone or media device, while USB, SD, AUX, and FM radio offer alternate listening sources. The front-panel controls and included remote provide two ways to manage playback and sound settings.

The MGR3 is designed for outdoor and marine-oriented use, with IPX5 water resistance and a dustproof construction. Its compact, square-faced layout helps it fit applications where conventional full-size vehicle receivers may not be suitable. Electronic anti-shock support is also listed to help maintain more consistent playback in vibration-prone applications.

Sound adjustment is handled through the built-in equalizer, with Rock, Pop, Classical, and Flat presets available. RCA audio signal output supports connection to compatible external audio equipment, including an amplifier or subwoofer setup. That gives the receiver a straightforward path for expanding a basic speaker system over time.

With its multiple playback formats and weather-oriented design, the MGR3 suits recreational vehicles that need music access without relying on a single source. It is especially appropriate for installations where Bluetooth convenience, FM listening, and removable-media playback are all useful. Confirm mounting clearance, wiring needs, antenna requirements, and speaker compatibility before installation.

Key Features

• Four-Channel Output: Listed 50W x 4 output supports a basic multi-speaker system.
• Bluetooth Streaming: Plays audio wirelessly from compatible Bluetooth-enabled devices.
• Multi-Source Playback: Supports USB, SD, AUX, and FM listening options.
• IPX5 Water Resistance: Built for wet outdoor and marine-oriented environments.
• RCA Signal Output: Enables connection to compatible external audio components.
• Included Remote Control: Provides convenient playback and settings control from a distance.

Design & Installation

The MGR3 uses a compact black front panel with an integrated display, tactile source and tuning controls, and a rotary power/selection control. Its weatherproof, dustproof design is intended for installations exposed to outdoor conditions, while the rear chassis uses a finned metal housing. The receiver is listed with IPX5 water resistance; protect connections and media ports appropriately in wet installations.

Allow approximately 4.33 inches at the front face, 3.92 inches of mounting depth, and 2.89 inches for the chassis profile when planning placement. Connect compatible speakers to the four-channel output, connect an FM antenna for radio use, and use the RCA signal output only with compatible external equipment. Use the USB, SD, AUX, Bluetooth, and FM modes according to the playback source available in the vehicle or vessel.