BOSS Audio Systems MGR350B Marine Gauge-Style Bluetooth Stereo Receiver with Built-In 4-Channel Amplifier

The BOSS Audio Systems MGR350B is a marine gauge-style stereo receiver built for boats, ATVs, and other powersport applications where standard in-dash head units will not fit or survive the environment. Its compact, round gauge profile mounts into a standard gauge cutout using the included metal bracket, hexagon mounting studs, and M4 secure nuts, making it a practical option where panel space is limited. The receiver streams audio wirelessly via Bluetooth from a smartphone or MP3 player, giving direct control over apps like Spotify and Pandora, and also accepts a 3.5mm auxiliary input for wired devices. A USB port supports both playback from connected audio files and device charging, so a phone can stay powered while streaming music.

Weatherproofing is built into the unit rather than added on, with front panel UV coating and a conformal-coated PC board that carry an IPX6 rating against splashing water, making the MGR350B suitable for open boats and other exposed helm locations. It includes a built-in 4-channel amplifier rated at 240 watts total output (60 watts x 4 channels), along with front, rear, and subwoofer pre-amp RCA outputs for connecting external speakers or a subwoofer. This is a receiver only, with no CD or DVD player, keeping the unit compact and further reducing points of water or dust intrusion. The finish is black to match typical marine dash and gauge cluster styling.

Specifications

• Brand: BOSS Audio Systems
• Manufacturer Part Number: MGR350B
• Connectivity: Bluetooth, USB, 3.5mm Auxiliary Input
• Compatible Devices: Amplifier, Smartphone, Speaker
• Number of Channels: 4
• Output Power: 240 Watts total (60 Watts x 4 channels)
• Special Features: Built-In Bluetooth, USB Charging, Weatherproof, No CD/DVD Player
• Water Resistance Rating: IPX6
• Connector Type: RCA (front, rear, and subwoofer pre-amp outputs)
• Color: Black
• Product Dimensions: 3.86 inches D x 3.54 inches W x 3.54 inches H
• Weight: 2 pounds
• Mounting Hardware Included: Metal bracket, hexagon mounting studs, M4 secure nuts
• UPC: 791489122979

Frequently Asked Questions

Does the BOSS Audio MGR350B play music from a phone wirelessly? Yes, the MGR350B streams audio over Bluetooth from a smartphone or MP3 player, giving direct control over apps such as Spotify and Pandora.

Is the MGR350B waterproof enough for an open boat? The MGR350B carries an IPX6 rating from its front panel UV coating and conformal-coated PC board, which protects it against splashing water on an open helm.

What are the dimensions of the MGR350B receiver? The MGR350B measures 3.86 inches deep by 3.54 inches wide by 3.54 inches high, sized to fit a standard round gauge cutout.

How much does the MGR350B weigh? The MGR350B weighs 2 pounds.

Does the MGR350B have a CD or DVD player? No, the MGR350B is a gauge-style receiver only and does not include a CD or DVD player.

How many channels and how much power does the MGR350B put out? The MGR350B has a built-in 4-channel amplifier rated at 240 watts total output, or 60 watts per channel.

Can the MGR350B charge a phone through USB? Yes, the USB port on the MGR350B supports both audio playback and charging a connected device.

What mounting hardware comes with the MGR350B? The MGR350B ships with a metal mounting bracket, hexagon mounting studs, and M4 secure nuts for installation into a gauge cutout.

Can I connect external speakers or a subwoofer to the MGR350B? Yes, the MGR350B provides front, rear, and subwoofer RCA pre-amp outputs for connecting external speakers or a powered subwoofer.

What color is the BOSS Audio MGR350B? The MGR350B has a black finish.

Is there a wired audio input option on the MGR350B besides Bluetooth? Yes, the MGR350B includes a 3.5mm auxiliary input for connecting smartphones or MP3 players by cable in addition to Bluetooth streaming.