BOSS Audio Systems MGV520B Marine Gauge Receiver – Weatherproof, 3 Inch LCD, Built-in Amplifier, Bluetooth, Digital Media MP3 Player, No CD Player, USB Port, AM/FM Radio
Quick take
The BOSS MGV520B is a weatherproof marine-gauge receiver designed to bring Bluetooth streaming, USB playback, and AM/FM radio to off-road vehicles or marine setups without a CD mechanism. Buyers generally like the loud, clear sound and quick Bluetooth pairing, but the biggest caveat is fit-and-install dependency, plus limited evidence around long-term reliability from some reviewers.
Pros and cons
Pros
- Bluetooth for wireless control and music streaming from a phone or compatible apps.
- Weatherproof construction with an IPX6 rating (built for splashing water).
- Built-in amplifier (60 watts x 4) and multiple pre-amp outputs for speakers or a subwoofer.
- 3-inch LCD display with easy-to-use controls (including a dial-style volume control mentioned by buyers).
Cons
- The accessory “start” button requires a relay that is not included.
- No CD player, so you will rely on Bluetooth, USB, AUX, or radio.
- Some buyers report the unit failing or behaving glitchy after months, so long-term reliability may be a concern.
What buyers think
Buyer-review evidence for the BOSS MGV520B points to a mostly practical, setup-focused pattern. Many comments highlight loud, clear audio that can stand up to engine noise in an off-road environment, along with fast Bluetooth connections and solid AM/FM reception. Buyers also tend to appreciate the receiver’s display readability and straightforward controls. The other recurring theme is installation compatibility, where the camera inputs and pre-amp outputs are used to expand the system.
At the same time, buyer-review evidence is mixed on durability. There are reports of the unit powering on intermittently, getting glitchy, or not turning on after a period of use. Because those concerns appear in the review record, it is wise to weigh reliability risk against the feature set, especially if you want a “set it and forget it” head unit.
Key features that matter for marine and UTV audio
Weatherproof build for real-world splashes
The MGV520B is designed to handle wet conditions with an IPX6 rating for protection against splashing water, plus weatherproofing measures like UV coating on the front panel and conformal coating on the PC board. If your setup sees rain, wash-downs, or heavy splashes, this is one of the more relevant reasons to consider it over a standard car head unit.
Bluetooth plus multiple media sources (no CD drive)
For everyday listening, the receiver supports wireless Bluetooth playback and control. It also includes USB playback, AUX-in via a 3.5mm connection, and AM/FM radio. The unit does not include a CD mechanism, so music libraries and audio habits need to be compatible with modern sources (streaming, files, or radio).
USB and video/camera support for expanded setups
Beyond audio playback, the receiver supports video switching from a rear to front camera input (camera sold separately) and includes the ability to use USB for audio/video files (with a stated maximum supported USB capacity of 32GB). If you are building a more complete system, these inputs can reduce the need for separate components.
Built-in amplification and flexible outputs
The built-in amplifier is rated at 60 watts per channel x 4, and the receiver provides pre-amp outputs for the front and rear channels as well as a dedicated subwoofer pre-amp option. This matters if you want to run a straightforward speaker upgrade first, then add amplification or a sub later.
Pros and cons in plain terms
Pros
- Good audio payoff for the class: multiple buyers describe clear sound and enough volume for noisy off-road conditions.
- Convenient wireless control: Bluetooth connects quickly and supports streaming from apps.
- System expansion is built in: pre-amp outputs and camera/video switching support easier multi-component builds.
- Weather-focused design: IPX6-style protection is well suited to splash-prone use.
Cons
- Accessory start feature needs extra hardware: the accessory button expects a relay that is not included.
- No CD playback: if your routine includes physical media, you will need a different source.
- Reliability concerns show up in the review record: some buyers report failure or glitching after a period of use, so budget and expectations should reflect that risk.
Who should buy the BOSS MGV520B
- You want a marine-style, weatherproof receiver for a boat or splash-prone UTV that you can control from a smartphone.
- You prefer Bluetooth and USB media over CD collections.
- You want built-in amplification plus pre-amp outputs to grow your speaker or subwoofer setup.
- You’re looking for a compact gauge-style head unit experience with a readable 3-inch LCD.
Who should avoid it
- You need an accessory “start” button to work with no extra parts, since a relay is required (not included).
- You require long-term reliability above all else and are uncomfortable with reported post-install issues in the review record.
- You specifically need CD playback, because the unit is a no-CD model.
Installation and compatibility checklist
Before you commit, confirm these points so the receiver works the way you expect in your vehicle or boat:
- Accessory relay requirement: plan for the relay needed by the accessory start function.
- Video/camera expectations: if you want camera switching, make sure you have the compatible camera hardware.
- Inputs and outputs: match your wiring plan to the pre-amp outputs (front/rear and subwoofer) and your desired speaker setup.
- Media sources: confirm your playlists are available via Bluetooth, USB files, AUX, or radio.
Verdict
The BOSS MGV520B is a strong feature match for buyers who want Bluetooth-first media, AM/FM, and a weatherproof gauge receiver with real expansion options (pre-amp outputs and video/camera support). If your main priority is wet-weather usability and straightforward daily listening, it can make sense. Just weigh the reliability concerns that have shown up in the review record and plan your install carefully, especially around the accessory relay requirement.
Ready to compare options or check the most current details? Buy on Amazon.
FAQ
Does the BOSS MGV520B have a CD player?
No. It is a no-CD marine gauge receiver, so you’ll use Bluetooth, USB, AUX, or AM/FM radio.
What weather protection does the MGV520B offer?
It is rated for splashing water with an IPX6 rating, and it uses front panel UV coating and conformal-coated internal electronics.
Can I connect a backup camera to this receiver?
Yes. It supports video switching (rear to front) for a camera, but the camera itself is sold separately.
Does it include a built-in amplifier?
Yes. The receiver has a built-in 4-channel amplifier rated at 60 watts x 4, and it also provides pre-amp outputs for front and rear plus a subwoofer.
Do I need extra parts for the accessory start button?
Yes. The accessory/start button functionality requires a relay, and that relay is not included.
How much media can I use with USB?
The receiver supports USB playback and states a maximum supported USB capacity of 32GB.
Specifications
| Product Title | BOSS Audio Systems MGV520B Marine Gauge Receiver – Weatherproof, 3 Inch LCD, Built-in Amplifier, Bluetooth, Digital Media MP3 Player, No CD Player, USB Port, AM/FM Radio |
|---|---|
| Category | Electronics > Car & Vehicle Electronics > Marine Electronics > Marine Stereos |
| Brand | BOSS Audio Systems |
| Manufacturer | BOSS Audio Systems |
| Model Number | MGV520B |
| Color | Black |
| Item Weight | 0.01 Ounces |
| Connectivity Technology | Auxiliary, Bluetooth, USB |
| Controller Type | iOS |
| Other Special Features of the Product | 3 Inch Touchscreen, AM/FM Radio, Built-In Bluetooth, Built-in Amplifier, No CD Player, USB Port, Weatherproof |
| Compatible Devices | Smartphone, Speaker |
| Connector Type | 3.5mm Jack, USB |
| Audio Output Mode | Stereo |
| Surround Sound Channel Configuration | 4 |
| Video Encoding | H.264, MPEG-4 |
| Output Power | 60 Watts |
| Number of Channels | 4 |
| Output Wattage | 240 |
| Supported Internet Services | Pandora, Spotify |
| Audio Output Type | Speakers |
| Wireless Technology | AM/FM, Bluetooth |
| Format | WAV, WMA |
| UPC | 791489130974 |
| Mfr Part Number | MGV520B |
| External Testing Certification | não disponível |
| Warranty Description | Warranty - BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty so long as the purchase is made through Amazon.com. We strongly encourage professional installation of this product to ensure proper and safe functionality |
| Item Type Name | BOSS Audio Systems MGV520B Marine Gauge Receiver – Weatherproof, 3 Inch LCD, Built-in Amplifier, Bluetooth, Digital Media MP3 Player, No CD Player, USB Port, AM/FM Radio |
Available variants
Style
- MGR250B + 4 Speakers
- MGV500B Receiver
- MGV550B Receiver
- MGR250B Receiver
- MGV520B Receiver
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