Most marine stereos have a display, a faceplate, something mounted where you can see and touch it. Fusion sells two that skip that entirely. The MS-WB675 ($549.99) and MS-BB100 ($349.99) have no screen and no dash-facing controls, they're built to disappear into a console or storage locker, with all the actual control happening on a phone, a wired remote, or a chartplotter.
Side-by-Side
| Spec | MS-WB675 | MS-BB100 |
|---|---|---|
| Price | $549.99 | $349.99 |
| Zones | Up to 4 (8 with a second unit) | 2 |
| Built-In Amp | Class-D, 280W peak | Class AB, 200W peak |
| Wi-Fi / AirPlay 2 | Yes | No |
| NMEA 2000 | Yes | Yes |
| Included Remote | None (MFD, app, or optional ERX400) | Bluetooth-embedded wired remote included |
| SiriusXM Ready | Yes | No |
Key Takeaways
- Both units are designed to hide in a dash, console, or storage locker, with zero visible faceplate on either one.
- MS-WB675 is the multi-zone flagship: up to 4 zones from one unit (8 by networking two together), Wi-Fi streaming with AirPlay 2, and NMEA 2000 for chartplotter control.
- MS-BB100 is the simpler, cheaper option: 2 zones, no Wi-Fi, but it's the only one of the two that ships with its own dedicated Bluetooth-embedded wired remote in the box.
- MS-WB675 has no included remote at all, control comes from a compatible MFD, a smart device over the network, or Fusion's separately-sold ERX400 wired remote.
- Both are NMEA 2000 ready, meaning either can be controlled from a compatible chartplotter without an additional remote, if you already have one on board.
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Why Hide a Stereo At All
A traditional gauge-style or flush-mount stereo needs a cutout, a visible faceplate, and takes up dash space that could go to gauges or switches. Both the WB675 and BB100 solve that by removing the display entirely and relying on Bluetooth, an app, a chartplotter, or a wired remote for control, letting the actual electronics live somewhere out of sight, a storage locker, under a helm console, wherever fits.
The Real Gap: Control Method
This is where the two units genuinely diverge. The BB100 includes its own purpose-built wired remote with Bluetooth built directly into the remote itself, reducing interference between your phone and the receiver, and it's IPX7-rated for direct exposure at the helm. The WB675 includes no remote in the box at all, it's designed to be controlled from a compatible Garmin or other MFD, a smart device over Wi-Fi, or Fusion's ERX400 remote, sold separately. If you don't already have a compatible chartplotter and don't want to buy a separate remote, that's a real added cost on top of the WB675's higher price.
Zones and Power
MS-BB100 covers 2 independent zones at 200W peak (Class AB). MS-WB675 covers up to 4 zones at 280W peak (Class-D, 2-ohm stereo-stable), and can extend to 8 zones by networking a second WB675 over Ethernet. For a boat with more than 2 distinct listening areas, the WB675 is the only one of the two that actually covers it without adding a second unit.
Honest Cons
The MS-WB675's control setup adds real cost or complexity if you don't already have a compatible MFD, factor in the ERX400 remote's price if you need one, it's not included.
Neither unit has a display, if you want to glance at track info without picking up a phone or looking at a chartplotter, a traditional gauge-style stereo is the better fit.
The BB100's 2-zone limit is a real ceiling, a boat needing 3 or more zones needs the WB675 or a second BB100 unit.
Frequently Asked Questions
Do I need a chartplotter to use either of these?
No, both work over Bluetooth without one, an MFD or chartplotter is an optional additional control method, not a requirement.
Which one includes a remote?
Only the MS-BB100, its Bluetooth-embedded wired remote is included. The MS-WB675 requires an MFD, a smart device, or a separately-sold ERX400 remote.
Can I run more than 4 zones?
Yes, with the MS-WB675, networking a second WB675 unit extends control to 8 total zones.
Is SiriusXM available on both?
Only the MS-WB675 is SiriusXM-ready; the MS-BB100 is not.
Bottom Line
MS-BB100 for a simple, self-contained 2-zone setup with its own remote included. MS-WB675 for a larger multi-zone build with Wi-Fi streaming and chartplotter integration, provided you're ready to account for a remote or MFD separately.