Fusion Apollo MS-RA670
An Apollo-series stereo in the compact Fusion cutout, for a boat with up to three amplified zones. Buy it over the RA210 for the third zone, the networking and the longer warranty.
Amazon $549.99$549.99
The Fusion Apollo MS-RA670 is the better marine stereo overall, rated 4.1 to 2.6. The Fusion Apollo MS-RA670 leads on features, warranty and pre-amp outputs. The Clarion CMM-20 costs $343.22 less ($206.77 vs $549.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Clarion CMM-20
#13 in Dash and panelFull review
A solid two-zone stereo around $200 for a boat that powers its speakers from the head unit. Step up to the CMM-30 for color, SiriusXM and NMEA 2000.
Amazon $206.77$206.77
Which should you buy?
- Choose the Fusion Apollo MS-RA670 for features (NMEA 2000, SiriusXM-ready, phone app, Wi-Fi or AirPlay 2, Bluetooth, USB playback vs weather band, Bluetooth, USB playback), warranty (3-year warranty vs 1-year warranty) and pre-amp outputs (6 RCA output sets vs 2 RCA output sets).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every dash and panel marine stereo; a clear win is highlighted. How we rank explains each one.
| Factor weight | Fusion Apollo MS-RA670 | Clarion CMM-20 |
|---|---|---|
| Overall rating | 4.1/5 | 2.6/5 |
| Amplifier power 20% | 46 26 W RMS x 4 at 4 ohm | 42 25 W RMS x 4 at 4 ohm |
| Zones 15% | 67 3 zones | 33 2 zones |
| Pre-amp outputs 10% | 71 6 RCA output sets | 14 2 RCA output sets |
| Features 25% | 85 NMEA 2000, SiriusXM-ready, phone app, Wi-Fi or AirPlay 2, Bluetooth, USB playback | 35 weather band, Bluetooth, USB playback |
| Water rating 10% | 100 IPX6/IPX7 front | 70 IP66 front |
| Display 10% | 58 2.7 in color | 10 2.4 in monochrome |
| Warranty 10% | 100 3-year warranty | 0 1-year warranty |
Specifications
| Fusion Apollo MS-RA670 | Clarion CMM-20 | |
|---|---|---|
| Audio | ||
| Amplifier power (RMS, 4 ohm) | 26 W x 4 RMS | 25 W x 4 RMS |
| Zones | 3 | 2 |
| RCA output sets | 6 | 2 |
| Sources and control | ||
| Bluetooth | Yes | Yes |
| USB playback | Yes | Yes |
| Phone app | Yes | No |
| SiriusXM-ready | Yes | No |
| NMEA 2000 | Yes | No |
| Wi-Fi or AirPlay 2 | Yes | No |
| Weather band | No | Yes |
| DAB+ | Yes | No |
| CD player | No | No |
| Camera input | No | No |
| Build | ||
| Mount | Panel cutout | Panel cutout |
| Front water rating | IPX6/IPX7 | IP66 |
| Display | 2.7 in color | 2.4 in monochrome |
| Warranty | 3 years | 1 year |