Fusion Apollo MS-RA800
The flagship pick for a large boat that wants four zones, Wi-Fi streaming and real power from the head unit itself. Skip it if you listen to SiriusXM.
Amazon $999.99$999.99
40 W x 4 RMS4Panel cutout
A marine stereo is a head unit built to live outdoors: a sealed or coated circuit board, a UV-resistant face and, on the better units, a tested IP water rating for the front panel. These rankings cover the receivers sold for boats and also fitted to golf carts, UTVs and side-by-sides, from $60 Bluetooth units to four-zone networked stereos. Speakers and amplifiers sold on their own are left out.
Mounting is the first choice, because it decides what fits your dash. A gauge-hole stereo drops into a round cutout of about 3 in, the same as an engine gauge. A single-DIN unit fits the standard car-stereo opening. Many marine-only stereos, including most Fusion, Clarion and JL Audio units, use their own rectangular cutout. If you are replacing a stereo, measure the hole before you buy.
Power is the second. The number that matters is RMS watts per channel at 4 ohm. Many listings print a peak or “max” figure two or three times larger, or rate the amplifier at 2 ohm. Those numbers are shown in the notes but never ranked. If you plan to drive wakeboard tower speakers or a large boat, plan on an external amplifier, and look for more pre-amp outputs and a higher pre-out voltage.
Zones let the cockpit, the bow and the swim platform each run at their own volume. A two-zone stereo covers most runabouts. Three or four zones, with line and subwoofer outputs per zone, suit larger boats where every area gets its own amplifier.
Connections finish the picture. NMEA 2000 lets a chartplotter control the stereo, SiriusXM keeps music playing offshore once FM fades, and a NOAA weather band gives forecasts on the water.
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.
Top Picks
BOSS Audio MGR350B
#6 in Gauge-holeFull review
A step up from the MGR300B for a gauge-hole install, with better water resistance, a weather band and a subwoofer output.
Amazon $178.94$178.94
1Gauge hole
Shop by Mount
Gauge-hole
10 rankedRound stereos that fit a gauge cutout of about 3 in, for small consoles, golf carts and UTV dashes.
Top rated: BOSS Audio MGV550B $245
Dash and panel
18 rankedSingle-DIN and rectangular-face stereos, from basic Bluetooth receivers to four-zone networked head units.
Top rated: Fusion Apollo MS-RA800 $999.99
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Best Gauge-Hole Marine Stereos
- BOSS Audio MGV550B#1 of 10Full review
A gauge-mount stereo with a big touchscreen and camera input, for a center console or UTV where you want to see a backup camera. The amplifier rating is not published.
Amazon $245$245-1Gauge hole - Rockford Fosgate PMX-3#2 of 10Full review
The most complete Rockford gauge-hole receiver, for a wake boat or UTV dash with no room for a larger stereo.
Amazon $589.99$589.9925 W x 4 RMS1Gauge hole - Kenwood eXcelon KMR-XM500#3 of 10Full review
The step-up version of Kenwood’s gauge-hole stereo, for a system that will run external amplifiers. If the stereo will power the speakers directly, the KMR-M300BT does the same job for less.
Amazon $349$34919 W x 4 RMS1Gauge hole - Rockford Fosgate PMX-2#4 of 10Full review
A color-screen version of the PMX-1. The PMX-3 costs a little more and adds SiriusXM and a camera input.
Amazon $549.99$549.9925 W x 4 RMS1Gauge hole - Rockford Fosgate PMX-1#5 of 10Full review
A well-built gauge-hole receiver for a small boat or powersports rig. Its rated power is among the best of the gauge units here.
Amazon $329.99$329.9925 W x 4 RMS1Gauge hole
Best Dash and Panel Marine Stereos
- Fusion Apollo MS-RA800#1 of 18Full review
The flagship pick for a large boat that wants four zones, Wi-Fi streaming and real power from the head unit itself. Skip it if you listen to SiriusXM.
Amazon $999.99$999.9940 W x 4 RMS4Panel cutout - Fusion Apollo MS-RA770#2 of 18Full review
A four-zone touchscreen stereo with built-in Wi-Fi, for larger boats with several amplified areas. The RA800 fits the same hole and is the newer choice.
Amazon $744.79$744.7926 W x 4 RMS4Panel cutout - Fusion Apollo MS-RA670#3 of 18Full review
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$549.9926 W x 4 RMS3Panel cutout - Clarion CMM-30#4 of 18Full review
A four-zone stereo with chartplotter control for well under the price of an Apollo. It suits a boat that will add amplifiers zone by zone.
Amazon $427.86$427.8625 W x 4 RMS4Panel cutout - Fusion MS-RA210#5 of 18Full review
The Fusion that covers most boats: color screen, USB, SiriusXM and chartplotter control in the standard Fusion cutout. It fits owners who want those features without paying Apollo prices.
Amazon $399.99$399.9926 W x 4 RMS2Panel cutout
How We Rank
Each stereo is ranked against others with the same type of mount, and scored on its RMS power, zones, pre-amp outputs, features, front water rating, display and warranty.
| Factor | Measures | Weight |
|---|---|---|
| Amplifier power | RMS watts per channel at 4 ohm, never peak or max | 20% |
| Zones | independently controlled audio zones | 15% |
| Pre-amp outputs | RCA output sets for adding amplifiers and subwoofers | 10% |
| Features | NMEA 2000, SiriusXM, phone app, Wi-Fi or AirPlay, weather band, Bluetooth and USB | 25% |
| Water rating | IP rating of the front panel | 10% |
| Display | screen size and color | 10% |
| Warranty | warranty length | 10% |
How we rank explains each factor in full.