BOSS Audio MGR300B
#9 in Gauge-holeFull review
A cheap gauge-hole Bluetooth stereo for a jon boat, golf cart or UTV. Its IPX5 rating covers splashes, not heavy spray.
Amazon $129.99$129.99
The BOSS Audio MGR300B is the better marine stereo overall, rated 2.4 to 2.2. The BOSS Audio MGR300B costs $27.39 less ($129.99 vs $157.38).
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.
JBL PRV-175
#10 in Gauge-holeFull review
A basic gauge-hole stereo for a small boat or cart that needs Bluetooth and radio and little else.
Amazon $157.38$157.38
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gauge-hole marine stereo; a clear win is highlighted. How we rank explains each one.
| Factor weight | BOSS Audio MGR300B | JBL PRV-175 |
|---|---|---|
| Overall rating | 2.4/5 | 2.2/5 |
| Amplifier power 20% | 50 RMS power at 4 ohm not published (neutral score used) | 23 20 W RMS x 4 at 4 ohm |
| Zones 15% | 0 single zone | 0 single zone |
| Pre-amp outputs 10% | 14 2 RCA output sets | 14 2 RCA output sets at 2 V |
| Features 25% | 20 Bluetooth, USB playback | 20 Bluetooth, USB playback |
| Water rating 10% | 40 IPX5 front | 40 IPX5 front |
| Display 10% | 50 display not published (neutral score used) | 50 display not published (neutral score used) |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| BOSS Audio MGR300B | JBL PRV-175 | |
|---|---|---|
| Audio | ||
| Amplifier power (RMS, 4 ohm) | - | 20 W x 4 RMS |
| Zones | 1 | 1 |
| RCA output sets | 2 | 2 at 2 V |
| Sources and control | ||
| Bluetooth | Yes | Yes |
| USB playback | Yes | Yes |
| Phone app | No | No |
| SiriusXM-ready | No | No |
| NMEA 2000 | No | No |
| Wi-Fi or AirPlay 2 | No | No |
| Weather band | No | No |
| DAB+ | No | No |
| CD player | No | No |
| Camera input | No | No |
| Build | ||
| Mount | Gauge hole | Gauge hole |
| Front water rating | IPX5 | IPX5 |