A compact, simple Bluetooth receiver for a small boat with a second zone or a subwoofer.
Amazon $224.99
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.
- 25 W x 4 RMSPower
- 2Zones
- IP66Water rating
- 2.4 in monochromeDisplay
Price checked November 7, 2026. As an Amazon Associate we earn from qualifying purchases.
- 25 W RMS per channel at a 1% distortion rating, strong for the price
- Two zones and a NOAA weather band
- IP66 front
- Monochrome screen
- No SiriusXM, app or chartplotter connection
- 1-year warranty
The Clarion CMM family
Every Clarion CMM model we rank, smallest first. Ratings compare each against its own mount.
| Model | Power | Rating | Price |
|---|---|---|---|
| Clarion CMM-20 (this one) | 25 W x 4 RMS | 2.6/5 | $206.77 |
| Clarion CMM-30 | 25 W x 4 RMS | 3.6/5 | $427.86 |
How it scores
The rating comes from 7 measured or published factors, each scored 0-100 against fixed reference points for its mount. How we rank explains each one.
Specifications
| Model number | CMM-20 (010-03223-00) |
|---|---|
| Audio | |
| Amplifier power (RMS, 4 ohm) | 25 W x 4 RMS |
| Zones | 2 |
| RCA output sets | 2 |
| Sources and control | |
| Bluetooth | Yes |
| USB playback | Yes |
| Phone app | No |
| SiriusXM-ready | No |
| NMEA 2000 | No |
| Wi-Fi or AirPlay 2 | No |
| Weather band | Yes |
| DAB+ | No |
| CD player | No |
| Camera input | No |
| Build | |
| Mount | Panel cutout |
| Front water rating | IP66 |
| Display | 2.4 in monochrome |
| Warranty | 1 year |
Alternatives in this mount
The cheapest way to put Bluetooth on a small boat with a single-DIN hole. The listing leaves out most of the numbers that matter.
Amazon $59.99An inexpensive single-DIN marine receiver with Bluetooth, USB and SiriusXM. Sony publishes too little about its amplifier and water rating to rank it higher.
Amazon $128Compare
Compare the Clarion CMM-20 with any other marine stereo →
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