Short answer: the EarFun Uboom L. It ranks #2 of 176 medium speakers by sound quality, rated 4.6/5, at $49.79; the CMF Speaker M ranks #87, rated 3.3/5, and costs $89, so there is little reason to consider the other one.
The case for the CMF Speaker M: A two way design with a 70mm woofer and 16mm tweeter on 35W, giving crisp treble, detailed vocals, and a fairly neutral tuning on most music. It links with other speakers (Auracast), which the EarFun Uboom L cannot. The catch: Struggles with dense rock and metal at volume, where the low end gets muddy and vocals turn shrill even with Ultra Bass on.
The EarFun Uboom L is the better-sounding option. A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video. It keeps a wired aux input, which the CMF Speaker M lacks. It plays in stereo from a single unit, unlike the CMF Speaker M. Watch for: It cannot produce real low-bass rumble or fill a large, noisy space, and the top end loses some detail.
Buy the EarFun Uboom L. It is rated higher for sound quality than the CMF Speaker M and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A two way design with a 70mm woofer and 16mm tweeter on 35W, giving crisp treble, detailed vocals, and a fairly neutral tuning on most music.
A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video.
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Specifications Side By Side
| CMF Speaker M | EarFun Uboom L | |
|---|---|---|
| Price | $89.00 | $49.79 after coupon UBOOMLWC |
| Ranked | #87 of 176 in Medium Size Portable Bluetooth Speakers | #2 of 176 in Medium Size Portable Bluetooth Speakers |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 6.0 | 5.0 |
| Bluetooth Codecs | SBC, AAC, LC3 (Auracast only) | AAC, SBC |
| IP Rating | IP68 | IP67 |
| Built-in Microphone | No | Yes |
| TWS | Yes (Stereo Mode) | Yes |
| App | Yes (Nothing X) | Yes (firmware >= 1.2.6) |
| EQ | Yes (4 presets + custom) | Yes (10 band, firmware >= 1.2.6) |
| Power Input | USB-C | USB-C |
| Aux Input | No | Yes |
| Digital Aux Input | Yes (USB-C audio) | No |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| Power Bank | No | No |
| Party Mode | Yes (Auracast) | No |
| Lights | No | - |
| MicroSD Playback | No | - |
| Amplifier Power | 35W RMS (25W woofer + 10W tweeter) | 28W |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Drivers | 1x 70mm woofer + 1x 16mm tweeter | 2x 55mm drivers + 2x passive radiators |
| Battery Life | 18 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| Charging Time | 3 hours | - |
| Weight | 1.3 lbs (602 g) | 1.4 lbs (650 g) |
| Dimensions | 8.7” x 3.3” x 2.1” (220 x 85 x 54 mm) | 3.1” x 8.3” x 2.8” (78 x 210 x 72 mm) |
| Strap | No (built-in handle) | - |
| Aux Latency | - | 216ms |
| Bass Extension (-10dB) | - | 56Hz |
| Bluetooth Latency | - | 400ms normal / 66ms low latency mode |
| Maximum SPL | - | 103dB (measured by Alan Ross Reviews) |
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