Short answer: the EarFun Uboom L. It ranks #2 of 179 medium speakers by sound quality (rated 4.6/5) at $49.79 and is still sold new; the EarFun Uboom Slim ranks #43 (rated 3.7/5) and is discontinued, so it is only an option used.
The EarFun Uboom L is the better-sounding, deeper-bass option. A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video. Its bass reaches about 56Hz before falling 10dB, against 63Hz for the EarFun Uboom Slim. It supports AAC Bluetooth, which the EarFun Uboom Slim lacks. It has an adjustable EQ, which the EarFun Uboom Slim lacks. Watch for: It cannot produce real low-bass rumble or fill a large, noisy space, and the top end loses some detail.
The case for the EarFun Uboom Slim: A slim, affordable waterproof stereo speaker with long battery life that doubles as a speakerphone. The catch: Not as deep bass as others.
Buy the EarFun Uboom L. It is rated higher for sound quality, and the EarFun Uboom Slim is discontinued, so it is only available used.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| EarFun Uboom L | EarFun Uboom Slim | |
|---|---|---|
| Price | $49.79 after coupon UBOOMLWC | $79 Discontinued |
| Ranked | #2 of 179 in Medium Size Portable Bluetooth Speakers | #43 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes (firmware >= 1.2.6) | No |
| Aux Input | Yes | Yes |
| Aux Latency | 216ms | - |
| Bass Extension (-10dB) | 56Hz | ~63Hz |
| Battery Life | 16 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (10 band, firmware >= 1.2.6) | No |
| IP Rating | IP67 | IPX7 |
| Bluetooth Latency | 400ms normal / 66ms low latency mode | - |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) | - |
| Party Mode | No | - |
| Power Bank | No | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 1.2 lbs (560 g) |
| Bluetooth Version | 5.0 | 5.2 |
| Dimensions | 3.1” x 8.3” x 2.8” (78 x 210 x 72 mm) | 2.6”H x 7.1”W x 2.6”D (65 x 180 x 65 mm) |
| Drivers | 2x 55mm drivers + 2x passive radiators | 45mm speaker drivers |
| Amplifier Power | 28W | 20W |
| Digital Aux Input | No | No |
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