Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The EarFun Uboom L ranks #2 of 179 medium speakers by sound quality at $49.79; the JBL Go 4 ranks #30 of 62 small speakers by sound quality at $49.95.
The EarFun Uboom L is the deeper-bass, longer-running pick. 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 82Hz for the JBL Go 4. It is rated for 16 hours of battery against 7 for the JBL Go 4. It supports AAC Bluetooth, which the JBL Go 4 lacks. Watch for: It cannot produce real low-bass rumble or fill a large, noisy space, and the top end loses some detail.
The JBL Go 4 is the lighter option. A pocket sized waterproof mini speaker with a loop for hanging and app EQ. At 0.4 lbs (190 g) it weighs much less than the EarFun Uboom L at 1.4 lbs (650 g). It links with other speakers (Auracast), which the EarFun Uboom L cannot. Watch for: Not much bass at all, especially with electronic/bass-heavy tracks pushed past ~50% volume.
Buy the EarFun Uboom L at $49.79 if you want a medium speaker. Buy the JBL Go 4 at $49.95 if you want a small speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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 | JBL Go 4 | |
|---|---|---|
| Price | $49.79 after coupon UBOOMLWC | $49.95 |
| Ranked | #2 of 179 in Medium Size Portable Bluetooth Speakers | #30 of 62 in Small Size Portable Bluetooth Speakers |
| App | Yes (firmware >= 1.2.6) | Yes |
| Aux Input | Yes | No |
| Aux Latency | 216ms | - |
| Bass Extension (-10dB) | 56Hz | ~82Hz |
| Battery Life | 16 hours (Manufacturer specified) | 7 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (10 band, firmware >= 1.2.6) | Yes |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 400ms normal / 66ms low latency mode | - |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) | - |
| Party Mode | No | Yes (Auracast) |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | Pointing up |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 0.4 lbs (190 g) |
| Bluetooth Version | 5.0 | 5.3 |
| Dimensions | 3.1” x 8.3” x 2.8” (78 x 210 x 72 mm) | 3.7” x 3” x 1.7” (94.3 x 75.7 x 42.2 mm) |
| Drivers | 2x 55mm drivers + 2x passive radiators | 45mm |
| Amplifier Power | 28W | 4.2W |
| Digital Aux Input | No | No |
| Frequency Response | - | 90Hz - 20kHz (Manufacturer specified) |
| Charging Time | - | 3 hours |
| Strap | - | Yes (built-in loop) |
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