Short answer: the EarFun Uboom L. It ranks #2 of 177 medium speakers by sound quality, rated 4.6/5, at $49.79; the Ultimate Ears Megaboom 4 ranks #171, rated 2.1/5, and costs $200, so there is little reason to consider the other one.
The EarFun Uboom L is the better-sounding, lighter option. A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video. At 1.4 lbs (650 g) it weighs much less than the Ultimate Ears Megaboom 4 at 2.4 lbs (1.1 kg). It supports AAC Bluetooth, which the Ultimate Ears Megaboom 4 lacks. It keeps a wired aux input, which the Ultimate Ears Megaboom 4 lacks. The catch: It cannot produce real low-bass rumble or fill a large, noisy space, and the top end loses some detail.
What the Ultimate Ears Megaboom 4 does well: A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking. It links with other speakers (PartyUp up to 50 speakers), which the EarFun Uboom L cannot. The tradeoff: A lot of distortion at higher volumes.
Buy the EarFun Uboom L. It is rated higher for sound quality than the Ultimate Ears Megaboom 4 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video.
A tough waterproof speaker that floats, with USB-C charging, a long battery and PartyUp linking.
Prices on this page were last checked October 31, 2026 at 7:11 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| EarFun Uboom L | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $49.79 after coupon UBOOMLWC | $200 |
| Ranked | #2 of 177 in Medium Size Portable Bluetooth Speakers | #171 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes (firmware >= 1.2.6) | Yes |
| Aux Input | Yes | No |
| Aux Latency | 216ms | - |
| Bass Extension (-10dB) | 56Hz | - |
| Battery Life | 16 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC |
| Built-in Microphone | Yes | No |
| EQ | Yes (10 band, firmware >= 1.2.6) | Yes (via app) |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 400ms normal / 66ms low latency mode | - |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) | 91dB (Manufacturer specified) |
| Party Mode | No | Yes (PartyUp up to 50 speakers) |
| Power Bank | No | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 2.4 lbs (1.1 kg) |
| Bluetooth Version | 5.0 | 5.1 |
| Dimensions | 3.1” x 8.3” x 2.8” (78 x 210 x 72 mm) | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Drivers | 2x 55mm drivers + 2x passive radiators | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| Amplifier Power | 28W | - |
| Digital Aux Input | No | No |
| Strap | - | Yes (built-in loop) |
Related Speaker Comparisons
More worthwhile head-to-heads for EarFun Uboom L: