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 Boom 4 ranks #112, rated 2.9/5, and costs $114.99, which makes this an easy call rather than a real tradeoff.
What the Ultimate Ears Boom 4 does well: A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. Watch for: Not much improvement over the old ones.
The EarFun Uboom L is the better-sounding choice. A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video. It supports AAC Bluetooth, which the Ultimate Ears Boom 4 lacks. It keeps a wired aux input, which the Ultimate Ears Boom 4 lacks. 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 Ultimate Ears Boom 4 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Portable Bluetooth rankings.
A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers.
A great value medium speaker with clear, natural sound, waterproofing, and a Video Mode that keeps audio in sync with video.
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
| Ultimate Ears Boom 4 | EarFun Uboom L | |
|---|---|---|
| Price | $114.99 | $49.79 after coupon UBOOMLWC |
| Ranked | #112 of 177 in Medium Size Portable Bluetooth Speakers | #2 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (firmware >= 1.2.6) |
| Battery Life | 15 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| IP Rating | IP67 | IP67 |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 1.4 lbs (620 g) | 1.4 lbs (650 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 5.0 |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) | 3.1” x 8.3” x 2.8” (78 x 210 x 72 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators | 2x 55mm drivers + 2x passive radiators |
| TWS | Yes | Yes |
| EQ | Yes (via app) | Yes (10 band, firmware >= 1.2.6) |
| Built-in Microphone | No | Yes |
| Power Bank | No | No |
| Aux Input | No | Yes |
| Maximum SPL | 85dBC (Manufacturer specified) | 103dB (measured by Alan Ross Reviews) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | AAC, SBC |
| Strap | Yes (built-in loop) | - |
| Aux Latency | - | 216ms |
| Bass Extension (-10dB) | - | 56Hz |
| Bluetooth Latency | - | 400ms normal / 66ms low latency mode |
| Party Mode | - | No |
| Amplifier Power | - | 28W |
Related Speaker Comparisons
More top alternatives to EarFun Uboom L: