Short answer: the EarFun Uboom L. It ranks #2 of 177 medium speakers by sound quality, rated 4.6/5, at $49.79; the Sony ULT Field 3 ranks #71, rated 3.4/5, and costs $208, so there is not much of a tradeoff to weigh.
The Sony ULT Field 3 is the longer-running pick. A rugged waterproof stereo speaker with long battery life, a detailed app EQ, a shoulder strap and a phone charging port. It is rated for 24 hours of battery against 16 for the EarFun Uboom L. It supports LDAC Bluetooth, which the EarFun Uboom L lacks. It links with other speakers (Party Connect up to 100 speakers), which the EarFun Uboom L cannot. Watch for: Sounds a bit hollow, a bit boosted in the treble.
The EarFun Uboom L is the better-sounding, lighter choice. 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 Sony ULT Field 3 at 2.6 lbs (1.2 kg). It keeps a wired aux input, which the Sony ULT Field 3 lacks. The catch: 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 Sony ULT Field 3 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A rugged waterproof stereo speaker with long battery life, a detailed app EQ, a shoulder strap and a phone charging port.
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
| Sony ULT Field 3 | EarFun Uboom L | |
|---|---|---|
| Price | $208.00 | $49.79 after coupon UBOOMLWC |
| Ranked | #71 of 177 in Medium Size Portable Bluetooth Speakers | #2 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (firmware >= 1.2.6) |
| Aux Input | No | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | AAC, SBC |
| Bluetooth Version | 5.2 | 5.0 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) | 3.1” x 8.3” x 2.8” (78 x 210 x 72 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer | 2x 55mm drivers + 2x passive radiators |
| EQ | Yes (App + ULT button) | Yes (10 band, firmware >= 1.2.6) |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-C, 5V/1.5A) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 2.6 lbs (1.2 kg) | 1.4 lbs (650 g) |
| Amplifier Power | 27W | 28W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | - |
| 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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