Short answer: the Miatone Boompro. It ranks #16 of 179 medium speakers by sound quality, rated 4.2/5, at $35.99; the Sony ULT Field 3 ranks #71, rated 3.4/5, and costs $208, so there is little reason to consider the other one.
The Miatone Boompro is the better-sounding, lighter pick. A cheap waterproof speaker with very well balanced sound, even at full volume, and a 16 hour battery. At 1.1 lbs (500 g) it weighs much less than the Sony ULT Field 3 at 2.6 lbs (1.2 kg). The tradeoff: Slightly less bass extension than higher ranked speakers.
The Sony ULT Field 3 is the longer-running choice. 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 Miatone Boompro. It has an adjustable EQ, which the Miatone Boompro lacks. It plays in stereo from a single unit, unlike the Miatone Boompro. The catch: Sounds a bit hollow, a bit boosted in the treble.
Buy the Miatone Boompro. It is rated higher for sound quality than the Sony ULT Field 3 and costs less, which makes it the one to get unless you need something the other one does better.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| Miatone Boompro | Sony ULT Field 3 | |
|---|---|---|
| Price | $35.99 | $208.00 |
| Ranked | #16 of 179 in Medium Size Portable Bluetooth Speakers | #71 of 179 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes |
| Aux Input | No | No |
| Battery Life | 16 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| EQ | No | Yes (App + ULT button) |
| IP Rating | IPX7 | IP67 |
| Power Bank | No | Yes (USB-C, 5V/1.5A) |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.1 lbs (500 g) | 2.6 lbs (1.2 kg) |
| Drivers | Dual drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| Digital Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC, AAC, LDAC |
| Lights | Yes | - |
| Dimensions | 7.3”H x 2.8”W x 2.8”D (185 x 71 x 71 mm) | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) |
| Amplifier Power | 36W | 27W |
| Bluetooth Version | 5.3 | 5.2 |
| Built-in Microphone | - | Yes |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Strap | - | Yes (detachable shoulder strap) |
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