Short answer: the B&O Beosound A1 3rd gen on measured sound quality, the Sony ULT Field 1 on price. The B&O Beosound A1 3rd gen ranks #19 of 177 medium speakers, rated 4.1/5, at $399. The Sony ULT Field 1 ranks #99, rated 3.1/5, at $108, $291 cheaper.
Why pick the Sony ULT Field 1: A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. The tradeoff: Upper midrange peak, rolled off treble.
The B&O Beosound A1 3rd gen is the better-sounding, longer-running option. A premium waterproof puck speaker with good sound, a long battery, and a battery you can swap, built to last. It is rated for 24 hours of battery against 12 for the Sony ULT Field 1. It supports aptX Adaptive Bluetooth, which the Sony ULT Field 1 lacks. The tradeoff: Distorts easier than the 2nd gen with deeper bass.
Buy the Sony ULT Field 1 when the price outweighs sound quality for you, and the B&O Beosound A1 3rd gen when sound quality outweighs the price instead.
Want more options? Browse the full Portable Bluetooth rankings.
A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing.
A premium waterproof puck speaker with good sound, a long battery, and a battery you can swap, built to last.
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.
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Specifications Side By Side
| Sony ULT Field 1 | B&O Beosound A1 3rd gen | |
|---|---|---|
| Price | $108.00 | $399.00 |
| Ranked | #99 of 177 in Medium Size Portable Bluetooth Speakers | #19 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | Pointing up |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 1.2 lbs (558 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC, AAC, aptX Adaptive |
| Bluetooth Version | 5.3 | 5.1 |
| Dimensions | 8.1” x 3” x 3” (206 x 77 x 76 mm) | 5.2” x 1.8” x 5.2” (133 x 46 x 133 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 82.5mm woofer, 15mm tweeter |
| Digital Aux Input | No | Yes (USB-C) |
| Strap | Yes (detachable strap) | Yes (built-in strap) |
| Amplifier Power | - | 60W |
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