Short answer: the B&O Beosound A1 2nd gen. It ranks #11 of 177 medium speakers by sound quality, rated 4.3/5, at $395. The Sony ULT Field 1 ranks #99, rated 3.1/5, at $108, $287 cheaper, a saving that is not big enough to make up the sound-quality gap.
The case for the Sony ULT Field 1: A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. The catch: Upper midrange peak, rolled off treble.
The B&O Beosound A1 2nd gen is the better-sounding, longer-running option. A premium waterproof puck speaker with balanced sound, a built in strap, and a long battery for travel. It is rated for 18 hours of battery against 12 for the Sony ULT Field 1. It supports aptX Adaptive Bluetooth, which the Sony ULT Field 1 lacks.
Buy the B&O Beosound A1 2nd gen. It is rated higher for sound quality, and the $287 you would save on the Sony ULT Field 1 does not close the gap.
Looking for alternatives? See the complete 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 balanced sound, a built in strap, and a long battery for travel.
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 2nd gen | |
|---|---|---|
| Price | $108.00 | $395.00 |
| Ranked | #99 of 177 in Medium Size Portable Bluetooth Speakers | #11 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 18 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”W x 5.2”D x 1.8”H (133 x 133 x 46 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 3.5mm aluminium driver + 0.75 inch silk dome tweeter |
| Digital Aux Input | No | Yes (USB-C) |
| Strap | Yes (detachable strap) | Yes (built-in strap) |
| Bass Extension (-10dB) | - | 58Hz |
| Bluetooth Latency | - | 90ms |
| Maximum SPL | - | 93dB (measured by Alan Ross Reviews) |
| Amplifier Power | - | 60W total (2x 30W Class D) |
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