Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Soundcore Boom Go 3i ranks #2 of 62 small speakers by sound quality at $59.98; the Sony ULT Field 1 ranks #99 of 179 medium speakers by sound quality at $138.
The Soundcore Boom Go 3i is the longer-running, lighter pick. A tough, floating mini speaker with full waterproofing, a long battery and a detachable strap, built for travel and the outdoors. It is rated for 24 hours of battery against 12 for the Sony ULT Field 1. At 0.8 lbs (380 g) it weighs much less than the Sony ULT Field 1 at 1.4 lbs (650 g). The catch: This is still a 15W mono speaker: bass impact and stereo width are limited, and critical listeners may find the upper treble piercing or metallic.
What the Sony ULT Field 1 does well: A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. It supports AAC Bluetooth, which the Soundcore Boom Go 3i lacks. Watch for: Upper midrange peak, rolled off treble.
Buy the Soundcore Boom Go 3i at $59.98 for a small speaker, or the Sony ULT Field 1 at $138 for a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Prices on this page were last checked November 7, 2026 at 7:34 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
| Soundcore Boom Go 3i | Sony ULT Field 1 | |
|---|---|---|
| Price | $59.98 | $138.00 |
| Ranked | #2 of 62 in Small Size Portable Bluetooth Speakers | #99 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | AAC, SBC |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes |
| IP Rating | IP68 | IP67 |
| Party Mode | Yes (Auracast) | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Weight | 0.8 lbs (380 g) | 1.4 lbs (650 g) |
| Bluetooth Version | 6.0 | 5.3 |
| Amplifier Power | 15W | - |
| Dimensions | 4” x 4.2” x 1.8” (102.1 x 105.9 x 45.5 mm) | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Drivers | 25mm tweeter + 42mm woofer + passive radiators | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| Maximum SPL | 92dB (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | Yes (detachable strap) | Yes (detachable strap) |
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