Short answer: the Motion 300, and it costs less too. It ranks #99 of 179 medium speakers against the ULT Field 1’s #3, and it is $58.01 cheaper.
The Motion 300 has real bass depth for its size, but its stock tuning has a catch. Our notes call it pretty deep bass for a small speaker, with the flexibility to run in stereo facing you or lying flat for omnidirectional sound, each with its own custom EQ. The catch our notes flag: without applying an EQ, or manually pushing the top two treble bars to max, the stock tuning is quite rolled off in the treble and drops to around the middle of the pack. With the EQ applied, it is one of the better sounding speakers in its class.
The ULT Field 1’s main strength is durability and battery, not sound. Our notes credit it with an IP67 rating that survives drops and 1-meter submersion, plus a real-world battery life north of 28 hours with its bass-boost ULT mode switched off. On sound, its only real weakness is an upper-midrange peak with rolled-off treble, a milder issue than what the Motion 300 needs an EQ to fix.
Everything else is close: both have a companion app, a built-in microphone, USB-C charging, and support for their respective 100-speaker party modes.
Buy the Motion 300 if you’re willing to apply the EQ our notes recommend. Once tuned, it beats the ULT Field 1 on sound and costs less.
Buy the ULT Field 1 if you want strong stereo pairing and long battery life. It is more consistent out of the box even though its ceiling is lower.
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
| Sony ULT Field 1 | Soundcore Motion 300 | |
|---|---|---|
| Price | $138.00 | $79.99 |
| Ranked | #99 of 179 in Medium Size Portable Bluetooth Speakers | #3 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 13 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes (9 band with adjustable frequency) |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | Yes (PartyCast up to 100 speakers) |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | Pointing up |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 1.7 lbs (772 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | AAC, LDAC, SBC |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 8.1” x 3” x 3” (206 x 77 x 76 mm) | 7.9” x 3.6” x 2” (200 x 92 x 50 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 2x 50.8mm (2”) full-range drivers + 2x passive radiators |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | - |
| Bass Extension (-10dB) | - | 50Hz |
| Bluetooth Latency | - | 216ms ldac, 200ms aac, 116ms sbc |
| Maximum SPL | - | 101dB (measured by Alan Ross Reviews) |
| Frequency Response | - | 65Hz - 40kHz (Manufacturer specified) |
| Amplifier Power | - | 30W |
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