These are not really the same size class, and that is the honest framing here. The Marshall Willen II ranks #11 of 62 small speakers by sound quality at $129.99; the Sony ULT Field 1 ranks #99 of 179 medium speakers by sound quality at $138.
The Marshall Willen II is the longer-running, lighter choice. A tiny waterproof strap on speaker with balanced sound, a long battery, and app EQ that clips easily onto a bag. It is rated for 17 hours of battery against 12 for the Sony ULT Field 1. At 0.8 lbs (360 g) it weighs much less than the Sony ULT Field 1 at 1.4 lbs (650 g). The tradeoff: Not that deep of bass.
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. It supports AAC Bluetooth, which the Marshall Willen II lacks. It links with other speakers (Party Connect up to 100 speakers), which the Marshall Willen II cannot. Watch for: Upper midrange peak, rolled off treble.
Buy the Marshall Willen II ($129.99) for a small speaker; the Sony ULT Field 1 ($138) suits a medium speaker instead.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 11, 2026 at 3:26 AM 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
| Marshall Willen II | Sony ULT Field 1 | |
|---|---|---|
| Price | $129.99 | $138.00 |
| Ranked | #11 of 62 in Small Size Portable Bluetooth Speakers | #99 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | 70Hz | - |
| Battery Life | 17 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes |
| IP Rating | IP67 | IP67 |
| Party Mode | No | Yes (Party Connect up to 100 speakers) |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | No |
| TWS | No | Yes |
| Weight | 0.8 lbs (360 g) | 1.4 lbs (650 g) |
| Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | AAC, SBC |
| Bluetooth Version | 5.3 | 5.3 |
| Frequency Response | 75Hz - 20kHz (Manufacturer specified) | - |
| Charging Time | 2.5 hours | - |
| Drivers | 2” (51mm) full-range with dual passive radiators | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| Dimensions | 3.9” x 1.7” x 3.9” (99 x 43 x 99 mm) | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Amplifier Power | 10W | - |
| Digital Aux Input | No | No |
| Strap | Yes (built-in strap) | Yes (detachable strap) |
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