Short answer: the Minirig 4. It ranks #7 of 177 medium speakers by sound quality, rated 4.3/5, at $229.95. The Sony ULT Field 1 ranks #99, rated 3.1/5, at $108, $121.95 cheaper, a saving that is not big enough to make up the sound-quality gap.
The Sony ULT Field 1 is the tougher choice. A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. It is rated IP67 against Splash resistant for the Minirig 4. Watch for: Upper midrange peak, rolled off treble.
The Minirig 4 is the better-sounding, longer-running pick. A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery. It is rated for 30 hours of battery against 12 for the Sony ULT Field 1. It keeps a wired aux input, which the Sony ULT Field 1 lacks. The catch: Calls itself splash resistant and has no official water rating.
Buy the Minirig 4. It is rated higher for sound quality, and the $121.95 you would save on the Sony ULT Field 1 does not close the gap.
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 small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery.
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 | Minirig 4 | |
|---|---|---|
| Price | $108.00 | $229.95 |
| Ranked | #99 of 177 in Medium Size Portable Bluetooth Speakers | #7 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes |
| IP Rating | IP67 | Splash resistant |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | No | Yes (USB-C) |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | Pointing up |
| TWS | Yes | Yes (Bluetooth or cable) |
| Weight | 1.4 lbs (650 g) | 1.2 lbs (550 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | AAC, SBC |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 8.1” x 3” x 3” (206 x 77 x 76 mm) | 4” x 2.9” (101.6 x 73 mm) (diameter x height) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 70mm custom driver |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | - |
| Aux Latency | - | 0ms |
| Bass Extension (-10dB) | - | 56Hz |
| Bluetooth Latency | - | 60ms |
| Maximum SPL | - | 106dB (measured by Alan Ross Reviews) |
| Frequency Response | - | 60Hz - 18kHz (Manufacturer specified) |
| Amplifier Power | - | 50W |
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