Short answer: the Minirig 2 for flexibility, the Sony ULT Field 3 for a cheap IP67 shell. The Minirig 2 is modular and can easily attach a subwoofer, though it is not stereo. The Sony is IP67 rated and water resistant but sounds a bit hollow with boosted treble, and it ranks #60 of 142 against #8 of 142 for the Minirig.
The case for the Minirig 2: Modular, can easily attach a subwoofer. Set against that: Not stereo.
What the Sony ULT Field 3 gets right: IP67 rated, dustproof and water resistant. The catch: Sounds a bit hollow, a bit boosted in the treble.
One note: the Minirig 2 is no longer sold new, but at #8 of 142 medium speakers by sound quality it still outranks most current models, so used is worth considering.
Buy the Minirig 2 if sound quality matters more than the price. Buy the Sony ULT Field 3 if the price matters more than sound quality.
Battery life favors the Minirig 2: rated for 40 hours against 24 hours for the Sony ULT Field 3.
If water resistance matters to you, the Sony ULT Field 3 at IP67 (brief submersion) holds up far better than the Minirig 2 at Splash resistant (splashing).
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Minirig 2 | Sony ULT Field 3 | |
|---|---|---|
| Price | $140 Discontinued | $138.00 |
| Ranked | #8 of 142 in Medium Size Portable Bluetooth Speakers | #60 of 142 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | No |
| Aux Latency | 0ms | - |
| Bass Extension (-10dB) | 54Hz | - |
| Battery Life | 40 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | No | Yes |
| EQ | Yes | Yes (App + ULT button) |
| IP Rating | Splash resistant | IP67 |
| Maximum SPL | 95dB (measured by Alan Ross Reviews) | - |
| Power Bank | No | Yes (USB-C, 5V/1.5A) |
| Power Input | Proprietary USB cable | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes (cable) | Yes |
| Weight | 1.1 lbs (488 g) | 2.6 lbs (1.2 kg) |
| Bluetooth Codecs | aptX | SBC, AAC, LDAC |
| Bluetooth Latency | 150ms (1 speaker) / 500ms (2 speakers stereo) | - |
| Bluetooth Version | 4.2 | 5.2 |
| Drivers | 70mm speaker driver | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| Discontinued | Yes | - |
| Amplifier Power | 15W | 27W |
| Dimensions | 4" x 3" (102 x 76 mm) (diameter x height) | 10.1" x 4.4" x 3.1" (256 x 113 x 79 mm) |
| Digital Aux Input | No | No |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
Related Speaker Comparisons
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Prices on this page were last checked September 22, 2026 at 5:11 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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The Two Speakers In Full
Minirig 2: $140 Discontinued eBay
Pros: Modular, can easily attach a subwoofer. Measured bass extension of 54Hz (-10dB).
Cons: Not stereo. Calls itself splash resistant and has no official water rating. App is buggy. Wireless TWS pairing is buggy. A bit expensive. Has reliability issues more often than any other speaker. Discontinued; Minirig’s current lineup is the Minirig 4, Subwoofer 4 Ultra and Finite MR-79. Discontinued.
Full Minirig 2 review and specifications →
| Amplifier Power | 15W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Aux Latency | 0ms |
| Bass Extension (-10dB) | 54Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX |
| Bluetooth Latency | 150ms (1 speaker) / 500ms (2 speakers stereo) |
| Bluetooth Version | 4.2 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4" x 3" (102 x 76 mm) (diameter x height) |
| Discontinued | Yes |
| Drivers | 70mm speaker driver |
| EQ | Yes |
| IP Rating | Splash resistant |
| Maximum SPL | 95dB (measured by Alan Ross Reviews) |
| Omnidirectional | Pointing up |
| Power Bank | No |
| Power Input | Proprietary USB cable |
| Stereo | No |
| TWS | Yes (cable) |
| Weight | 1.1 lbs (488 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sony ULT Field 3: $138.00 Amazon eBay
Pros: IP67 rated, dustproof and water resistant. 24 hour battery life. App with 10-band EQ. Party Connect with up to 100 speakers. USB-C in/out for charging your phone.
Cons: Sounds a bit hollow, a bit boosted in the treble. Custom EQ and the ULT bass-boost button can’t be used together - turning on ULT disables the EQ. Bass is very weak with ULT off. Lost to the JBL Charge 6 in a side-by-side comparison despite being the larger speaker.
Full Sony ULT Field 3 review and specifications →
| Amplifier Power | 27W |
|---|---|
| App | Yes |
| Aux Input | No |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.1" x 4.4" x 3.1" (256 x 113 x 79 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C, 5V/1.5A) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 2.6 lbs (1.2 kg) |
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