Short answer: the Minirig 3 for modular bass, the Sony ULT Field 3 for IP67 protection. The Minirig 3 is modular and can easily attach a subwoofer, but it is not stereo. The Sony is IP67 rated, dustproof and water resistant yet sounds a bit hollow with boosted treble, and it ranks #60 of 142 against #7 of 142.
The case for the Minirig 3: Modular, can easily attach a subwoofer. The tradeoff: Not stereo.
What the Sony ULT Field 3 gets right: IP67 rated, dustproof and water resistant. Set against that: Sounds a bit hollow, a bit boosted in the treble.
Worth knowing: the Minirig 3 is discontinued, though it still ranks #7 of 142 medium speakers by sound quality, so a used unit beats most of what is still sold new.
Buy the Minirig 3 when sound quality outweighs the price for you, and the Sony ULT Field 3 when the price outweighs sound quality instead.
If water resistance matters to you, the Sony ULT Field 3 at IP67 (brief submersion) holds up far better than the Minirig 3 at Splash resistant (splashing).
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Minirig 3 | Sony ULT Field 3 | |
|---|---|---|
| Price | $140 Discontinued | $138.00 |
| Ranked | #7 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) | 53Hz | - |
| Battery Life | 30 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX, AAC, SBC | SBC, AAC, LDAC |
| Built-in Microphone | No | Yes |
| EQ | Yes | Yes (App + ULT button) |
| IP Rating | Splash resistant | IP67 |
| Bluetooth Latency | 60ms | - |
| Maximum SPL | 105dB (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 (Bluetooth or cable) | Yes |
| Weight | 1.2 lbs (550 g) | 2.6 lbs (1.2 kg) |
| Bluetooth Version | 5.0 | 5.2 |
| Dimensions | 4" x 2.9" (101.6 x 73 mm) (diameter x height) | 10.1" x 4.4" x 3.1" (256 x 113 x 79 mm) |
| Discontinued | Yes | - |
| Drivers | 70mm custom driver | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| Frequency Response | 60Hz - 18kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | 27W |
| Digital Aux Input | No | No |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
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How Minirig 3 compares with other leading options:
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- Minirig 3 vs Minirig 4
- Minirig 2 vs Minirig 3
- B&O Beosound A1 vs Minirig 3
- Minirig 3 vs B&O Beosound A1 2nd gen
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 3: $140 Discontinued eBay
Pros: Modular, can easily attach a subwoofer. Measured bass extension of 53Hz (-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 now sells only the Minirig 4, and the old product page redirects to it. Discontinued.
Full Minirig 3 review and specifications →
| Amplifier Power | 40W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Aux Latency | 0ms |
| Bass Extension (-10dB) | 53Hz |
| Battery Life | 30 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX, AAC, SBC |
| Bluetooth Latency | 60ms |
| Bluetooth Version | 5.0 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4" x 2.9" (101.6 x 73 mm) (diameter x height) |
| Discontinued | Yes |
| Drivers | 70mm custom driver |
| EQ | Yes |
| Frequency Response | 60Hz - 18kHz (Manufacturer specified) |
| IP Rating | Splash resistant |
| Maximum SPL | 105dB (measured by Alan Ross Reviews) |
| Omnidirectional | Pointing up |
| Power Bank | No |
| Power Input | Proprietary USB cable |
| Stereo | No |
| TWS | Yes (Bluetooth or cable) |
| Weight | 1.2 lbs (550 g) |
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: B&O Beoplay A1 2nd gen vs Minirig mk3 bluetooth speaker More from alanrossreviews →
- Alan Ross Reviews: minirig 3 vs minirig 2 - minirig 3 overview part 1
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- Alan Ross Reviews: Minirig 4 vs Minirig 3, stuff they tell you, stuff they don’t! 😂
- Beautiful Zar DJ: MINIRIG 4 Vs MINIRIG 3 (50-100%Volume Audio Test)
- James from Canada: SOUND TESTS - Soundboks, Minirig 3, dB Technologies, Bose S1 Pro, etc - RAVE TEST
- 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) |
- Links
- Reviews, Comparisons and Sound Samples
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