Short answer: the Ultimate Ears Boom 4, if you are buying new. The Minirig 2 ranks higher than it (#9 vs #110 of 164 medium speakers, 4.3/5 vs 2.9/5) but is discontinued, so only consider it used; the Ultimate Ears Boom 4 is still sold new at $149.99.
The Minirig 2 is the better-sounding, longer-running pick. Modular, can easily attach a subwoofer. It is rated for 40 hours of battery against 15 for the Ultimate Ears Boom 4. At 1.1 lbs (488 g) it weighs noticeably less than the Ultimate Ears Boom 4 at 1.4 lbs (620 g). It supports aptX Bluetooth, which the Ultimate Ears Boom 4 lacks. Watch for: Calls itself splash resistant and has no official water rating.
The Ultimate Ears Boom 4 is the tougher choice. IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. It is rated IP67 against Splash resistant for the Minirig 2. It plays in stereo from a single unit, unlike the Minirig 2. Watch for: Not much improvement over the old ones.
Buy the Ultimate Ears Boom 4 if you want one new; the Minirig 2 is discontinued, so only look for it used.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Minirig 2 | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $140 Discontinued | $149.99 |
| Ranked | #9 of 164 in Medium Size Portable Bluetooth Speakers | #110 of 164 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) | 15 hours (Manufacturer specified) |
| Built-in Microphone | No | No |
| EQ | Yes | Yes (via app) |
| IP Rating | Splash resistant | IP67 |
| Maximum SPL | 95dB (measured by Alan Ross Reviews) | 85dBC (Manufacturer specified) |
| Power Bank | No | No |
| Power Input | Proprietary USB cable | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes (cable) | Yes |
| Weight | 1.1 lbs (488 g) | 1.4 lbs (620 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | aptX | SBC |
| Bluetooth Latency | 150ms (1 speaker) / 500ms (2 speakers stereo) | - |
| Bluetooth Version | 4.2 | 5.1 |
| Drivers | 70mm speaker driver | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| Amplifier Power | 15W | - |
| Dimensions | 4” x 3” (102 x 76 mm) (diameter x height) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Digital Aux Input | No | No |
| Strap | - | Yes (built-in loop) |
Related Speaker Comparisons
How Minirig 2 compares with other leading options:
- Earfun Uboom L vs Minirig 2
- Soundcore Motion 300 vs Minirig 2
- Minirig 2 vs Minirig 4
- Minirig 2 vs Minirig 3
- B&O Beosound A1 vs Minirig 2
Prices on this page were last checked October 4, 2026 at 9:58 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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The Two Speakers In Full
Minirig 2: $140 Discontinued eBay
Newer model: the Minirig 4, ranked higher, rated 4.3/5.
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.
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 | Yes |
| 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) |
| 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
Ultimate Ears Boom 4: $149.99 Amazon eBay
Older model: the Ultimate Ears Boom 3 (ranked lower, rated 2.9/5).
Pros: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app.
Cons: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 85dBC (Manufacturer specified) |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.4 lbs (620 g) |
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