Short answer: the Ultimate Ears Megaboom 4, if you are buying new. The Minirig 2 ranks higher than it (#9 vs #159 of 164 medium speakers, 4.3/5 vs 2.1/5) but is discontinued, so only consider it used; the Ultimate Ears Megaboom 4 is still sold new at $200.
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 20 for the Ultimate Ears Megaboom 4. At 1.1 lbs (488 g) it weighs much less than the Ultimate Ears Megaboom 4 at 2.4 lbs (1.1 kg). It supports aptX Bluetooth, which the Ultimate Ears Megaboom 4 lacks. The tradeoff: Calls itself splash resistant and has no official water rating.
The Ultimate Ears Megaboom 4 is the tougher pick. IP67 rated, floats, and finally uses USB-C charging. It is rated IP67 against Splash resistant for the Minirig 2. Watch for: A lot of distortion at higher volumes.
Buy the Ultimate Ears Megaboom 4, since the Minirig 2 is discontinued and only worth hunting down used.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Minirig 2 | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $140 Discontinued | $200 |
| Ranked | #9 of 164 in Medium Size Portable Bluetooth Speakers | #159 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) | 20 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) | 91dB (Manufacturer specified) |
| Power Bank | No | - |
| Power Input | Proprietary USB cable | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Yes |
| TWS | Yes (cable) | Yes |
| Weight | 1.1 lbs (488 g) | 2.4 lbs (1.1 kg) |
| 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 50x50mm full-range + 2x 55x86mm passive radiators |
| Amplifier Power | 15W | - |
| Dimensions | 4” x 3” (102 x 76 mm) (diameter x height) | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Digital Aux Input | No | No |
| Party Mode | - | Yes (PartyUp up to 50 speakers) |
| Strap | - | Yes (built-in loop) |
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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 Megaboom 4: $200 Amazon eBay
Older model: the Ultimate Ears Megaboom 3 (ranked higher, rated 3/5).
Pros: IP67 rated, floats, and finally uses USB-C charging. 20 hour battery life. ‘PartyUp’ feature syncs multiple UE speakers together.
Cons: A lot of distortion at higher volumes. Rolled off treble. Not very loud. They really screwed this up
Full Ultimate Ears Megaboom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Drivers | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 91dB (Manufacturer specified) |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 2.4 lbs (1.1 kg) |
- Links
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