Short answer: the Minirig 4. It ranks #7 of 177 medium speakers by sound quality, rated 4.3/5, at $229.95. The Ultimate Ears Wonderboom 2 ranks #110, rated 2.9/5, at $80, $149.95 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Minirig 4 is the better-sounding, deeper-bass choice. A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery. Its bass reaches about 56Hz before falling 10dB, against 82Hz for the Ultimate Ears Wonderboom 2. Alan Ross Reviews measured it at 106dB at full volume, against 88dB for the Ultimate Ears Wonderboom 2. It is rated for 30 hours of battery against 12 for the Ultimate Ears Wonderboom 2. The tradeoff: Calls itself splash resistant and has no official water rating.
The Ultimate Ears Wonderboom 2 is the lighter, tougher choice. A small waterproof speaker that floats and is light enough to toss in a bag for the pool or beach. At 0.9 lbs (420 g) it weighs noticeably less than the Minirig 4 at 1.2 lbs (550 g). It is rated IP67 against Splash resistant for the Minirig 4. The catch: Not stereo, barely any bass, recessed treble.
Buy the Minirig 4. It is rated higher for sound quality, and the $149.95 you would save on the Ultimate Ears Wonderboom 2 does not close the gap.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery.
A small waterproof speaker that floats and is light enough to toss in a bag for the pool or beach.
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
| Minirig 4 | Ultimate Ears Wonderboom 2 | |
|---|---|---|
| Price | $229.95 | $80 |
| Ranked | #7 of 177 in Medium Size Portable Bluetooth Speakers | #110 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | No |
| Aux Latency | 0ms | - |
| Bass Extension (-10dB) | 56Hz | 82Hz |
| Battery Life | 30 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC |
| EQ | Yes | No |
| IP Rating | Splash resistant | IP67 |
| Bluetooth Latency | 60ms | - |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | 88dB (measured by Alan Ross Reviews) |
| Power Bank | Yes (USB-C) | - |
| Power Input | USB-C | Micro USB |
| Stereo | No | No |
| Omnidirectional | Pointing up | Yes |
| TWS | Yes (Bluetooth or cable) | Yes |
| Weight | 1.2 lbs (550 g) | 0.9 lbs (420 g) |
| Bluetooth Version | 5.0 | 5.1 |
| Dimensions | 4” x 2.9” (101.6 x 73 mm) (diameter x height) | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 70mm custom driver | 2x 40mm active drivers + 2x passive radiators |
| Frequency Response | 60Hz - 18kHz (Manufacturer specified) | - |
| Amplifier Power | 50W | - |
| Built-in Microphone | Yes | No |
| Digital Aux Input | No | No |
| Party Mode | - | No |
| Strap | - | Yes (built-in loop) |
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