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 Boom 4 ranks #112, rated 2.9/5, at $114.99, $114.96 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Ultimate Ears Boom 4 is the tougher pick. A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. It is rated IP67 against Splash resistant for the Minirig 4. It plays in stereo from a single unit, unlike the Minirig 4. The tradeoff: Not much improvement over the old ones.
The Minirig 4 is the better-sounding, longer-running option. A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery. It is rated for 30 hours of battery against 15 for the Ultimate Ears Boom 4. It supports AAC Bluetooth, which the Ultimate Ears Boom 4 lacks. It keeps a wired aux input, which the Ultimate Ears Boom 4 lacks. The tradeoff: Calls itself splash resistant and has no official water rating.
Buy the Minirig 4. It is rated higher for sound quality, and saving $114.96 with the Ultimate Ears Boom 4 does not make up for the sound-quality gap.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers.
A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery.
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
| Ultimate Ears Boom 4 | Minirig 4 | |
|---|---|---|
| Price | $114.99 | $229.95 |
| Ranked | #112 of 177 in Medium Size Portable Bluetooth Speakers | #7 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| IP Rating | IP67 | Splash resistant |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | Pointing up |
| Weight | 1.4 lbs (620 g) | 1.2 lbs (550 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 5.0 |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) | 4” x 2.9” (101.6 x 73 mm) (diameter x height) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators | 70mm custom driver |
| TWS | Yes | Yes (Bluetooth or cable) |
| EQ | Yes (via app) | Yes |
| Built-in Microphone | No | Yes |
| Power Bank | No | Yes (USB-C) |
| Aux Input | No | Yes |
| Maximum SPL | 85dBC (Manufacturer specified) | 106dB (measured by Alan Ross Reviews) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | AAC, SBC |
| Strap | Yes (built-in loop) | - |
| Aux Latency | - | 0ms |
| Bass Extension (-10dB) | - | 56Hz |
| Bluetooth Latency | - | 60ms |
| Frequency Response | - | 60Hz - 18kHz (Manufacturer specified) |
| Amplifier Power | - | 50W |
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