Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Soundcore Boom 2 ranks #10 of 108 large speakers by sound quality at $99.99; the Ultimate Ears Wonderboom 4 ranks #106 of 173 medium speakers by sound quality at $64.99.
The Soundcore Boom 2 is the longer-running option. A 3.7 lbs (1.68 kg) IPX7 waterproof speaker with pretty deep bass for its size (47Hz at -10dB), 105dB maximum SPL and 24-hour battery life. It is rated for 24 hours of battery against 14 for the Ultimate Ears Wonderboom 4. It links with other speakers (PartyCast 2.0 up to 100 speakers), which the Ultimate Ears Wonderboom 4 cannot. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks. The catch: Only a single midrange driver, so you only get stereo for the tweeters.
The Ultimate Ears Wonderboom 4 is the lighter pick. A small 0.9 lbs (420 g) IP67 waterproof 360 degree speaker with 14-hour battery life and a built-in strap loop. At 0.9 lbs (420 g) it weighs much less than the Soundcore Boom 2 at 3.7 lbs (1.68 kg). Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Soundcore Boom 2 ($99.99) for a large speaker; the Ultimate Ears Wonderboom 4 ($64.99) suits a medium speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A 1.68 kg IPX7 waterproof speaker with pretty deep bass for its size (47Hz at -10dB), 105dB maximum SPL and 24-hour battery life.
Amazon $99.99 B&H Photo Video Soundcore $139.99 eBay
A small 420 g IP67 waterproof 360 degree speaker with 14-hour battery life and a built-in strap loop.
Amazon $64.99 eBayPrices on this page were last checked October 19, 2026 at 10:32 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
| Soundcore Boom 2 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $99.99 | $64.99 |
| Ranked | #10 of 108 in Large Size Portable Bluetooth Speakers | #106 of 173 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | No |
| Bass Extension (-10dB) | 47Hz | - |
| Battery Life | 24 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | No | No |
| EQ | Yes | No |
| IP Rating | IPX7 | IP67 |
| Bluetooth Latency | 125ms | - |
| Maximum SPL | 105dB (measured by Alan Ross Reviews) | 87dB (Manufacturer specified) |
| MicroSD Playback | No | - |
| Party Mode | Yes (PartyCast 2.0 up to 100 speakers) | No |
| Power Bank | Yes (USB-A) | No |
| Power Input | USB-C | USB-C |
| Stereo | Partially (1 woofer) | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 3.7 lbs (1.68 kg) | 0.9 lbs (420 g) |
| Bluetooth Version | 5.3 | 5.2 |
| Dimensions | 11.7” x 7.3” x 4” (297 x 185 x 102 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 120mm x 90mm woofer, 2x 20mm tweeters | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 80W | - |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | No | Yes (built-in loop) |
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