Short answer: the Sony ULT Field 3 for better sound quality, the Ultimate Ears Wonderboom 2 for the lower price. The Sony XB33 ranks higher than the Ultimate Ears Wonderboom 2 (#77 vs #111 of 175 medium speakers) but is discontinued. Its replacement, the Sony ULT Field 3, is rated 3.4/5 at $208; the Ultimate Ears Wonderboom 2 is rated 2.9/5 at $80, $128 cheaper.
The Sony XB33 is the better-sounding, deeper-bass choice. IP67 rated and lightweight (2.4 lb). Its bass reaches about 50Hz before falling 10dB, against 82Hz for the Ultimate Ears Wonderboom 2. Alan Ross Reviews measured it at 97dB at full volume, against 88dB for the Ultimate Ears Wonderboom 2. It is rated for 24 hours of battery against 12 for the Ultimate Ears Wonderboom 2. The tradeoff: Not very loud.
The Ultimate Ears Wonderboom 2 is the lighter pick. IP67 rated and floats. At 0.9 lbs (420 g) it weighs much less than the Sony XB33 at 2.4 lbs (1.1 kg). Watch for: Not stereo, barely any bass, recessed treble.
Buy the Ultimate Ears Wonderboom 2 if price matters most. For better sound quality, the Sony ULT Field 3, the replacement for the discontinued Sony XB33, is rated higher but costs $208.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Sony XB33 | Ultimate Ears Wonderboom 2 | |
|---|---|---|
| Price | $110 Discontinued | $80 |
| Ranked | #77 of 175 in Medium Size Portable Bluetooth Speakers | #111 of 175 in Medium Size Portable Bluetooth Speakers |
| App | Yes (Sony Music Connect App) | No |
| Aux Input | No | No |
| Bass Extension (-10dB) | 50Hz | 82Hz |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| Bluetooth Latency | 110ms | - |
| EQ | Yes (3 band) | No |
| IP Rating | IP67 | IP67 |
| Maximum SPL | 97dB (measured by Alan Ross Reviews) | 88dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-A) | - |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| Weight | 2.4 lbs (1.1 kg) | 0.9 lbs (420 g) |
| Bluetooth Version | 5.0 | 5.1 |
| Dimensions | 9.7” x 3.8” x 4.2” (246 x 97 x 106 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Amplifier Power | 16W RMS | - |
| Drivers | 2x 48x70mm X-Balanced racetrack drivers + 2x passive radiators | 2x 40mm active drivers + 2x passive radiators |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Power Input | USB-C | Micro USB |
| TWS | Yes | Yes |
| Built-in Microphone | - | No |
| Strap | - | Yes (built-in loop) |
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- JBL Charge 6 vs Sony XB33
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Prices on this page were last checked October 12, 2026 at 4:13 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
Sony XB33: $110 Discontinued eBay
Newer model: the Sony ULT Field 3, ranked higher, rated 3.4/5, released Apr 2025.
Older models: the Sony SRS-XB31 (ranked lower, rated 2.8/5) and the Sony SRS-XB30 (ranked lower, rated 2.6/5). See every Sony XB and ULT generation.
Pros: IP67 rated and lightweight (2.4 lb). App-controlled color LED lighting, Party Connect links up to 100 speakers. ~19 hour real-world battery without lights. Measured bass extension of 50Hz (-10dB).
Cons: Not very loud. Upper bass peaks, midrange dip, upper midrange peaks, not very neutral. Speaker will not remain at max volume and will turn itself down automatically. Discontinued.
Full Sony XB33 review and specifications →
| Released | May 2020 (6 years ago) |
|---|---|
| Amplifier Power | 16W RMS |
| App | Yes (Sony Music Connect App) |
| Aux Input | No |
| Bass Extension (-10dB) | 50Hz |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Latency | 110ms |
| Bluetooth Version | 5.0 |
| Digital Aux Input | No |
| Dimensions | 9.7” x 3.8” x 4.2” (246 x 97 x 106 mm) |
| Drivers | 2x 48x70mm X-Balanced racetrack drivers + 2x passive radiators |
| EQ | Yes (3 band) |
| IP Rating | IP67 |
| Lights | Yes |
| Maximum SPL | 97dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-A) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 2.4 lbs (1.1 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Sony XB33 vs XB32 vs JBL Charge 4 best £120 bluetooth speaker? More from alanrossreviews →
- Alan Ross Reviews: Sony XB23 vs XB33 - specs and measurements
- Alan Ross Reviews: Sony xb33 vs xb43 vs Soundcore Motion Plus speakers test
- Alan Ross Reviews: JBL Charge 5 vs Motion Plus and Sony XB33 - ultimate travel speaker 2021 🤗
- Alan Ross Reviews: LG Xboom Go PL7 vs JBL Charge 4 and Sony XB33 - best Bluetooth speaker?
- Alan Ross Reviews: Tribit Xsound Mega vs the world! (JBL Charge 5, Bose Flex, Sony XB33, LG PL7) 👍
- GYMCADDY: Sony XE300 Review And Compared to Sony XB33 - A Muffled Mess More from GYMCADDY →
- Head-to-Head Comparisons
Ultimate Ears Wonderboom 2: $80 Amazon $80 eBay
Newer model: the Ultimate Ears Wonderboom 4, ranked higher, rated 2.9/5, released Jun 2024.
Older model: the Ultimate Ears Wonderboom (ranked lower, rated 2.9/5). See every Ultimate Ears Wonderboom, Boom and Megaboom generation.
Pros: IP67 rated and floats. Compact and light enough to toss in a bag. Measured bass extension of 82Hz (-10dB).
Cons: Not stereo, barely any bass, recessed treble. Slightly boosted 93Hz upper bass Dip at 9kHz. You can tell from the micro USB that they are just feeding you the same crap hardware over and over, this is inexcusable for a product released in 2019. Not technically a 360 speaker, only front and rear.
Full Ultimate Ears Wonderboom 2 review and specifications →
| Released | Jun 2019 (7 years ago) |
|---|---|
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 82Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators |
| EQ | No |
| IP Rating | IP67 |
| Maximum SPL | 88dB (measured by Alan Ross Reviews) |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Input | Micro USB |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 0.9 lbs (420 g) |
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: The biggest upgrade since time began! 💪 More from alanrossreviews →
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- Alan Ross Reviews: Soundcore Flare 2 - mega 360 degree speaker shootout!
- Danny Pops: MICRO SPEAKERS - my take on JBL Clip 4 VS Wonderboom 2 VS Bose Micro More from DannyPops →
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