These are not really the same size class, and that is the honest framing here. The JBL Go 4 ranks #30 of 62 small speakers by sound quality at $49.95; the Ultimate Ears Wonderboom 4 ranks #109 of 179 medium speakers by sound quality at $64.99.
The JBL Go 4 is the lighter option. A pocket sized waterproof mini speaker with a loop for hanging and app EQ. At 0.4 lbs (190 g) it weighs much less than the Ultimate Ears Wonderboom 4 at 0.9 lbs (420 g). It links with other speakers (Auracast), which the Ultimate Ears Wonderboom 4 cannot. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks. The catch: Not much bass at all, especially with electronic/bass-heavy tracks pushed past ~50% volume.
The Ultimate Ears Wonderboom 4 is the longer-running choice. A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips. It is rated for 14 hours of battery against 7 for the JBL Go 4. Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the JBL Go 4 at $49.95 if you want a small speaker. Buy the Ultimate Ears Wonderboom 4 at $64.99 if you want a medium speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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
| JBL Go 4 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $49.95 | $64.99 |
| Ranked | #30 of 62 in Small Size Portable Bluetooth Speakers | #109 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | ~82Hz | - |
| Battery Life | 7 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| EQ | Yes | No |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Auracast) | No |
| Power Bank | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Yes |
| TWS | Yes | Yes |
| Weight | 0.4 lbs (190 g) | 0.9 lbs (420 g) |
| Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | No |
| Bluetooth Version | 5.3 | 5.2 |
| Frequency Response | 90Hz - 20kHz (Manufacturer specified) | - |
| Dimensions | 3.7” x 3” x 1.7” (94.3 x 75.7 x 42.2 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Charging Time | 3 hours | - |
| Drivers | 45mm | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| Amplifier Power | 4.2W | - |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | Yes (built-in loop) |
| Maximum SPL | - | 87dB (Manufacturer specified) |
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