Short answer: both are discontinued, so this only matters if you are buying used. Used, the JBL Flip 4 is the better pick: it ranks #83 of 175 medium speakers by sound quality (rated 3.3/5), against #112 (rated 2.9/5) for the Ultimate Ears Wonderboom. If you want one new, the JBL Flip 7 replaces the JBL Flip 4 and is rated 4.2/5 at $89.95.
The JBL Flip 4 is the better-sounding choice. At 1.1 lbs (510 g), JBL Flip 4 combines 2x 40mm fullrange with Bluetooth and aux. It keeps a wired aux input, which the Ultimate Ears Wonderboom lacks. It links with other speakers (Connect+ up to 100 speakers), which the Ultimate Ears Wonderboom cannot. It plays in stereo from a single unit, unlike the Ultimate Ears Wonderboom. The tradeoff: Battery failures are common.
The case for the Ultimate Ears Wonderboom: IP67 rated and floats. The catch: Not stereo, barely any bass, recessed treble.
Buy the JBL Flip 4 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, buy the JBL Flip 7, which replaces the JBL Flip 4.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| JBL Flip 4 | Ultimate Ears Wonderboom | |
|---|---|---|
| Price | $70 Discontinued | $79 Discontinued |
| Ranked | #83 of 175 in Medium Size Portable Bluetooth Speakers | #112 of 175 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 66Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 10 hours (Manufacturer specified) |
| Bluetooth Latency | 300ms | - |
| Party Mode | Yes (Connect+ up to 100 speakers) | No |
| Power Input | Micro USB | Micro USB |
| TWS | No | Yes |
| Weight | 1.1 lbs (510 g) | 0.9 lbs (425 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | - |
| Drivers | 2x 40mm fullrange | 2x 1.6” active drivers + 2x 1.8” x 2.6” passive radiators |
| Dimensions | 6.9” x 2.8” x 2.6” (175 x 70 x 65 mm) | 4” x 3.7” (102 x 93.5 mm) |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 16W RMS | - |
| IP Rating | IPX7 | IPX7 |
| Maximum SPL | 92dB (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| Omnidirectional | No | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| App | Yes | No |
| EQ | No | No |
| Stereo | Yes | No |
| Strap | Yes (lanyard) | Yes (built-in loop) |
| Built-in Microphone | - | No |
Watch Them Compared
Videos and reviews that test both speakers side by side.
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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
JBL Flip 4: $70 Discontinued Amazon $70 eBay
Newer model: the JBL Flip 7, ranked higher, rated 4.2/5, released Mar 2025. See every JBL Flip generation.
Pros: At 510 g, JBL Flip 4 combines 2x 40mm fullrange with Bluetooth and aux. Claimed 12 hours (manufacturer specified) battery life, ipx7 protection, up to 92db and single-box playback make its feature set practical for its intended room or portable use. Measured bass extension of 66Hz (-10dB).
Cons: Bass is limited by its 66Hz specification. There is no companion app. No EQ adjustment. Battery failures are common. Discontinued.
Full JBL Flip 4 review and specifications →
| Released | Feb 2017 (9 years ago) |
|---|---|
| Amplifier Power | 16W RMS |
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | 66Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 300ms |
| Bluetooth Version | 4.2 |
| Digital Aux Input | No |
| Dimensions | 6.9” x 2.8” x 2.6” (175 x 70 x 65 mm) |
| Drivers | 2x 40mm fullrange |
| EQ | No |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 92dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Input | Micro USB |
| Stereo | Yes |
| Strap | Yes (lanyard) |
| TWS | No |
| Weight | 1.1 lbs (510 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Ultimate Ears Wonderboom: $79 Discontinued eBay
Newer model: the Ultimate Ears Wonderboom 4, ranked higher, rated 2.9/5, released Jun 2024. See every Ultimate Ears Wonderboom, Boom and Megaboom generation.
Pros: IP67 rated and floats. Compact, light, and simple to use.
Cons: Not stereo, barely any bass, recessed treble. Dip at 9kHz. Low mid bass distortion. Not technically a 360 speaker, only front and rear. Discontinued.
Full Ultimate Ears Wonderboom review and specifications →
| Released | Nov 2017 (8 years ago) |
|---|---|
| App | No |
| Aux Input | No |
| Battery Life | 10 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4” x 3.7” (102 x 93.5 mm) |
| Drivers | 2x 1.6” active drivers + 2x 1.8” x 2.6” passive radiators |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Input | Micro USB |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 0.9 lbs (425 g) |
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