Short answer: the Earfun Uboom Slim. It ranks #41 of 150 medium speakers by sound quality, rated 3.7/5, at $79; the JBL Charge 3 ranks #77, rated 3.2/5, and costs $80, which makes this an easy call rather than a real tradeoff.
The case for the Earfun Uboom Slim: Excellent pricing, strong waterproof build (IPX7), good battery life (16 hours), smooth sound with volume compensation, speakerphone capability. The catch: Not as deep bass as others.
What the JBL Charge 3 does well: Doubles as a 6000mAh power bank for USB devices. ~20 hour battery life. The catch: Less clarity than the Flip 4.
One note: the JBL Charge 3 is no longer in production and isn’t widely stocked new anymore.
Buy the Earfun Uboom Slim. It is rated higher for sound quality than the JBL Charge 3 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Earfun Uboom Slim | JBL Charge 3 | |
|---|---|---|
| Price | $79 | $80 Discontinued |
| Ranked | #41 of 150 in Medium Size Portable Bluetooth Speakers | #77 of 150 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~63Hz | 63Hz |
| Battery Life | 16 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Power Input | USB-C | Micro USB |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 1.2 lbs (560 g) | 1.8 lbs (800 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 5.2 | 4.1 |
| Built-in Microphone | Yes | Yes |
| Drivers | 45mm speaker drivers | 2x 50mm fullrange |
| Amplifier Power | 20W | 20W RMS |
| IP Rating | IPX7 | IPX7 |
| Digital Aux Input | No | No |
| Dimensions | 2.6”H x 7.1”W x 2.6”D (65 x 180 x 65 mm) | 8.4” x 3.5” x 3.5” (213 x 88 x 88 mm) |
| App | No | Yes (JBL Connect) |
| Aux Input | Yes | Yes |
| EQ | No | No |
| TWS | Yes | No |
| Maximum SPL | - | 100dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Connect+ up to 100 speakers) |
| Power Bank | - | Yes (USB-A, 5V/2A) |
| Frequency Response | - | 65Hz - 20kHz (Manufacturer specified) |
Related Speaker Comparisons
More top alternatives to Earfun Uboom Slim:
- Earfun Uboom L vs Earfun Uboom Slim
- Soundcore Motion 300 vs Earfun Uboom Slim
- JBL Charge 6 vs Earfun Uboom Slim
- JBL Flip 6 vs Earfun Uboom Slim
- JBL Flip 7 vs Earfun Uboom Slim
Prices on this page were last checked September 30, 2026 at 2:57 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
Earfun Uboom Slim: $79 eBay
Pros: Excellent pricing, strong waterproof build (IPX7), good battery life (16 hours), smooth sound with volume compensation, speakerphone capability. Measured bass extension of ~63Hz (-10dB).
Cons: Not as deep bass as others. Warm tuned, peaks in the mids and lower treble, rolled off upper treble
Full Earfun Uboom Slim review and specifications →
| Amplifier Power | 20W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~63Hz |
| Battery Life | 16 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 2.6”H x 7.1”W x 2.6”D (65 x 180 x 65 mm) |
| Drivers | 45mm speaker drivers |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.2 lbs (560 g) |
- Reviews, Comparisons and Sound Samples
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JBL Charge 3: $80 Discontinued eBay
Newer model: the JBL Charge 6, ranked higher, rated 4.2/5.
Pros: Doubles as a 6000mAh power bank for USB devices. ~20 hour battery life. IPX7 rated; built-in noise/echo-cancelling speakerphone. Measured bass extension of 63Hz (-10dB).
Cons: Less clarity than the Flip 4. Battery failures are common. Discontinued.
Full JBL Charge 3 review and specifications →
| Amplifier Power | 20W RMS |
|---|---|
| App | Yes (JBL Connect) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 63Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 4.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 8.4” x 3.5” x 3.5” (213 x 88 x 88 mm) |
| Drivers | 2x 50mm fullrange |
| EQ | No |
| Frequency Response | 65Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 100dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Bank | Yes (USB-A, 5V/2A) |
| Power Input | Micro USB |
| Stereo | Yes |
| TWS | No |
| Weight | 1.8 lbs (800 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: JBL Charge 5 vs JBL Charge 4 and Charge 3 - best JBL charge 5 review 2021? More from alanrossreviews →
- Alan Ross Reviews: JBL Flip 6 vs JBL Charge 4 and JBL Charge 3 - small one or a large one? 🤷♂️
- DLX Willington: JBL Flip 5 vs Flip 4 :Sound Battle: Almost to the size of the JBL Charge 3? More from DLXWillington →
- EnforcerMan: JBL CHARGE 3 VS TREBLAB HD77 - FULL REVIEW
- Head-to-Head Comparisons