Short answer: the Harman Kardon Go + Play 3, if you are buying new. The EarFun Uboom X ranks higher than it (#1 vs #3 of 113 boombox speakers, 4.7/5 vs 4.4/5) but is discontinued, so only consider it used; the Harman Kardon Go + Play 3 is still sold new at $385.
Buy the Harman Kardon Go + Play 3 new; the EarFun Uboom X is no longer sold new, so it only makes sense as a used find.
If battery life is a priority, the EarFun Uboom X is rated for 30 hours versus 8 hours for the Harman Kardon Go + Play 3.
If water resistance matters to you, the EarFun Uboom X at IP67 (brief submersion) holds up far better than the Harman Kardon Go + Play 3 at no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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
| EarFun Uboom X | Harman Kardon Go + Play 3 | |
|---|---|---|
| Price | $159.99 Discontinued | $385 |
| Ranked | #1 of 113 in Boombox Size Portable Bluetooth Speakers | #3 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (Earfun Audio app) | Yes (Harman Kardon One app) |
| Aux Input | Yes | Yes |
| Aux Latency | 16ms | 112ms |
| Bass Extension (-10dB) | ~38Hz | 35Hz |
| Battery Life | 30 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC, AAC |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (App EQ) | Yes (App EQ) |
| IP Rating | IP67 | None |
| Bluetooth Latency | SBC Video mode 48ms, AAC Video mode 128ms, SBC 112ms, AAC 176ms | 120ms |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | 103dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Party Connect mode, up to 50 speakers) | No |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | AC Power brick |
| TWS | Yes | Yes |
| Weight | 9 lbs (4.1 kg) | 10.4 lbs (4.7 kg) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| USB Playback | No | No |
| FM Tuner | No | - |
| Bluetooth Version | 5.3 | 5.2 |
| Amplifier Power | 80W | 160W RMS |
| Dimensions | 15.7” x 5.9” x 8.5” (400 x 150 x 215 mm) | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) |
| Drivers | 2x 102mm (4”) woofers + 2x 20mm tweeters | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | Yes (detachable shoulder strap) | No |
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