Short answer: these are not really the same kind of speaker, and that is the honest framing here. The Go + Play 3 ranks #3 of 113 boombox speakers by sound quality, while the Xtreme 4 ranks #43 of 120 large speakers, a smaller, more rugged class built for portability rather than home sound.
The Go + Play 3 wins on raw sound quality for its size. Our notes call it the deepest bass out of any speaker in this size, with a sound that is more natural than the previous Go + Play 2. The tradeoff is real: it is just a little over half as loud as the higher rated boomboxes, runs only 8 hours on battery, and carries no water resistance rating at all.
The Xtreme 4 trades some sound quality for genuine portability. Its removable battery lets you swap in a fresh one on the go, something the Go + Play 3 cannot do, and it carries an IP67 rating for dust and water. Our notes flag a dip in the upper bass to midrange that gives it a strange character that can’t be EQ’d out, along with some upper mids and treble boost at high volume, and call it high priced for what it delivers in this class.
Battery life and durability favor the Xtreme 4 outright: 24 hours against the Go + Play 3’s 8 hours, and IP67 water resistance against none.
Buy the Harman Kardon Go + Play 3 if you mostly use a speaker plugged in at home or on a patio and want the deepest, most natural bass in its size class.
Buy the JBL Xtreme 4 if you need something genuinely portable with a swappable battery and real water resistance for outdoor use.
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
| Harman Kardon Go + Play 3 | JBL Xtreme 4 | |
|---|---|---|
| Price | $385 | $309.95 |
| Ranked | #3 of 113 in Boombox Size Portable Bluetooth Speakers | #43 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes (Harman Kardon One app) | Yes |
| Aux Latency | 112ms | - |
| Bass Extension (-10dB) | 35Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (App EQ) | Yes (5 band) |
| IP Rating | None | IP67 |
| Bluetooth Latency | 120ms | 220ms |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) | 106dB (measured by Alan Ross Reviews) |
| Power Input | AC Power brick | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 10.4 lbs (4.7 kg) | 4.6 lbs (2.1 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | SBC |
| Power Bank | Yes | Yes (USB-C) |
| Party Mode | No | Yes (Auracast) |
| USB Playback | No | - |
| Bluetooth Version | 5.2 | 5.3 |
| Amplifier Power | 160W RMS | 100W |
| Dimensions | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) |
| Aux Input | Yes | No |
| Drivers | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators |
| Digital Aux Input | No | No |
| Strap | No | Yes (detachable shoulder strap) |
| Removable Battery | - | Yes |
| Frequency Response | - | 44Hz - 20kHz (Manufacturer specified) |
Watch Them Compared
Videos and reviews that test both speakers side by side.
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