Short answer: the Harman Kardon Go + Play 3 on sound, the W-King X20 on output. The X20 claims 200W RMS and 330W peak, 112dB max volume, a 24-hour battery that doubles as a power bank and IPX6 waterproofing, but its response rises into rolled-off upper treble with peaks at 700Hz and 1.2kHz. The Go + Play 3 ranks #3 of 113 and is warm with boosted bass, though only a little over half as loud as the higher-rated boomboxes.
Buy the Harman Kardon Go + Play 3. It is rated higher for sound quality, and the $155.01 you would save on the W-King X20 does not close the gap.
There is a real gap in water resistance: the W-King X20 at IPX6 (powerful water jets) against the Harman Kardon Go + Play 3, which has no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| Harman Kardon Go + Play 3 | W-King X20 | |
|---|---|---|
| Price | $385 | $229.99 after coupon |
| Ranked | #3 of 113 in Boombox Size Portable Bluetooth Speakers | #43 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (Harman Kardon One app) | Yes (W-King app) |
| Aux Latency | 112ms | - |
| Bass Extension (-10dB) | 35Hz | ~42Hz |
| Battery Life | 8 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | Yes (App EQ) | Yes (App + button modes) |
| IP Rating | None | IPX6 |
| Bluetooth Latency | 120ms | - |
| Maximum SPL | 103dB (measured by Alan Ross Reviews) | 112dB (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) | 15.9 lbs (7200 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | SBC |
| Power Bank | Yes | Yes (USB-A) |
| Party Mode | No | No |
| USB Playback | No | Yes |
| Bluetooth Version | 5.2 | 5.4 |
| Amplifier Power | 160W RMS | 330W peak / 200W RMS |
| Dimensions | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) | 19.9” x 8.5” x 10.6” (506 x 217 x 270 mm) |
| Aux Input | Yes | Yes |
| Drivers | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters | 7.5” subwoofer + drivers |
| Digital Aux Input | No | No |
| Strap | No | - |
| MicroSD Playback | - | Yes |
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