Short answer: the Harman Kardon Go + Play 3. It ranks #3 of 113 against #73 of 113 for the ZZA K8. The K8 is described as completely insane value for the money at $40, but its frequency response is a very V curve and it can be harsh in the treble, so the Go + Play 3’s warm boosted bass is the safer buy.
Buy the Harman Kardon Go + Play 3. It is rated higher for sound quality; the ZZA K8 is no longer sold new.
If battery life is a priority, the ZZA K8 is rated for 30 hours versus 8 hours for the Harman Kardon Go + Play 3.
If water resistance matters to you, the ZZA K8 at IPX6 (powerful water jets) holds up far better than the Harman Kardon Go + Play 3 at no water resistance.
Looking for alternatives? See the complete Portable Bluetooth rankings.
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Specifications Side By Side
| Harman Kardon Go + Play 3 | ZZA K8 | |
|---|---|---|
| Price | $385 | $40 after clipped coupon, Discontinued |
| Ranked | #3 of 113 in Boombox Size Portable Bluetooth Speakers | #73 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (Harman Kardon One app) | No |
| Aux Latency | 112ms | - |
| Bass Extension (-10dB) | 35Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | ~30 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | Yes (App EQ) | No |
| IP Rating | None | IPX6 |
| Bluetooth Latency | 120ms | - |
| Maximum SPL | 103dB (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) | 6.8 lbs (3.1 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | SBC |
| Power Bank | Yes | Yes (USB-A) |
| Party Mode | No | No |
| USB Playback | No | No |
| Bluetooth Version | 5.2 | - |
| Amplifier Power | 160W RMS | - |
| Dimensions | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) | - |
| Aux Input | Yes | Yes |
| Drivers | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters | 8” woofer + tweeters |
| Digital Aux Input | No | No |
| Strap | No | - |
| Outputs | - | Aux |
| Microphone Input | - | Yes |
| Wireless Microphones | - | Yes 2 Included |
| FM Tuner | - | No |
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