Short answer: the Harman Kardon Go + Play 3. It ranks #3 of 113 boombox speakers by sound quality (rated 4.4/5); the Teufel Boomster 4 ranks #50 (rated 3.4/5).
Side by side, the Go + Play 3 sounds better. In a direct comparison it was fuller with deeper, harder hitting bass, softer highs and a more natural stereo image. The Boomster 4 was sharper and thinner in the highs, with weaker bass, though a bit louder and with a wide, open stereo image.
Radio and weather: the Boomster 4 has DAB+ and FM, IPX5, and a claimed 23 hours of battery. The Go + Play 3 has no water rating and claims 8 hours.
Weight: 8.3 lbs (3.75 kg) for the Boomster 4 against 10.4 lbs (4.7 kg) for the Go + Play 3. Both have an aux input and stereo pairing.
Buy the Harman Kardon Go + Play 3. It is rated higher for sound quality than the Teufel Boomster 4.
There is a real gap in water resistance: the Teufel Boomster 4 at IPX5 (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 | Teufel Boomster 4 | |
|---|---|---|
| Price | $385 | €249.99 |
| Ranked | #3 of 113 in Boombox Size Portable Bluetooth Speakers | #50 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) | 23 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | Yes (App EQ) | Yes (treble control) |
| IP Rating | None | IPX5 |
| 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) | 8.3 lbs (3.75 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | aptX HD, AAC, SBC |
| Power Bank | Yes | No |
| Party Mode | No | - |
| USB Playback | No | - |
| Bluetooth Version | 5.2 | 5.0 |
| Amplifier Power | 160W RMS | 42W RMS |
| Dimensions | 17.3” x 9.4” x 7.6” (439 x 240 x 192 mm) | 7.1”H x 14.6”W x 5.8”D (180 x 370 x 148 mm) |
| Aux Input | Yes | Yes |
| Drivers | 1x 130mm (5”) subwoofer + 2x 70mm midrange drivers + 2x 20mm tweeters | 2x 20mm tweeters + 2x 65mm midrange drivers + 1x 110mm (4.3”) woofer, passive bass radiators |
| Digital Aux Input | No | - |
| Strap | No | No |
| FM Tuner | - | Yes (plus DAB+) |
Watch Them Compared
Videos and reviews that test both speakers side by side.
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