Short answer: the JBL Xtreme 4. It ranks #43 of 120 large speakers by sound quality, rated 3.8/5, at $309.95; the Turtlebox Cub ranks #85, rated 3.0/5, and costs $330, so there is not much of a tradeoff to weigh.
The Xtreme 4 has the stronger evidence. Reviews find it clear, punchy and refined with a detailed midrange, and it measured about 106dB. The Cub has only listening impressions so far: loud, warm and bass-forward, losing some bass at high volume.
Both are IP67. The Xtreme 4 adds a replaceable battery, a 5-band app EQ, Auracast and stereo from one unit. The Cub is mono from one unit, with Party Mode and stereo pairing.
Size and battery: the Xtreme 4 is 4.6 lbs (2.1 kg) with a claimed 24 hours. The Cub is 5.3 lbs (2.4 kg) with a claimed 14+ hours. Both have a USB-C power bank.
Buy the JBL Xtreme 4. It is rated higher for sound quality than the Turtlebox Cub and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Portable Bluetooth rankings.
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Specifications Side By Side
| JBL Xtreme 4 | Turtlebox Cub | |
|---|---|---|
| Price | $309.95 | $330.00 |
| Ranked | #43 of 120 in Large Size Portable Bluetooth Speakers | #85 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes | - |
| Aux Input | No | - |
| Battery Life | 24 hours (Manufacturer specified) | 14+ hours (Manufacturer specified) |
| EQ | Yes (5 band) | - |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 220ms | - |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Auracast) | Yes (Party Mode) |
| Power Bank | Yes (USB-C) | Yes (USB-C) |
| Power Input | USB-C | USB-C |
| Removable Battery | Yes | - |
| TWS | Yes | Yes |
| Weight | 4.6 lbs (2.1 kg) | 5.3 lbs (2.4 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | - |
| Built-in Microphone | Yes | - |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| Bluetooth Version | 5.3 | 5.4 |
| Dimensions | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) | 8.6”H x 7.2”W x 5.7”D (218 x 183 x 146 mm) |
| Drivers | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators | 1x 4.5” (114mm) woofer + 1x 1.3” (33mm) titanium tweeter |
| Frequency Response | 44Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 100W | - |
| Digital Aux Input | No | - |
| Strap | Yes (detachable shoulder strap) | No |
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