Short answer: the Soundcore Boom 3i. It ranks #31 of 179 medium speakers by sound quality, rated 4.0/5, at $118.99. The Teufel Rockster Go 2 ranks #93, rated 3.2/5, at $99.99, $19 cheaper, which does not close the gap in sound quality.
The Soundcore Boom 3i is the better-sounding pick. A warm, punchy waterproof speaker that sounds great and is a strong value. Watch for: Not quite as good as a JBL Charge 5, doesn’t go quite as loud or sound quite as balanced, but very very close.
What the Teufel Rockster Go 2 does well: A light, rugged waterproof speaker with very long battery life in eco mode, stereo pairing and a tripod mount. It links with other speakers (Party Link, up to 100 speakers), which the Soundcore Boom 3i cannot. It plays in stereo from a single unit, unlike the Soundcore Boom 3i. The tradeoff: There is no companion app or 3.5 mm input.
Buy the Soundcore Boom 3i. It is rated higher for sound quality, and the $19 you would save on the Teufel Rockster Go 2 does not close the gap.
Want more options? Browse the full Portable Bluetooth rankings.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Soundcore Boom 3i | Teufel Rockster Go 2 | |
|---|---|---|
| Price | $118.99 | $99.99 |
| Ranked | #31 of 179 in Medium Size Portable Bluetooth Speakers | #93 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (Teufel Go) |
| Aux Input | No | No |
| Bass Extension (-10dB) | 56Hz | - |
| Battery Life | 16 hours (Manufacturer specified) | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| EQ | Yes | Yes |
| IP Rating | IP68 | IP67 |
| Party Mode | No | Yes (Party Link, up to 100 speakers) |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | - |
| Dimensions | 8.3” x 3.3” x 3.1” (210 x 85 x 78.5 mm) | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Drivers | 94mm woofer + tweeter | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| Weight | 1.7 lbs (783 g) | 1.6 lbs (735 g) |
| Amplifier Power | 50W | 8W |
| Bluetooth Codecs | SBC, AAC | SBC, AAC |
| Built-in Microphone | Yes | No |
| Digital Aux Input | No | Yes (USB-C sound card) |
| Lights | Yes | - |
| Strap | Yes (detachable strap) | Yes (detachable strap) |
| Power Bank | - | No |
| USB Playback | - | No |
| Frequency Response | - | 60Hz - 20kHz (Manufacturer specified) |
| Charging Time | - | 2.5 hours (Manufacturer specified) |
Related Speaker Comparisons
How Soundcore Boom 3i compares with other leading options: