Short answer: the Sony ULT Field 3 if sound quality matters most, the Teufel Rockster Go 2 if price matters most. The Sony ULT Field 3 ranks #71 of 179 medium speakers, rated 3.4/5, at $208. The Teufel Rockster Go 2 ranks #93, rated 3.2/5, at $99.99, $108.01 cheaper.
The Sony ULT Field 3 is the longer-running choice. A rugged waterproof stereo speaker with long battery life, a detailed app EQ, a shoulder strap and a phone charging port. It is rated for 24 hours of battery against 15 for the Teufel Rockster Go 2. It supports LDAC Bluetooth, which the Teufel Rockster Go 2 lacks. The catch: Sounds a bit hollow, a bit boosted in the treble.
The Teufel Rockster Go 2 is the lighter pick. A light, rugged waterproof speaker with very long battery life in eco mode, stereo pairing and a tripod mount. At 1.6 lbs (735 g) it weighs much less than the Sony ULT Field 3 at 2.6 lbs (1.2 kg). Watch for: There is no companion app or 3.5 mm input.
Buy the Sony ULT Field 3 if sound quality matters more than the price. Buy the Teufel Rockster Go 2 if the price matters more than sound quality.
Looking for alternatives? See the complete 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.
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Specifications Side By Side
| Sony ULT Field 3 | Teufel Rockster Go 2 | |
|---|---|---|
| Price | $208.00 | $99.99 |
| Ranked | #71 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 |
| Battery Life | 24 hours (Manufacturer specified) | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC, AAC |
| Bluetooth Version | 5.2 | - |
| Built-in Microphone | Yes | No |
| Dimensions | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| EQ | Yes (App + ULT button) | Yes |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Party Connect up to 100 speakers) | Yes (Party Link, up to 100 speakers) |
| Power Bank | Yes (USB-C, 5V/1.5A) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 2.6 lbs (1.2 kg) | 1.6 lbs (735 g) |
| Amplifier Power | 27W | 8W |
| Digital Aux Input | No | Yes (USB-C sound card) |
| Strap | Yes (detachable shoulder strap) | Yes (detachable strap) |
| USB Playback | - | No |
| Frequency Response | - | 60Hz - 20kHz (Manufacturer specified) |
| Charging Time | - | 2.5 hours (Manufacturer specified) |
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