Short answer: the Teufel Rockster Go 2. It ranks #93 of 179 medium speakers by sound quality, rated 3.2/5, at $99.99; the Sony ULT Field 1 ranks #99, rated 3.1/5, and costs $138, which makes this an easy call rather than a real tradeoff.
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 plays in stereo from a single unit, unlike the Sony ULT Field 1. The catch: There is no companion app or 3.5 mm input.
What the Sony ULT Field 1 does well: A tough, waterproof small speaker that survives drops, with long real world battery life and stereo pairing. The catch: Upper midrange peak, rolled off treble.
Buy the Teufel Rockster Go 2. It is rated higher for sound quality than the Sony ULT Field 1 and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 11, 2026 at 3:26 AM 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
| Teufel Rockster Go 2 | Sony ULT Field 1 | |
|---|---|---|
| Price | $99.99 | $138.00 |
| Ranked | #93 of 179 in Medium Size Portable Bluetooth Speakers | #99 of 179 in Medium Size Portable Bluetooth Speakers |
| Aux Input | No | No |
| Battery Life | 15 hours, 28 with Eco Mode (Manufacturer specified) | 12 hours (Manufacturer specified) |
| IP Rating | IP67 | IP67 |
| Weight | 1.6 lbs (735 g) | 1.4 lbs (650 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | AAC, SBC |
| Dimensions | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Drivers | 2x 50mm wide-band drivers + 1x 64mm passive radiator | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| TWS | Yes | Yes |
| Party Mode | Yes (Party Link, up to 100 speakers) | Yes (Party Connect up to 100 speakers) |
| Built-in Microphone | No | Yes |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| Digital Aux Input | Yes (USB-C sound card) | No |
| App | Yes (Teufel Go) | Yes |
| EQ | Yes | Yes |
| Power Input | USB-C | USB-C |
| Power Bank | No | No |
| USB Playback | No | - |
| Amplifier Power | 8W | - |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Charging Time | 2.5 hours (Manufacturer specified) | - |
| Strap | Yes (detachable strap) | Yes (detachable strap) |
| Bluetooth Version | - | 5.3 |
Watch Them Compared
Videos and reviews that test both speakers side by side.
Related Speaker Comparisons
More worthwhile head-to-heads for Teufel Rockster Go 2: