Short answer: the Tronsmart T8. It ranks #54 of 182 medium speakers by sound quality, rated 3.6/5, at $49.99; the Sony ULT Field 3 ranks #71, rated 3.4/5, and costs $208, which makes this an easy call rather than a real tradeoff.
The Tronsmart T8 is the lighter choice. An affordable waterproof speaker with upward firing drivers that spread sound around, plus lights, app EQ, an aux input and stereo pairing. At 1.8 lbs (800 g) it weighs noticeably less than the Sony ULT Field 3 at 2.6 lbs (1.2 kg). It keeps a wired aux input, which the Sony ULT Field 3 lacks. The catch: Against the Xiaomi Sound Outdoor, listeners in Mateusz Cholewa’s comparison found the T8 harsh and tiring, and Techder Audios’ test showed the Xiaomi Sound Party with deeper, heavier bass.
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 18 for the Tronsmart T8. The catch: Sounds a bit hollow, a bit boosted in the treble.
Buy the Tronsmart T8. It is rated higher for sound quality than the Sony ULT Field 3 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 14, 2026 at 6:17 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
| Tronsmart T8 | Sony ULT Field 3 | |
|---|---|---|
| Price | $49.99 | $208.00 |
| Ranked | #54 of 182 in Medium Size Portable Bluetooth Speakers | #71 of 182 in Medium Size Portable Bluetooth Speakers |
| Stereo | Partially | Yes |
| Amplifier Power | 40W | 27W |
| App | Yes (Tronsmart) | Yes |
| Aux Input | Yes | No |
| Battery Life | 18 hours at 50% volume, lights off (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.2 |
| Charging Time | 4.5 hours | - |
| Dimensions | 8.6”H x 3.2”W x 3.2”D (218 x 82 x 82 mm) | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) |
| Drivers | 2x upward firing full-range drivers + 1x woofer + 2x passive radiators | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| EQ | Yes (app) | Yes (App + ULT button) |
| Frequency Response | 56Hz - 20kHz (Manufacturer specified) | - |
| IP Rating | IPX7 | IP67 |
| Lights | Yes | - |
| MicroSD Playback | Yes | - |
| Omnidirectional | Pointing up | No |
| Power Input | USB-C | USB-C |
| Strap | Yes (lanyard) | Yes (detachable shoulder strap) |
| TWS | Yes | Yes |
| Weight | 1.8 lbs (0.80 kg) | 2.6 lbs (1.2 kg) |
| Bluetooth Codecs | - | SBC, AAC, LDAC |
| Built-in Microphone | - | Yes |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Bank | - | Yes (USB-C, 5V/1.5A) |
| Digital Aux Input | - | No |
Where the Ratings Come From
- Tronsmart T8: reviews by Mateusz Cholewa, Techder Audios and Jagist.
- Sony ULT Field 3: reviews by GYMCADDY and Mark Ellis.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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