Short answer: the Sony ULT Field 3 on measured sound quality, the Tronsmart Mirtune S100 on price. The Sony ULT Field 3 ranks #71 of 179 medium speakers, rated 3.4/5, at $208. The Tronsmart Mirtune S100 ranks #97, rated 3.1/5, at $79.99, $128.01 cheaper.
The case for the Sony ULT Field 3: A rugged waterproof stereo speaker with long battery life, a detailed app EQ, a shoulder strap and a phone charging port. It supports LDAC Bluetooth, which the Tronsmart Mirtune S100 lacks. Watch for: Sounds a bit hollow, a bit boosted in the treble.
What the Tronsmart Mirtune S100 does well: A waterproof speaker with long battery life for outdoor and casual listening. It keeps a wired aux input, which the Sony ULT Field 3 lacks.
Buy the Sony ULT Field 3 when sound quality outweighs the price for you, and the Tronsmart Mirtune S100 when the price outweighs sound quality instead.
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
| Sony ULT Field 3 | Tronsmart Mirtune S100 | |
|---|---|---|
| Price | $208.00 | $79.99 |
| Ranked | #71 of 179 in Medium Size Portable Bluetooth Speakers | #97 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| Bluetooth Version | 5.2 | 5.3 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) | 9.1” x 3.5” x 3.9” (231 x 88 x 100 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer | 20W drivers |
| EQ | Yes (App + ULT button) | Yes |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | Yes (USB-C, 5V/1.5A) | - |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Partially |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 2.6 lbs (1.2 kg) | 3 lbs (1.36 kg) |
| Amplifier Power | 27W | 50W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | - |
| Bass Extension (-10dB) | - | ~64Hz |
| Wi-Fi | - | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
Related Speaker Comparisons
How Sony ULT Field 3 compares with other leading options: