Short answer: the Sony ULT Field 3. It ranks #61 of 144 medium speakers by sound quality, rated 3.4/5, at $138. The Tronsmart Mirtune S100 ranks #79, rated 3.1/5, at $79.99, $58.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
The case for the Sony ULT Field 3: IP67 rated, dustproof and water resistant. Watch for: Sounds a bit hollow, a bit boosted in the treble.
What the Tronsmart Mirtune S100 does well: At 1.36 kg, Tronsmart Mirtune S100 combines 20W drivers with Bluetooth. The tradeoff: Bass is limited by its ~64Hz specification.
Buy the Sony ULT Field 3. It is rated higher for sound quality, and the $58.01 saving on the Tronsmart Mirtune S100 is not enough to make up the difference.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 3 | Tronsmart Mirtune S100 | |
|---|---|---|
| Price | $138.00 | $79.99 |
| Ranked | #61 of 144 in Medium Size Portable Bluetooth Speakers | #79 of 144 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| 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:
- Sony ULT Field 3 vs Earfun Uboom L
- Soundcore Motion 300 vs Sony ULT Field 3
- Soundcore Motion+ vs Sony ULT Field 3
- Soundcore Boost “upgraded” 2021 vs Sony ULT Field 3
- Sony ULT Field 3 vs Minirig 4
Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Sony ULT Field 3: $138.00 Amazon eBay
Older models: the Sony XB33 (rated 3.4/5), the Sony SRS-XE300 (rated 2.8/5) and the Sony SRS-XB30 (rated 2.6/5).
Pros: IP67 rated, dustproof and water resistant. 24 hour battery life. App with 10-band EQ. Party Connect with up to 100 speakers. USB-C in/out for charging your phone.
Cons: Sounds a bit hollow, a bit boosted in the treble. Custom EQ and the ULT bass-boost button can’t be used together - turning on ULT disables the EQ. Bass is very weak with ULT off. Lost to the JBL Charge 6 in a side-by-side comparison despite being the larger speaker.
Full Sony ULT Field 3 review and specifications →
| Amplifier Power | 27W |
|---|---|
| App | Yes |
| Aux Input | No |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.1” x 4.4” x 3.1” (256 x 113 x 79 mm) |
| Drivers | 1x 20mm tweeter + 1x 86mm x 46mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C, 5V/1.5A) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 2.6 lbs (1.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- Sony ULT Field 3 vs Soundcore 3/Soundcore Select 2
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- Sony ULT Field 3 vs Beats Pill 2024
- Sony ULT Field 3 vs JBL Flip 5
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Tronsmart Mirtune S100: $79.99 Tronsmart eBay
Pros: At 1.36 kg, Tronsmart Mirtune S100 combines 20W drivers with Bluetooth. Claimed 20 hours (manufacturer specified) battery life, ipx7 protection and limited-stereo playback make its feature set practical for its intended room or portable use. Measured bass extension of ~64Hz (-10dB).
Cons: Bass is limited by its ~64Hz specification. There is no companion app. No EQ adjustment.
Full Tronsmart Mirtune S100 review and specifications →
| Amplifier Power | 50W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~64Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 9.1” x 3.5” x 3.9” (231 x 88 x 100 mm) |
| Drivers | 20W drivers |
| EQ | Yes |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Partially |
| TWS | Yes |
| Weight | 3 lbs (1.36 kg) |
| Wi-Fi | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Tronsmart Mirtune S100 vs JBL Grip
- Tronsmart Mirtune S100 vs Sony ULT Field 1
- Tronsmart Mirtune S100 vs Tribit Stormbox 2
- Tronsmart Mirtune S100 vs Klipsch Nashville
- Tronsmart Mirtune S100 vs Ultimate Ears Wonderboom 4
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