Short answer: the Tronsmart Mirtune S100. Both are rated 3.1/5 for sound quality (#79 and #81 of 144 medium speakers), and the Tronsmart Mirtune S100 costs $79.99 against $98 for the Sony ULT Field 1, and with sound quality even, the cheaper one is the better buy.
Why pick the Tronsmart Mirtune S100: At 1.36 kg, Tronsmart Mirtune S100 combines 20W drivers with Bluetooth. The catch: Bass is limited by its ~64Hz specification.
Why pick the Sony ULT Field 1: IP67 rated, survives drops and 1m submersion. Watch for: Upper midrange peak, rolled off treble.
Buy the Tronsmart Mirtune S100. Both are rated the same for sound quality, and it costs $18.01 less than the Sony ULT Field 1.
Battery life favors the Tronsmart Mirtune S100: rated for 20 hours against 12 hours for the Sony ULT Field 1.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Tronsmart Mirtune S100 | Sony ULT Field 1 | |
|---|---|---|
| Price | $79.99 | $98.00 |
| Ranked | #79 of 144 in Medium Size Portable Bluetooth Speakers | #81 of 144 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | ~64Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| IP Rating | IPX7 | IP67 |
| Stereo | Partially | No |
| Omnidirectional | No | No |
| Weight | 3 lbs (1.36 kg) | 1.4 lbs (650 g) |
| Wi-Fi | No | - |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 9.1” x 3.5” x 3.9” (231 x 88 x 100 mm) | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 50W | - |
| Drivers | 20W drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | AAC, SBC |
| App | Yes | Yes |
| Aux Input | Yes | No |
| EQ | Yes | Yes |
| TWS | Yes | Yes |
| Power Input | USB-C | USB-C |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Bank | - | No |
| Strap | - | Yes (detachable strap) |
Related Speaker Comparisons
How Tronsmart Mirtune S100 compares with other leading options:
- Earfun Uboom L vs Tronsmart Mirtune S100
- JBL Charge 6 vs Tronsmart Mirtune S100
- JBL Flip 7 vs Tronsmart Mirtune S100
- JBL Charge 5 vs Tronsmart Mirtune S100
- Soundcore Boom 3i vs Tronsmart Mirtune S100
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
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
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Sony ULT Field 1: $98.00 Amazon eBay
Older models: the Sony XB23 (rated 3.3/5) and the Sony SRS-XB20 (rated 2.8/5).
Pros: IP67 rated, survives drops and 1m submersion. Real-world battery around 28+ hours with ULT (bass boost) mode off. Stereo-pairs with a second ULT Field 1.
Cons: Upper midrange peak, rolled off treble
Full Sony ULT Field 1 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | AAC, SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 8.1” x 3” x 3” (206 x 77 x 76 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator |
| EQ | Yes |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (detachable strap) |
| TWS | Yes |
| Weight | 1.4 lbs (650 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons