Short answer: the Sony ULT Field 1. It ranks #90 of 157 medium speakers by sound quality (rated 3.1/5); the Boat Stone 350 ranks #135 (rated 2.3/5).
The Sony ULT Field 1 is the better-sounding, longer-running pick. IP67 rated, survives drops and 1m submersion. It is rated for 12 hours of battery against 6 for the Boat Stone 350. Watch for: Upper midrange peak, rolled off treble.
The Boat Stone 350 is the lighter choice. 10W cylindrical stereo speaker with dual passive radiators, IPX7 water resistance, microSD card slot, and 3.5mm aux input. At 0.9 lbs (426 g) it weighs noticeably less than the Sony ULT Field 1 at 1.4 lbs (650 g). It keeps a wired aux input, which the Sony ULT Field 1 lacks. It plays in stereo from a single unit, unlike the Sony ULT Field 1. Watch for: Midrange peaks with rolled-off treble.
Buy the Sony ULT Field 1. It is rated higher for sound quality than the Boat Stone 350.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 1 | Boat Stone 350 | |
|---|---|---|
| Price | $138.00 | - |
| Ranked | #90 of 157 in Medium Size Portable Bluetooth Speakers | #135 of 157 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 6 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes (multiple modes) |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 0.9 lbs (426 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | AAC, SBC | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 8.1” x 3” x 3” (206 x 77 x 76 mm) | 3.5” x 7.1” (90 x 180 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 2x 20mm tweeters + 2x 45mm drivers |
| Digital Aux Input | No | No |
| Strap | Yes (detachable strap) | No |
| Bass Extension (-10dB) | - | 87Hz |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 10W |
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Prices on this page were last checked October 2, 2026 at 10:18 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 1: $138.00 Amazon eBay
Older models: the Sony XB23 (ranked higher, rated 3.3/5) and the Sony SRS-XB20 (ranked lower, 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 | Yes |
| 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
- Sony ULT Field 1 vs JBL Grip
- Sony ULT Field 1 vs Treblab HD77
- Sony ULT Field 1 vs Tribit Xsound Go
- Sony ULT Field 1 vs Tronsmart Mirtune S100
- Sony ULT Field 1 vs KEF Muo gen2
- Sony ULT Field 1 vs Tronsmart Mirtune C3
- Sony ULT Field 1 vs Tribit Xsound Surf
- Sony ULT Field 1 vs Sonos Roam
- See all 133 comparisons
Boat Stone 350 eBay
Pros: 10W cylindrical stereo speaker with dual passive radiators, IPX7 water resistance, microSD card slot, and 3.5mm aux input. Measured bass extension of 87Hz (-10dB).
Cons: Midrange peaks with rolled-off treble. Bass extension limited below 87Hz.
Full Boat Stone 350 review and specifications →
| Amplifier Power | 10W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 87Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 3.5” x 7.1” (90 x 180 mm) |
| Drivers | 2x 20mm tweeters + 2x 45mm drivers |
| EQ | Yes (multiple modes) |
| IP Rating | IPX7 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 0.9 lbs (426 g) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
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