Short answer: the Bogasing M5. It ranks #55 of 142 medium speakers by sound quality at $45.59; the Sony ULT Field 1 ranks #79 and costs $98, which makes this an easy call rather than a real tradeoff.
What the Sony ULT Field 1 offers: 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. Watch for: Upper midrange peak, rolled off treble
What the Bogasing M5 offers: Compact enough for a backpack side pocket at under 1.7 lb. Up to 30 hours of battery life. USB-C charging - no proprietary cable to lose. Watch for: Front/rear driver configuration. Use bass mode for the flattest response. Sounds thin in the midrange. Hot treble and rolled off bass in default mode. Treble a bit rolled off in bass mode.
Buy the Bogasing M5. It ranks higher for sound quality than the Sony ULT Field 1 and costs less, which settles it without a real tradeoff to make.
There is a real battery-life gap here: the Bogasing M5 is rated for 30 hours, the Sony ULT Field 1 only 12 hours.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 1 | Bogasing M5 | |
|---|---|---|
| Price | $98.00 | $45.59 |
| Ranked | #79 of 142 in Medium Size Portable Bluetooth Speakers | #55 of 142 in Medium Size Portable Bluetooth Speakers |
| App | Yes | - |
| Aux Input | No | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | Yes | - |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | No | Yes (USB-A) |
| Power Input | USB-C | - |
| Stereo | No | No (front/rear drivers) |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.4 lbs (650 g) | 1.7 lbs (757 g) |
| Bluetooth Codecs | AAC, SBC | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 8.1" x 3" x 3" (206 x 77 x 76 mm) | 6.3" x 3" x 2.8" (160 x 76 x 71 mm) |
| Drivers | 83mm x 42mm woofer, 16mm tweeter + passive radiator | 30W system |
| Digital Aux Input | No | No |
| Bass Extension (-10dB) | - | 61Hz |
| Maximum SPL | - | 96dB (measured by Alan Ross Reviews) |
| MicroSD Playback | - | Yes |
| USB Playback | - | Yes |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 40W |
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Prices on this page were last checked September 16, 2026 at 12:41 AM 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: $98.00 Amazon eBay
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 |
| TWS | Yes |
| Weight | 1.4 lbs (650 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Bogasing M5: $45.59 Amazon eBay
Pros: Compact enough for a backpack side pocket at under 1.7 lb. Up to 30 hours of battery life. USB-C charging - no proprietary cable to lose. Measured bass extension of 61Hz (-10dB).
Cons: Front/rear driver configuration. Use bass mode for the flattest response. Sounds thin in the midrange. Hot treble and rolled off bass in default mode. Treble a bit rolled off in bass mode.
Full Bogasing M5 review and specifications →
| Amplifier Power | 40W |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 61Hz |
| Battery Life | 30 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 6.3" x 3" x 2.8" (160 x 76 x 71 mm) |
| Drivers | 30W system |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| MicroSD Playback | Yes |
| Omnidirectional | Yes |
| Power Bank | Yes (USB-A) |
| Stereo | No (front/rear drivers) |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 1.7 lbs (757 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons