Short answer: neither the Sony ULT Field 5 nor the Ultimate Ears Epicboom is a clean winner on sound, so choose by use case. Sony brings an IP67 enclosure and a more purpose-built outdoor feature set, while the Epicboom offers USB-C charging and a rated 17-hour battery.
Both speakers give away low-bass depth for their size. The Sony’s overall tuning is only middling, while the Epicboom also stops short in the bottom octave. That makes durability, charging convenience, and the sound signature you prefer more important than a headline rank alone.
What the Sony ULT Field 5 gets right: IP67 rated, dustproof and water resistant. Set against that: Bass not as deep as others in the category, and sound quality overall is just okay.
Buy the Sony ULT Field 5 if you need the dustproof, waterproof speaker for outdoor use.
Buy the Ultimate Ears Epicboom if USB-C charging and its longer stated runtime better suit your routine.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| Sony ULT Field 5 | Ultimate Ears Epicboom | |
|---|---|---|
| Price | $348.00 | $228.59 |
| Ranked | #59 of 120 in Large Size Portable Bluetooth Speakers | #89 of 120 in Large Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Life | 25 hours (Manufacturer specified) | 17 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC |
| Bluetooth Version | 5.3 | 5.2 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) | 4.7” x 9.5” x 6.4” (119 x 241 x 162 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer | 1x 120mm woofer, 2x 45mm tweeters |
| EQ | Yes (App + ULT button) | No |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | 4.3 lbs (1.97 kg) |
| Amplifier Power | 27W | 10W RMS |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (built-in loop) |
| Bass Extension (-10dB) | - | ~55Hz |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Maximum SPL | - | 94dB (Manufacturer specified) |
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