Short answer: the Sony ULT Field 5, if you are buying new. The Vifa Helsinki ranks higher than it (#1 vs #56 of 115 large speakers, 4.8/5 vs 3.5/5) but is discontinued, so only consider it used; the Sony ULT Field 5 is still sold new at $268.
The Sony ULT Field 5 is the longer-running, tougher pick. A tough, waterproof party speaker with loud, bass focused output, an aux input, a power bank and a long battery. It is rated for 25 hours of battery against 8 for the Vifa Helsinki. It is rated IP67, while the Vifa Helsinki has no water resistance. It supports LDAC Bluetooth, which the Vifa Helsinki lacks. Watch for: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth.
The Vifa Helsinki is the better-sounding, lighter pick. A superb sounding battery powered speaker, with exceptionally clean mids and treble, now discontinued but worth buying used. At 3.1 lbs (1.4 kg) it weighs much less than the Sony ULT Field 5 at 7.3 lbs (3.3 kg). The tradeoff: No TWS pairing, looks like a purse, requires a hacked Vifa app (Android only post #48) to enable night mode to sound good.
Buy the Sony ULT Field 5 if you want one new; the Vifa Helsinki is discontinued, so only look for it used.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A tough, waterproof party speaker with loud, bass focused output, an aux input, a power bank and a long battery.
A superb sounding battery powered speaker, with exceptionally clean mids and treble, now discontinued but worth buying used.
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Specifications Side By Side
| Sony ULT Field 5 | Vifa Helsinki | |
|---|---|---|
| Price | $268.00 | $449.00 Discontinued |
| Ranked | #56 of 115 in Large Size Portable Bluetooth Speakers | #1 of 115 in Large Size Portable Bluetooth Speakers |
| App | Yes | No (official app is broken, 3rd party android app only) |
| Aux Input | Yes | Yes |
| Battery Life | 25 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | aptX, SBC |
| Bluetooth Version | 5.3 | 4.1 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) | 6.1” x 8.3” x 2.8” (156 x 210 x 70 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer | 2x 50mm fullrange, 2x 66mm woofers + 2x passive radiators |
| EQ | Yes (App + ULT button) | No |
| IP Rating | IP67 | None |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | AC Power brick |
| Stereo | Yes | Partially (shared woofer) |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Weight | 7.3 lbs (3.3 kg) | 3.1 lbs (1.4 kg) |
| Amplifier Power | 27W | 50W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (built-in strap) |
| Bass Extension (-10dB) | - | 48Hz |
| Frequency Response | - | 58Hz - 18kHz (Manufacturer specified) |
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