Short answer: the Vifa Oslo. It ranks #8 of 85 large speakers by sound quality, rated 4.5/5, at $549. The Sony ULT Field 5 ranks #46, rated 3.5/5, at $348, $201 cheaper, which does not close the gap in sound quality.
The case for the Vifa Oslo: Extreme treble details with decent bass. The tradeoff: Dip at 270Hz.
What the Sony ULT Field 5 does well: A tough 3.3kg portable with IP67 protection, LDAC/AAC support, aux input, a 10-band app EQ, Party Connect, USB-C power-bank output and a claimed 25-hour battery. The catch: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth.
Buy the Vifa Oslo. It is rated higher for sound quality, and saving $201 with the Sony ULT Field 5 does not make up for the sound-quality gap.
There is a real gap in water resistance: the Sony ULT Field 5 at IP67 (brief submersion) against the Vifa Oslo, which has no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Vifa Oslo | Sony ULT Field 5 | |
|---|---|---|
| Price | $549.00 | $348.00 |
| Ranked | #8 of 85 in Large Size Portable Bluetooth Speakers | #46 of 85 in Large Size Portable Bluetooth Speakers |
| App | No (official app is broken, 3rd party android app only) | Yes |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 50Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | aptX, SBC | SBC, AAC, LDAC |
| IP Rating | None | IP67 |
| Power Input | AC Power brick | USB-C |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| TWS | No | Yes |
| Weight | 5.3 lbs (2.4 kg) | 7.3 lbs (3.3 kg) |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes (App + ULT button) |
| Party Mode | No | Yes (Party Connect up to 100 speakers) |
| Power Bank | No | Yes (USB-C) |
| Bluetooth Version | 4.1 | 5.3 |
| Dimensions | 10.6” x 7.1” x 3.5” (268 x 181 x 90 mm) | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Drivers | 2x 50mm fullrange, 2x 80mm woofers + passive radiators | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| Frequency Response | 55Hz - 20kHz (Manufacturer specified) | - |
| Digital Aux Input | No | No |
| Amplifier Power | 50W | 27W |
| Strap | - | Yes (detachable shoulder strap) |
Related Speaker Comparisons
More top alternatives to Vifa Oslo:
- Vifa Helsinki vs Vifa Oslo
- JBL Xtreme 5 vs Vifa Oslo
- Tribit Stormbox Lava vs Vifa Oslo
- Brane X vs Vifa Oslo
- Minirig 3 with subwoofer vs Vifa Oslo
Prices on this page were last checked September 30, 2026 at 2:57 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Vifa Oslo: $549.00 Amazon eBay
Pros: Extreme treble details with decent bass. Full, natural, accurate sound at higher volumes. Rich, full bass from opposing 65mm woofers. Premium Kvadrat wool fabric with aluminum handle. 10 hour battery life. Measured bass extension of 50Hz (-10dB).
Cons: Dip at 270Hz. The Vifa Helsinki is cheaper and generally has a more neutral frequency response, so it is the better buy if you specifically want a Vifa. This one is hard to recommend generally these days: the Uboom L has 95% of the sound quality with more features and a much cheaper price.
Full Vifa Oslo review and specifications →
| Amplifier Power | 50W |
|---|---|
| App | No (official app is broken, 3rd party android app only) |
| Aux Input | Yes |
| Bass Extension (-10dB) | 50Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | aptX, SBC |
| Bluetooth Version | 4.1 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.6” x 7.1” x 3.5” (268 x 181 x 90 mm) |
| Drivers | 2x 50mm fullrange, 2x 80mm woofers + passive radiators |
| EQ | No |
| Frequency Response | 55Hz - 20kHz (Manufacturer specified) |
| IP Rating | None |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | AC Power brick |
| Stereo | Partially (1 woofer) |
| TWS | No |
| Weight | 5.3 lbs (2.4 kg) |
- 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.
- Head-to-Head Comparisons
Sony ULT Field 5: $348.00 Amazon eBay
Older models: the Sony SRS-XB43 (ranked lower, rated 3.5/5) and the Sony SRS-XG300 (ranked lower, rated 3.1/5).
Pros: A tough 3.3kg portable with IP67 protection, LDAC/AAC support, aux input, a 10-band app EQ, Party Connect, USB-C power-bank output and a claimed 25-hour battery. Reviews find it energetic and dynamic with substantial bass, enough volume for a yard, and two ULT modes that let bass-focused listeners choose a deeper or punchier presentation.
Cons: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth. Deep bass is less authoritative than the enclosure suggests, and the loud confirmation tone when pressing the ULT button is an unnecessary annoyance. Use the app EQ and audition it before buying for detail-focused music.
Full Sony ULT Field 5 review and specifications →
| Amplifier Power | 27W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Danny Pops: Don’t TOUCH that ULT Button! Sony ULT Field 5 Review More from DannyPops →
- Mark Ellis Reviews: Sony just changed summer sound 🤨 | Sony ULT Field 5 & 3 Review
- Dominik Reviews: Sony ULT Field 5 vs JBL Xtreme 4 - Outdoor Sound Test - Sony shines or not? More from Dominik Reviews →
- Joy & Oluv’Sone: Sony ULT Field 5 vs Anker SoundCore Boom 2 - listening test More from Oluv’Sone →
- Mateusz Cholewa: SONY ULT Field 5 vs BOGASING S8 PRO MAX More from Mateusz Cholewa →
- Head-to-Head Comparisons