Short answer: the Vifa Helsinki for midrange and treble, the Sony ULT Field 7 for everything else. The Vifa is generally regarded as having the best midrange and treble of any battery powered Bluetooth speaker, but it has no TWS pairing and needs a hacked Vifa app to enable night mode to sound good. The Sony is called better sounding than the XG500, though its bass is still not as deep as the top ranked speakers.
Buy the Sony ULT Field 7 at $448 for a boombox speaker, or the Vifa Helsinki at $449 for a large speaker instead.
If battery life is a priority, the Sony ULT Field 7 is rated for 30 hours versus 8 hours for the Vifa Helsinki.
If water resistance matters to you, the Sony ULT Field 7 at IP67 (brief submersion) holds up far better than the Vifa Helsinki at no water resistance.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Sony ULT Field 7 | Vifa Helsinki | |
|---|---|---|
| Price | $448.00 | $449.00 Discontinued |
| Ranked | #61 of 113 in Boombox Size Portable Bluetooth Speakers | #1 of 120 in Large Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~52Hz | 48Hz |
| Battery Life | 30 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Guitar Input | Yes | - |
| IP Rating | IP67 | None |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes (USB-A, 5V/1.5A) | No |
| Power Input | AC Power cord | AC Power brick |
| Stereo | Yes | Partially (shared woofer) |
| Omnidirectional | No | No |
| USB Playback | Yes | - |
| Weight | 13.9 lbs (6.3 kg) | 3.1 lbs (1.4 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | aptX, SBC |
| App | No | No (official app is broken, 3rd party android app only) |
| EQ | Yes (App + ULT button) | No |
| TWS | Yes | No |
| Built-in Microphone | Yes | Yes |
| Bluetooth Version | 5.2 | 4.1 |
| Dimensions | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) | 6.1” x 8.3” x 2.8” (156 x 210 x 70 mm) |
| Amplifier Power | 100W | 50W |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters | 2x 50mm fullrange, 2x 66mm woofers + 2x passive radiators |
| Digital Aux Input | No | No |
| Strap | No | Yes (built-in strap) |
| Frequency Response | - | 58Hz - 18kHz (Manufacturer specified) |
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