Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Sony ULT Field 7 ranks #39 of 70 boombox speakers at $400; the Vifa Helsinki ranks #1 of 75 large speakers at $400.
What the Sony ULT Field 7 gets right: Better sounding than the XG500. The tradeoff: Still not as deep bass as the top ranked speakers.
On the Vifa Helsinki side: Generally regarded as the best midrange and treble sound quality of any battery powered Bluetooth speaker. 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 7 at $400 if you want a boombox speaker. Buy the Vifa Helsinki at $400 if you want a large speaker instead.
Specifications Side By Side
| Sony ULT Field 7 | Vifa Helsinki | |
|---|---|---|
| Price | $400 | $400 |
| Ranked | #39 of 70 in Boombox Size Portable Bluetooth Speakers | #1 of 75 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 | - |
| Party Mode | Yes (Party Connect up to 100 speakers) | No |
| Power Bank | Yes | No |
| Power Input | AC Power cord | AC Power brick |
| Stereo | Yes | Partially (shared woofer) |
| USB Playback | Yes | - |
| Weight | 13.9 lbs / 6.3 kg | 3.1 lbs / 1.4 kg |
| 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 | 20.16" x 8.82" x 8.74" (512 x 224 x 222 mm) | 6.1" x 8.3" x 2.8" (156 x 210 x 70 mm) |
| Output Power | 100W | Specs not published by manufacturer |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9") tweeters | 2x 50mm fullrange, 2x 66mm woofers + 2x passive radiators |
| Frequency Response | - | 58Hz - 18kHz (Manufacturer specified) |
The Two Speakers In Full
Sony ULT Field 7: $400 Amazon
Pros: Better sounding than the XG500
Cons: Still not as deep bass as the top ranked speakers. 8khz peak
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | ~52Hz |
| Battery Life | 30 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Dimensions | 20.16" x 8.82" x 8.74" (512 x 224 x 222 mm) |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9") tweeters |
| EQ | Yes (App + ULT button) |
| Guitar Input | Yes |
| IP Rating | IP67 |
| Microphone Input | Yes |
| Output Power | 100W |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes |
| Power Input | AC Power cord |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 13.9 lbs / 6.3 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
Vifa Helsinki: $400 Amazon
Pros: Generally regarded as the best midrange and treble sound quality of any battery powered Bluetooth speaker.
Cons: No TWS pairing, looks like a purse, requires a hacked Vifa app (Android only post #48) to enable night mode to sound good. Not sure I can recommend this one generally these days, the Uboom L has 98% of the sound quality with more features and a way cheaper price. There are mentions that the 2022 “new” version of this speaker doesn’t sound as good as Vifa was purchased by a Chinese company and laid off all the great sound engineers in the Austria office.
| App | No (official app is broken, 3rd party android app only) |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 48Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX, SBC |
| Bluetooth Version | 4.1 |
| Built in Microphone | Yes |
| Dimensions | 6.1" x 8.3" x 2.8" (156 x 210 x 70 mm) |
| Drivers | 2x 50mm fullrange, 2x 66mm woofers + 2x passive radiators |
| EQ | No |
| Frequency Response | 58Hz - 18kHz (Manufacturer specified) |
| IP Rating | None |
| Output Power | Specs not published by manufacturer |
| Party Mode | No |
| Power Bank | No |
| Power Input | AC Power brick |
| Stereo | Partially (shared woofer) |
| TWS | No |
| Weight | 3.1 lbs / 1.4 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.