Short answer: the Boombox 3, and the price difference is a single dollar. It ranks #27 of 112 boombox speakers at $349.95; the ULT Field 7 ranks #61 at $448.
Sony’s own comparison point undersells the gap. The ULT Field 7’s pros only claim it sounds better than its own predecessor, the XG500, without addressing how it stacks up against the rest of the class. Its cons are direct: still not as deep bass as the top-ranked speakers, plus a peak at 8kHz.
The Boombox 3 wins on battery too. Sony rates 30 hours against JBL’s own 24, so that’s one real edge for the ULT Field 7, alongside the same IP67 rating both share.
Buy the Boombox 3 for the higher ranking at essentially the same price. Buy the ULT Field 7 if the extra battery life specifically matters more to you than the ranking gap.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A loud, fully waterproof boombox with a dedicated subwoofer, a 24 hour battery and power bank charging.
A waterproof stereo party speaker with a 30 hour battery and karaoke mic and guitar inputs.
Prices on this page were last checked November 5, 2026 at 10:30 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
| JBL Boombox 3 | Sony ULT Field 7 | |
|---|---|---|
| Price | $349.95 | $448.00 |
| Ranked | #27 of 112 in Boombox Size Portable Bluetooth Speakers | #61 of 112 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Aux Latency | 25ms | - |
| Bass Extension (-10dB) | 43Hz | ~52Hz |
| Battery Life | 24 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| IP Rating | IP67 | IP67 |
| Bluetooth Latency | 100ms | - |
| Maximum SPL | 110dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (PartyBoost up to 100 speakers) | Yes (Party Connect up to 100 speakers) |
| Power Input | AC Power cable | AC Power cord |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 14.8 lbs (6.7 kg) | 13.9 lbs (6.3 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, LDAC |
| App | No | No |
| EQ | No | Yes (App + ULT button) |
| Power Bank | Yes (USB-A) | Yes (USB-A, 5V/1.5A) |
| USB Playback | No | Yes |
| Built-in Microphone | No | Yes |
| FM Tuner | No | - |
| Microphone Input | No | Yes (Karaoke mode with echo effect) |
| MicroSD Playback | No | - |
| Amplifier Power | 180W AC / 136W battery | 100W |
| Dimensions | 19” x 10.1” x 7.9” (482 x 257 x 200 mm) | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) |
| Drivers | 1x 189mm subwoofer + 2x 81mm woofers + 2x 20mm tweeters | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.2 |
| Strap | No | No |
| Guitar Input | - | Yes |
Watch Them Compared
Videos and reviews that test both speakers side by side.
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