Short answer: the Yeahbox Sonic Boom Max 3. Both are rated 3.2/5 for sound quality (#59 and #61 of 112 boombox speakers), and the Yeahbox Sonic Boom Max 3 costs $228.99 against $448 for the Sony ULT Field 7, so with nothing between them on sound quality, price settles it.
What the Sony ULT Field 7 does well: A waterproof stereo party speaker with a 30 hour battery and karaoke mic and guitar inputs. The tradeoff: Bass is limited by its ~52Hz specification.
Why pick the Yeahbox Sonic Boom Max 3: A large party speaker with powerful bass, a big fast charging battery and app EQ for outdoor parties. Watch for: There is limited independent testing and the water/dust rating is reported inconsistently across listings.
Buy the Yeahbox Sonic Boom Max 3. Both are rated the same for sound quality, and it costs $219.01 less than the Sony ULT Field 7.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A waterproof stereo party speaker with a 30 hour battery and karaoke mic and guitar inputs.
A large party speaker with powerful bass, a big fast charging battery and app EQ for outdoor parties.
Prices on this page were last checked October 31, 2026 at 7:11 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.
Specifications Side By Side
| Sony ULT Field 7 | Yeahbox Sonic Boom Max 3 | |
|---|---|---|
| Price | $448.00 | $228.99 |
| Ranked | #61 of 112 in Boombox Size Portable Bluetooth Speakers | #59 of 112 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~52Hz | - |
| Battery Life | 30 hours (Manufacturer specified) | 111Wh (14.8V/7,500mAh) (Manufacturer specified) |
| Guitar Input | Yes | - |
| IP Rating | IP67 | IPX6 |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Party Mode | Yes (Party Connect up to 100 speakers) | - |
| Power Bank | Yes (USB-A, 5V/1.5A) | - |
| Power Input | AC Power cord | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| USB Playback | Yes | Yes |
| Weight | 13.9 lbs (6.3 kg) | 16.8 lbs (7.64 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC (inferred; additional codecs unverified) |
| App | No | Yes |
| EQ | Yes (App + ULT button) | Yes |
| TWS | Yes | Yes |
| Built-in Microphone | Yes | - |
| Bluetooth Version | 5.2 | 5.3 |
| Dimensions | 20.2” x 8.8” x 8.7” (512 x 224 x 222 mm) | 20.7” x 8.3” x 10.6” (525 x 210 x 268 mm) |
| Amplifier Power | 100W | 200W RMS / 300W Peak |
| Drivers | 2x 114mm x 114mm X-Balanced woofers + 2x 46mm (1.9”) tweeters | 189x114mm woofer, 2x 89mm midrange, 2x 38mm tweeters |
| Digital Aux Input | No | No |
| Strap | No | No |
| MicroSD Playback | - | Yes |
| Lights | - | Yes |
Related Speaker Comparisons
More worthwhile head-to-heads for Yeahbox Sonic Boom Max 3: