Short answer: it’s close, and comes down to features versus weight. These rank #56 and #38 out of 111 portable speakers, separated by only 18 places, with the ULT Field 5 at $268 against the Boom 2 Plus’s $179.99.
Both speakers prioritize bass and loudness over tonal precision. The ULT Field 5’s cons state it prioritizes bass and loudness over fidelity, with subdued upper mids and highs and limited stereo separation, and note its deep bass is less authoritative than the enclosure suggests. The Boom 2 Plus’s cons describe a warm tuning with rolled off treble and some upper bass boost, with bass that’s reasonably deep but not as good as the top ranked speakers.
The ULT Field 5 has more onboard features. Its pros list LDAC and AAC codec support, a 10-band app EQ plus a dedicated ULT bass button with two modes, Party Connect, aux input, and USB-C power-bank output, all backed by a claimed 25 hour battery. The Boom 2 Plus’s main advantage by comparison is being noticeably lighter than most boombox-size speakers, which matters if you’re moving it around often.
Buy the ULT Field 5 for the richer feature set: LDAC, app EQ, aux input, and power-bank charging out.
Buy the Boom 2 Plus if you want a lighter boombox-style speaker and don’t need Sony’s extra codec and connectivity features.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A tough, waterproof party speaker with loud, bass focused output, an aux input, a power bank and a long battery.
A fairly light stereo boombox, easy to carry to the beach or park.
Prices on this page were last checked October 23, 2026 at 8:27 AM 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 5 | Soundcore Boom 2 Plus | |
|---|---|---|
| Price | $268.00 | $179.99 |
| Ranked | #56 of 114 in Large Size Portable Bluetooth Speakers | #38 of 111 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | Yes | Yes |
| Battery Life | 25 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LDAC | SBC, AAC |
| Bluetooth Version | 5.3 | 5.3 |
| Built-in Microphone | Yes | Yes |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) | 17.3” x 9.1” x 5.9” (440 x 230 x 150 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer | 2x 114mm (4.5”) woofers + 2x 19mm (0.75”) tweeters |
| EQ | Yes (App + ULT button) | Yes (Pro EQ + presets) |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Party Connect up to 100 speakers) | Yes (PartyCast 2.0) |
| Power Bank | Yes (USB-C) | Yes (USB-C, 5V/2A) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | 8.4 lbs (3.8 kg) |
| Amplifier Power | 27W | 140W |
| Digital Aux Input | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (detachable strap) |
| Bass Extension (-10dB) | - | 39Hz |
| Maximum SPL | - | 111dB (measured by Alan Ross Reviews) |
| MicroSD Playback | - | No |
| USB Playback | - | No |
| Lights | - | Yes |
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