Short answer: the Sony ULT Field 5. It ranks #44 of 82 large speakers by sound quality, rated 3.5/5, at $198; the Turtlebox Cub ranks #60, rated 3.0/5, and costs $330, so there is little reason to consider the other one.
The ULT Field 5 prioritizes bass and loudness over fidelity, with subdued upper mids and highs. It has LDAC, a 10-band app EQ, an aux input and stereo from one unit. The Cub has only listening impressions so far: loud for its size, warm and bass-forward, with some bass loss at high volume.
Both are IP67 with a USB-C power bank and multi-speaker linking.
Battery: a claimed 25 hours for the ULT Field 5 against 14+ for the Cub.
Weight: 3.3 kg for the ULT Field 5, 2.4 kg for the Cub.
Buy the Sony ULT Field 5. It is rated higher for sound quality than the Turtlebox Cub and costs less, which makes it the one to get unless you need something the other one does better.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Sony ULT Field 5 | Turtlebox Cub | |
|---|---|---|
| Price | $198 | $330.00 |
| Ranked | #44 of 82 in Large Size Portable Bluetooth Speakers | #60 of 82 in Large Size Portable Bluetooth Speakers |
| App | Yes | - |
| Aux Input | Yes | - |
| Battery Life | 25 hours (Manufacturer specified) | 14+ hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC | - |
| Bluetooth Version | 5.3 | - |
| Built-in Microphone | Yes | - |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) | 8.6”H x 7.2”W x 5.7”D (218 x 183 x 146 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer | 1x 4.5” (114mm) woofer + 1x 1.3” (33mm) titanium tweeter |
| EQ | Yes (App + ULT button) | - |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Party Connect up to 100 speakers) | Yes (Party Mode) |
| Power Bank | Yes (USB-C) | Yes (USB-C) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | 5.3 lbs (2.4 kg) |
| Amplifier Power | 27W | - |
| Digital Aux Input | No | - |
| Strap | Yes (detachable shoulder strap) | - |
Related Speaker Comparisons
More worthwhile head-to-heads for Sony ULT Field 5:
- Sony ULT Field 5 vs Vifa Helsinki
- JBL Xtreme 5 vs Sony ULT Field 5
- Tribit Stormbox Lava vs Sony ULT Field 5
- Sony ULT Field 5 vs Brane X
- Minirig 4 with subwoofer vs Sony ULT Field 5
Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Sony ULT Field 5: $198 Amazon eBay
Older models: the Sony SRS-XB43 (rated 3.5/5) and the Sony SRS-XG300 (rated 3.1/5).
Pros: A tough 3.3kg portable with IP67 protection, LDAC/AAC support, aux input, a 10-band app EQ, Party Connect, USB-C power-bank output and a claimed 25-hour battery. Reviews find it energetic and dynamic with substantial bass, enough volume for a yard, and two ULT modes that let bass-focused listeners choose a deeper or punchier presentation.
Cons: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth. Deep bass is less authoritative than the enclosure suggests, and the loud confirmation tone when pressing the ULT button is an unnecessary annoyance. Use the app EQ and audition it before buying for detail-focused music.
Full Sony ULT Field 5 review and specifications →
| Amplifier Power | 27W |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, LDAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Drivers | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| EQ | Yes (App + ULT button) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Connect up to 100 speakers) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Danny Pops: Don’t TOUCH that ULT Button! Sony ULT Field 5 Review More from DannyPops →
- Mark Ellis Reviews: Sony just changed summer sound 🤨 | Sony ULT Field 5 & 3 Review
- Dominik Reviews: Sony ULT Field 5 vs JBL Xtreme 4 - Outdoor Sound Test - Sony shines or not? More from Dominik Reviews →
- Joy & Oluv’Sone: Sony ULT Field 5 vs Anker SoundCore Boom 2 - listening test More from Oluv’Sone →
- Mateusz Cholewa: SONY ULT Field 5 vs BOGASING S8 PRO MAX More from Mateusz Cholewa →
- Head-to-Head Comparisons
Turtlebox Cub: $330.00 Amazon eBay
Pros: A compact, cube-shaped Turtlebox at 2.4 kg with a real two-way layout: a 4.5 inch woofer and a 1.3 inch titanium tweeter. Reviewers found it very loud for its size, with warm, bass-forward tuning and a bit more bass than the Turtlebox Ranger. IP67 waterproof and dustproof, crush and drop resistant, stainless steel tie-downs, a claimed 14+ hours from a 49.95Wh battery, USB-C charging with a power bank output, stereo pairing and Party Mode.
Cons: The evidence so far is listening impressions from two reviews, with no measurements or side by side tests against other brands. One reviewer found it loses bass at high volume, and it is not as loud as the full-size Turtlebox. Turtlebox’s claimed 118dB is a figure the brand’s larger speakers have not come close to at a standard one meter distance. It is also mono from one unit, and its recessed USB-C port only fits slim cable plugs.
Full Turtlebox Cub review and specifications →
| Battery Life | 14+ hours (Manufacturer specified) |
|---|---|
| Dimensions | 8.6”H x 7.2”W x 5.7”D (218 x 183 x 146 mm) |
| Drivers | 1x 4.5” (114mm) woofer + 1x 1.3” (33mm) titanium tweeter |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Mode) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 5.3 lbs (2.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Turtlebox Cub vs Marshall Stockwell III
- Turtlebox Cub vs JBL Xtreme 4
- Turtlebox Cub vs Marshall Middleton
- Turtlebox Cub vs Bose SoundLink Plus
- Turtlebox Cub vs Teufel Rockster Cross 2
- Turtlebox Cub vs Bose SoundLink Max
- Turtlebox Cub vs Soundcore Boom 2
- Turtlebox Cub vs Tribit Stormbox Lava
- See all 13 comparisons