Short answer: the Zealot S79. It ranks #41 of 85 large speakers by sound quality, rated 3.6/5, at $106.97; the Sony ULT Field 5 ranks #46, rated 3.5/5, and costs $348, so there is little reason to consider the other one.
What the Zealot S79 does well: Loud with plenty of bass and a wider soundstage than the JBL Xtreme 3, which it beats at full volume. The catch: At moderate volume the JBL Xtreme 3 is cleaner and more balanced, and one reviewer preferred the JBL Xtreme 4 in every way.
Why pick the Sony ULT Field 5: 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. The tradeoff: It prioritizes bass and loudness over fidelity: reviews find the upper mids and highs subdued, with limited stereo separation and soundstage depth.
Buy the Zealot S79. It is rated higher for sound quality than the Sony ULT Field 5 and costs less, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Zealot S79 | Sony ULT Field 5 | |
|---|---|---|
| Price | $106.97 | $348.00 |
| Ranked | #41 of 85 in Large Size Portable Bluetooth Speakers | #46 of 85 in Large Size Portable Bluetooth Speakers |
| Amplifier Power | 100W (150W peak) | 27W |
| Drivers | 2 woofers + 2 tweeters | 2x 46mm tweeters + 1x 79mm x 107mm woofer |
| Battery Life | 50+ hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Power Bank | Yes | Yes (USB-C) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| TWS | Yes | Yes |
| Lights | Yes | - |
| Weight | 7.3 lbs (3.3 kg) | 7.3 lbs (3.3 kg) |
| Dimensions | 13.4” x 7.2” x 5.7” (340 x 184 x 146 mm) | 12.6” x 5.7” x 4.9” (320 x 144 x 125 mm) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Strap | Yes (detachable shoulder strap) | Yes (detachable shoulder strap) |
| App | - | Yes |
| Aux Input | - | Yes |
| Bluetooth Codecs | - | SBC, AAC, LDAC |
| Built-in Microphone | - | Yes |
| EQ | - | Yes (App + ULT button) |
| IP Rating | - | IP67 |
| Party Mode | - | Yes (Party Connect up to 100 speakers) |
| Power Input | - | USB-C |
| Digital Aux Input | - | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Zealot S79:
- JBL Xtreme 5 vs Zealot S79
- Tribit Stormbox Lava vs Zealot S79
- Soundcore Boom 2 vs Zealot S79
- Bose SoundLink Max vs Zealot S79
- JBL Xtreme 3 vs Zealot S79
Prices on this page were last checked September 30, 2026 at 2:57 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
Zealot S79: $106.97 Amazon eBay
Pros: Loud with plenty of bass and a wider soundstage than the JBL Xtreme 3, which it beats at full volume. A huge 24,000mAh battery with a claimed 50+ hours doubles as a power bank, and it adds RGB lights, a shoulder strap, EQ modes and stereo pairing.
Cons: At moderate volume the JBL Xtreme 3 is cleaner and more balanced, and one reviewer preferred the JBL Xtreme 4 in every way. Its bass boost mode sounds muddy and can distort past about 70% volume, so it is best left on the normal EQ. The Harman Kardon Onyx Studio 8 digs deeper in the bass.
Full Zealot S79 review and specifications →
| Amplifier Power | 100W (150W peak) |
|---|---|
| Battery Life | 50+ hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 5.3 |
| Dimensions | 13.4” x 7.2” x 5.7” (340 x 184 x 146 mm) |
| Drivers | 2 woofers + 2 tweeters |
| Lights | Yes |
| Omnidirectional | No |
| Power Bank | Yes |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sony ULT Field 5: $348.00 Amazon eBay
Older models: the Sony SRS-XB43 (ranked lower, rated 3.5/5) and the Sony SRS-XG300 (ranked lower, 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 | Yes |
| 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