Short answer: the JBL Xtreme 4 if sound quality matters most, the Zealot S79 if price matters most. The JBL Xtreme 4 ranks #40 of 83 large speakers, rated 3.8/5, at $309.95. The Zealot S79 ranks #41, rated 3.6/5, at $106.97, $202.98 cheaper.
In a full sound battle the reviewer preferred the JBL Xtreme 4 in every way, at mid volume and at max volume. The Zealot S79 is very loud with good bass, but its sound was less pleasant, especially in its bass EQ mode, which sounded muddy.
If you do buy the Zealot, leave it on the normal EQ. Its strengths are a huge 24,000mAh battery with a claimed 50+ hours, RGB lights, a shoulder strap and a power bank output.
The Xtreme 4 adds IP67 protection, the JBL Portable app with EQ, Auracast multi speaker linking and a replaceable battery.
Buy the JBL Xtreme 4 if sound quality is the priority over the price, or the Zealot S79 if the price is the priority over sound quality.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| JBL Xtreme 4 | Zealot S79 | |
|---|---|---|
| Price | $309.95 | $106.97 |
| Ranked | #40 of 83 in Large Size Portable Bluetooth Speakers | #41 of 83 in Large Size Portable Bluetooth Speakers |
| App | Yes | - |
| Aux Input | No | - |
| Battery Life | 24 hours (Manufacturer specified) | 50+ hours (Manufacturer specified) |
| EQ | Yes (5 band) | - |
| IP Rating | IP67 | - |
| Bluetooth Latency | 220ms | - |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Auracast) | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | - |
| Removable Battery | Yes | - |
| TWS | Yes | Yes |
| Weight | 4.6 lbs (2.1 kg) | 7.3 lbs (3.3 kg) |
| Bluetooth Codecs | SBC | - |
| Built-in Microphone | Yes | - |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) | 13.4” x 7.2” x 5.7” (340 x 184 x 146 mm) |
| Drivers | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators | 2 woofers + 2 tweeters |
| Frequency Response | 44Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 100W | 100W (150W peak) |
| Digital Aux Input | No | - |
| Strap | Yes (detachable shoulder strap) | Yes (detachable shoulder strap) |
| Lights | - | Yes |
Related Speaker Comparisons
How JBL Xtreme 4 compares with other leading options:
- JBL Xtreme 4 vs Vifa Helsinki
- JBL Xtreme 5 vs JBL Xtreme 4
- JBL Xtreme 4 vs Tribit Stormbox Lava
- Brane X vs JBL Xtreme 4
- JBL Xtreme 4 vs Minirig 4 with subwoofer
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
JBL Xtreme 4: $309.95 Amazon B&H Photo Video eBay
Newer model: the JBL Xtreme 5, ranked higher, rated 4.6/5.
Pros: A rugged 2.1kg portable with IP67 protection, a replaceable battery, USB-C power-bank output, Auracast, stereo pairing and a useful 5-band app EQ. Independent reviews find the midrange detailed and the sound clear, punchy and refined for outdoor use; it also reaches a strong 106dB maximum level and has excellent real-world battery life.
Cons: It cannot produce the deep rumble of a larger speaker, and bass compression increases near maximum volume. The front-facing layout has only modest off-axis consistency, Bluetooth latency is high for video, and the default balance benefits from EQ adjustment. There is no aux input, so wired sources are not supported. Out of the box it leans bass-boosted, with a dip between the upper bass and midrange that EQ cannot fix, and it pushes the upper mids and treble at high volume. It is also expensive.
Full JBL Xtreme 4 review and specifications →
| Amplifier Power | 100W |
|---|---|
| App | Yes |
| Aux Input | No |
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 220ms |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.7” x 5.9” x 5.6” (297 x 149 x 141 mm) |
| Drivers | 2x 70mm woofers, 2x 19mm tweeters + 2x passive radiators |
| EQ | Yes (5 band) |
| Frequency Response | 44Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Maximum SPL | 106dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C) |
| Power Input | USB-C |
| Removable Battery | Yes |
| Stereo | Yes |
| Strap | Yes (detachable shoulder strap) |
| TWS | Yes |
| Weight | 4.6 lbs (2.1 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- JOY‘s 🎧3D🔈Audio-Show: JBL Charge 6, Xtreme 4 & Earfun UBoom X - taking sound to the top More from Oluv’Sone →
- JOY‘s 🎧3D🔈Audio-Show: JBL Charge 6 vs JBL Xtreme 4 - outdoor test
- JOY‘s 🎧3D🔈Audio-Show: JBL Charge 6 vs JBL Xtreme 4 - basstest (bigger=better?)
- Alan Ross Reviews: JBL Xtreme 4 vs Flip 7 vs Charge 6 – The ULTIMATE JBL Speaker Showdown! More from alanrossreviews →
- Oluv Patreon: SoundCore Boom 3i - first impressions & EQs
- Mateusz Cholewa: TRIBIT StormBox LAVA Deep BASS 🆚 JBL XTREME 4 More from Mateusz Cholewa →
- Mateusz Cholewa: Marshall Middleton👌🎶 🆚 JBL Xtreme 4 🎶📢
- Oluv Patreon: JBL Xtreme 4 - sound analysis
- Oluv Patreon: JBL Xtreme 4 - unboxing & first impressions
- Oluv Patreon: Harman Kardon go+play 3 vs JBL Xtreme 4 - first impressions
- Dominik Reviews: JBL Xtreme 4 vs JBL Xtreme 3 Sound Test 😍 Best upgrade in the history? 😂 More from Dominik Reviews →
- M1MTechChannel: Welche JBL Partybox ist die BESTE ? Alle Partyboxen im Vergleich | 2026 More from M1MTechChannel →
- Mateusz Cholewa: BOGASING S8 Pro Max 100W vs JBL Xtreme 4 Audio Test
- Mateusz Cholewa: LOEWE We HEAR Pro Super Stereo vs JBL Xtreme 4
- Head-to-Head Comparisons
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. The evidence is listening comparisons, not measurements.
Full Zealot S79 review and specifications →
| Amplifier Power | 100W (150W peak) |
|---|---|
| Battery Life | 50+ hours (Manufacturer specified) |
| 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) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons