Short answer: the Zealot ZE21. It ranks #15 of 70 boombox speakers at $187.15; the JBL Boombox 4 ranks #17 and costs $549.95, so there is not much of a tradeoff to weigh.
On the JBL Boombox 4 side: Pretty insane output capability for the size. Set against that: Pretty overpriced for the category.
The case for the Zealot ZE21: Great value for the bass performance, play time and max volume in the boombox class, though the Zealot ZE41 now beats it out. The tradeoff: A little rolled off up top and not that balanced through the rest of the range.
Buy the JBL Boombox 4 if the price matters more than the ranking. Buy the Zealot ZE21 if the ranking matters more than the price.
Specifications Side By Side
| JBL Boombox 4 | Zealot ZE21 | |
|---|---|---|
| Price | $549.95 | $187.15 |
| Ranked | #17 of 70 in Boombox Size Portable Bluetooth Speakers | #15 of 70 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | Yes |
| Bass Extension (-10dB) | 41Hz | 36Hz |
| Battery Life | 28 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| EQ | No | Yes (multiple modes) |
| IP Rating | IP68 | IPX6 |
| Bluetooth Latency | AAC 144ms, SBC 48ms | - |
| Max Volume | 115dB | 116dB |
| Party Mode | Yes (Auracast) | No |
| Power Input | AC Power cord | USB-C |
| Removable Battery | Yes | - |
| Stereo | Yes | Yes |
| Weight | 13.2 lbs / 5.98 kg | 20.4 lbs / 9.27 kg |
| Bluetooth Codecs | SBC, LC3, AAC | SBC |
| Built in Microphone | No | No |
| Power Bank | Yes | Yes |
| TWS | Yes | Yes |
| USB Audio | Yes | - |
| USB Playback | No | Yes |
| FM Tuner | No | - |
| Microphone Input | No | - |
| MicroSD Playback | No | Yes |
| Output Power | 210W AC / 200W battery | 250W |
| Dimensions | 51cm x 26cm x 21cm | 424mm x 262mm x 363mm |
| Drivers | 2x 123mm woofers + 2x 20mm tweeters with passive radiators | 130W subwoofer + 2x 50mm woofers + passive radiators |
The Two Speakers In Full
JBL Boombox 4: $549.95 Amazon Bhphotovideo
Pros: Pretty insane output capability for the size.
Cons: Pretty overpriced for the category. Better than the Boombox 3 mostly because there are more 7 EQ bands instead of just 3 and it can be better tuned. Try Oluv’s EQ for it. Out of the box sounds worse than the Boombox 3. No Aux input.
| App | Yes |
|---|---|
| Aux Input | No |
| Bass Extension (-10dB) | 41Hz |
| Battery Life | 28 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, LC3, AAC |
| Bluetooth Latency | AAC 144ms, SBC 48ms |
| Built in Microphone | No |
| Dimensions | 51cm x 26cm x 21cm |
| Drivers | 2x 123mm woofers + 2x 20mm tweeters with passive radiators |
| EQ | No |
| FM Tuner | No |
| IP Rating | IP68 |
| Max Volume | 115dB |
| MicroSD Playback | No |
| Microphone Input | No |
| Output Power | 210W AC / 200W battery |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| Stereo | Yes |
| TWS | Yes |
| USB Audio | Yes |
| USB Playback | No |
| Weight | 13.2 lbs / 5.98 kg |
- Reviews, Comparisons and Sound Samples
- JOY‘s 🎧3D🔈Audio-Show: JBL Boombox 4 vs Boombox 3 - old one sounding better? 🤔
- JOY‘s 🎧3D🔈Audio-Show: JBL Boombox 4 vs Earfun UBoom X - sound test
- JOY‘s 🎧3D🔈Audio-Show: JBL Boombox 4 vs Boombox 3 - any improvement?
- JOY‘s 🎧3D🔈Audio-Show: JBL Boombox 4 vs Partybox Encore 2 - outdoor loudness & basstest
- JOY‘s 🎧3D🔈Audio-Show: JBL Boombox 4 - finally a real BOOMbox from JBL 👏
- Alan Ross Reviews: JBL Boombox 4 HUMILIATES Brane X?! Ultimate Bass Battle!
- Alan Ross Reviews: JBL Boombox 4 Compared to Boombox 3 & 3 WiFi – Worth the Upgrade?
- Alan Ross Reviews: JBL Boombox 4 distortion fest bonanza! how bad can it be lol 🤣
- Jagist reviews: Jbl Boombox 4 Vs Zealot Ze21!!!
- Techder Audios: JBL Boombox 4 VS Zealot ZE21 BATTLE OF THE BOOMBOXES!
- Dominik Reviews: Zealot S89 vs JBL Boombox 4 - JBL Alternative? Sound Test
- Jagist reviews: Jbl Boombox 4 Vs Zealot S89!!!
- Jagist reviews: Jbl Boombox 4 Vs Zealot S95!!!
- Head-to-Head Comparisons
- Links
Zealot ZE21: $187.15 Aliexpress Amazon
Pros: Great value for the bass performance, play time and max volume in the boombox class, though the Zealot ZE41 now beats it out.
Cons: A little rolled off up top and not that balanced through the rest of the range. Clarity isn’t as good as better speakers. Bass EQ is bloated and muddy sounding
| App | No |
|---|---|
| Aux Input | Yes |
| Bass Extension (-10dB) | 36Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Dimensions | 424mm x 262mm x 363mm |
| Drivers | 130W subwoofer + 2x 50mm woofers + passive radiators |
| EQ | Yes (multiple modes) |
| IP Rating | IPX6 |
| Max Volume | 116dB |
| MicroSD Playback | Yes |
| Output Power | 250W |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 20.4 lbs / 9.27 kg |
- Reviews, Comparisons and Sound Samples
- Jagist reviews: Jbl Boombox 4 Vs Zealot Ze21!!!
- Jagist reviews: Zealot Ze21 Vs Tribit Stormbox Blast 2!!!
- Techder Audios: JBL Boombox 4 VS Zealot ZE21 BATTLE OF THE BOOMBOXES!
- Jay’s Straight Up Reviews & More: Zealot ZE21 vs JBL Boombox 3 Tailgater Special @20ft. The Budget Beast Against the OG Boombox
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.