Short answer: the JBL Boombox 4. It ranks #17 of 73 boombox speakers by sound quality at $549.95; the Diamondboxx M3 ranks #51 and costs $700, so there is not much of a tradeoff to weigh.
The case for the JBL Boombox 4: Pretty insane output capability for the size, with 7-band EQ for better tuning than the Boombox 3. The catch: It’s overpriced for the category, sounds worse than the Boombox 3 out of the box, and drops Aux input entirely.
What the Diamondboxx M3 gets right: 114dB output. 200W RMS (400W max) Class A/B amplifier with dual 4” woofers and active crossovers. Set against that: Not as deep bass as even the hyperboom. Bass distorted at high levels.
Buy the JBL Boombox 4. It ranks higher for sound quality than the Diamondboxx M3 and costs less, so there is no real case for the other one.
If water resistance matters to you, the JBL Boombox 4 at IP68 (extended submersion) holds up far better than the Diamondboxx M3 at no water resistance.
Specifications Side By Side
| JBL Boombox 4 | Diamondboxx M3 | |
|---|---|---|
| Price | $549.95 | $700 |
| Ranked | #17 of 73 in Boombox Size Portable Bluetooth Speakers | #51 of 73 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | Yes |
| Bass Extension (-10dB) | 41Hz | - |
| Battery Life | 28 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| EQ | Yes (7 band) | No |
| IP Rating | IP68 | None |
| Bluetooth Latency | AAC 144ms, SBC 48ms | - |
| Max Volume | 115dB | - |
| Party Mode | Yes (Auracast) | No |
| Power Input | AC Power cord | USB-C |
| Removable Battery | Yes | - |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 13.2 lbs / 5.98 kg | 11 lbs / 5 kg |
| Bluetooth Codecs | SBC, LC3, AAC | SBC |
| Bluetooth Version | 5.4 | - |
| Built in Microphone | No | No |
| Power Bank | Yes (USB-C, up to 30W) | No |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| USB Playback | No | No |
| FM Tuner | No | No |
| Microphone Input | No | - |
| MicroSD Playback | No | - |
| Output Power | 210W AC / 200W battery | 200W RMS / 400W peak |
| Dimensions | 20.1" x 10.2" x 8.3" (510 x 260 x 210 mm) | 14.7" x 9" x 8" (373.4 x 228.6 x 203.2 mm) |
| Drivers | 2x 123mm woofers + 2x 20mm tweeters with passive radiators | 3" woofer + tweeter array |
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Prices on this page were last checked August 21, 2026 at 5:30 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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The Two Speakers In Full
JBL Boombox 4: $549.95 Amazon Bhphotovideo eBay
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.
Full JBL Boombox 4 review and specifications →
| 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 |
| Bluetooth Version | 5.4 |
| Built in Microphone | No |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 20.1" x 10.2" x 8.3" (510 x 260 x 210 mm) |
| Drivers | 2x 123mm woofers + 2x 20mm tweeters with passive radiators |
| EQ | Yes (7 band) |
| FM Tuner | No |
| IP Rating | IP68 |
| Max Volume | 115dB |
| MicroSD Playback | No |
| Microphone Input | No |
| Omnidirectional | No |
| Output Power | 210W AC / 200W battery |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C, up to 30W) |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 13.2 lbs / 5.98 kg |
- Links
- Reviews, Comparisons and Sound Samples
- JOY‘s 🎧3D🔈Audio-Show: JBL Boombox 4 vs Boombox 3 - old one sounding better? 🤔 More from Oluv’Sone →
- 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! More from alanrossreviews →
- 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!!! More from Jagistreviews →
- Techder Audios: JBL Boombox 4 VS Zealot ZE21 BATTLE OF THE BOOMBOXES! More from techderaudios →
- Dominik Reviews: Zealot S89 vs JBL Boombox 4 - JBL Alternative? Sound Test More from Dominik Reviews →
- Jagist reviews: Jbl Boombox 4 Vs Zealot S89!!!
- Jagist reviews: Jbl Boombox 4 Vs Zealot S95!!!
- Reddit Search for JBL Boombox 4 Review
- Head-to-Head Comparisons
- JBL Boombox 4 vs Zealot S89
- JBL Boombox 4 vs Harman Kardon Go + Play 2
- JBL Boombox 4 vs Zealot ZE21
- JBL Boombox 4 vs Harman Kardon Onyx Studio 5
- JBL Boombox 4 vs Zealot ZE41
- JBL Boombox 4 vs JBL Boombox 3 Wifi
- JBL Boombox 4 vs JBL Boombox 3
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- See all 76 comparisons
Diamondboxx M3: $700 eBay
Pros: 114dB output. 200W RMS (400W max) Class A/B amplifier with dual 4” woofers and active crossovers. Multiple battery options (115Wh or 231Wh). Weighs just 12 lbs, fits in overhead compartments. Aluminum heatsink survives full-blast heat.
Cons: Not as deep bass as even the hyperboom. Bass distorted at high levels. Too much treble. Too expensive. No water rating.
Full Diamondboxx M3 review and specifications →
| App | No |
|---|---|
| Aux Input | Yes |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Built in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 14.7" x 9" x 8" (373.4 x 228.6 x 203.2 mm) |
| Drivers | 3" woofer + tweeter array |
| EQ | No |
| FM Tuner | No |
| IP Rating | None |
| Omnidirectional | No |
| Output Power | 200W RMS / 400W peak |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 11 lbs / 5 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons