Short answer: the Gemini GRV-650L on value, the JBL Boombox 4 on output. The Gemini is pretty amazing value for the money with decently deep bass, though not quite as deep as the top ranked speakers. The JBL has pretty insane output for its size and a 7-band EQ, but it is overpriced, sounds worse than the Boombox 3 out of the box and drops the aux input.
Buy the JBL Boombox 4 when sound quality outweighs the price for you, and the Gemini GRV-650L when the price outweighs sound quality instead.
There is a real battery-life gap here: the JBL Boombox 4 is rated for 28 hours, the Gemini GRV-650L only 9 hours.
There is a real gap in water resistance: the JBL Boombox 4 at IP68 (extended submersion) against the Gemini GRV-650L, which has IPX5 (water jets).
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| JBL Boombox 4 | Gemini GRV-650L | |
|---|---|---|
| Price | $549.95 | $149.95 |
| Ranked | #20 of 91 in Boombox Size Portable Bluetooth Speakers | #51 of 91 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | No | Yes |
| Bass Extension (-10dB) | 41Hz | ~47Hz |
| Battery Life | 28 hours (Manufacturer specified) | 9 hours (Manufacturer specified) |
| EQ | Yes (7 band) | No |
| IP Rating | IP68 | IPX5 |
| Bluetooth Latency | AAC 144ms, SBC 48ms | - |
| Maximum SPL | 115dB (measured by Alan Ross Reviews) | 104dB (Manufacturer specified) |
| Party Mode | Yes (Auracast) | No |
| Power Input | AC Power cord | USB-C |
| Removable Battery | Yes | - |
| Stereo | Yes | Partially (1 woofer) |
| Omnidirectional | No | No |
| Weight | 13.2 lbs (5.98 kg) | 15.7 lbs (7.1 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, LC3, AAC | SBC |
| Bluetooth Version | 5.4 | 5.3 |
| Built-in Microphone | No | No |
| Power Bank | Yes (USB-C, up to 30W) | Yes |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| USB Playback | No | Yes |
| FM Tuner | No | Yes |
| Microphone Input | No | - |
| MicroSD Playback | No | Yes |
| Amplifier Power | 210W AC / 200W battery | 320W |
| Dimensions | 20.1” x 10.2” x 8.3” (510 x 260 x 210 mm) | 10.9” x 10.2” x 14.4” (277 x 260 x 366 mm) |
| Drivers | 2x 123mm woofers + 2x 20mm tweeters with passive radiators | 6.5” woofer + tweeter |
| Strap | No | No |
Related Speaker Comparisons
More top alternatives to JBL Boombox 4:
- Earfun Uboom X vs JBL Boombox 4
- JBL Boombox 4 vs Tribit Stormbox Blast
- Harman Kardon Go + Play 3 vs JBL Boombox 4
- JBL Boombox 4 vs JBL Partybox Encore 2
- JBL PartyBox On-The-Go 2 Plus vs JBL Boombox 4
Prices on this page were last checked October 4, 2026 at 9:58 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 Boombox 4: $549.95 Amazon B&H Photo Video eBay
Older models: the JBL Boombox 3 (ranked lower, rated 3.8/5), the JBL Boombox 2 (ranked lower, rated 3.5/5) and the JBL Boombox (ranked lower, rated 2.9/5).
Pros: Pretty insane output capability for the size. IP68 protection and Auracast pairing with other current JBL speakers. Measured bass extension of 41Hz (-10dB).
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 →
| Amplifier Power | 210W AC / 200W battery |
|---|---|
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 41Hz |
| Battery Life | 28 hours (Manufacturer specified) |
| Bluetooth | Yes |
| 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 |
| Maximum SPL | 115dB (measured by Alan Ross Reviews) |
| MicroSD Playback | No |
| Microphone Input | No |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Bank | Yes (USB-C, up to 30W) |
| Power Input | AC Power cord |
| Removable Battery | Yes |
| Stereo | Yes |
| Strap | No |
| 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!!!
- M1MTechChannel: Welche JBL Partybox ist die BESTE ? Alle Partyboxen im Vergleich | 2026 More from M1MTechChannel →
- M1MTechChannel: JBL BOOMBOX 4 - Einfach komplett GEISTESKRANK
- Head-to-Head Comparisons
Gemini GRV-650L: $149.95 Amazon eBay
Pros: Pretty amazing value for the money. Decently deep bass, not quite as good as top ranked speakers. Included wireless microphone and remote control. Measured bass extension of ~47Hz (-10dB).
Cons: Not quite as deep bass as the top ranked speakers.
Full Gemini GRV-650L review and specifications →
| Amplifier Power | 320W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~47Hz |
| Battery Life | 9 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 10.9” x 10.2” x 14.4” (277 x 260 x 366 mm) |
| Drivers | 6.5” woofer + tweeter |
| EQ | No |
| FM Tuner | Yes |
| IP Rating | IPX5 |
| Maximum SPL | 104dB (Manufacturer specified) |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | Yes |
| Power Input | USB-C |
| Stereo | Partially (1 woofer) |
| Strap | No |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 15.7 lbs (7.1 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Gemini GRV-650L vs W-King T11
- Gemini GRV-650L vs Skullcandy Barrel
- Gemini GRV-650L vs Sony ULT Field 7
- Gemini GRV-650L vs Onn Medium Party Speaker Gen 2
- Gemini GRV-650L vs JBL Partybox On the Go
- Gemini GRV-650L vs JBL Authentics 300
- Gemini GRV-650L vs W-King X20
- Gemini GRV-650L vs Soundcore Boom 2 Plus
- See all 27 comparisons