These are not really the same size class, and that is the honest framing here. The Soundcore Boom 3i ranks #31 of 179 medium speakers by sound quality at $118.99; the JBL Go 4 ranks #30 of 62 small speakers by sound quality at $49.95.
The Soundcore Boom 3i is the deeper-bass, longer-running option. A warm, punchy waterproof speaker that sounds great and is a strong value. Its bass reaches about 56Hz before falling 10dB, against 82Hz for the JBL Go 4. It is rated for 16 hours of battery against 7 for the JBL Go 4. It supports AAC Bluetooth, which the JBL Go 4 lacks. Watch for: Not quite as good as a JBL Charge 5, doesn’t go quite as loud or sound quite as balanced, but very very close.
The JBL Go 4 is the lighter pick. A pocket sized waterproof mini speaker with a loop for hanging and app EQ. At 0.4 lbs (190 g) it weighs much less than the Soundcore Boom 3i at 1.7 lbs (783 g). It links with other speakers (Auracast), which the Soundcore Boom 3i cannot. Watch for: Not much bass at all, especially with electronic/bass-heavy tracks pushed past ~50% volume.
Buy the Soundcore Boom 3i ($118.99) for a medium speaker; the JBL Go 4 ($49.95) suits a small speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| Soundcore Boom 3i | JBL Go 4 | |
|---|---|---|
| Price | $118.99 | $49.95 |
| Ranked | #31 of 179 in Medium Size Portable Bluetooth Speakers | #30 of 62 in Small Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 56Hz | ~82Hz |
| Battery Life | 16 hours (Manufacturer specified) | 7 hours (Manufacturer specified) |
| EQ | Yes | Yes |
| IP Rating | IP68 | IP67 |
| Party Mode | No | Yes (Auracast) |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | Pointing up |
| TWS | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 8.3” x 3.3” x 3.1” (210 x 85 x 78.5 mm) | 3.7” x 3” x 1.7” (94.3 x 75.7 x 42.2 mm) |
| Drivers | 94mm woofer + tweeter | 45mm |
| Weight | 1.7 lbs (783 g) | 0.4 lbs (190 g) |
| Amplifier Power | 50W | 4.2W |
| Bluetooth Codecs | SBC, AAC | SBC |
| Built-in Microphone | Yes | Yes |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | Yes (detachable strap) | Yes (built-in loop) |
| Power Bank | - | No |
| Frequency Response | - | 90Hz - 20kHz (Manufacturer specified) |
| Charging Time | - | 3 hours |
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