These sit in different size classes, so this is not a straight ranking comparison. The Marshall Stockwell II ranks #11 of 120 large speakers by sound quality at $229.99; the Soundcore Boom 3i ranks #31 of 179 medium speakers by sound quality at $118.99.
The Marshall Stockwell II is the deeper-bass pick. A light, strap equipped speaker with some of the most natural sound around, even off to the side, and a long battery. Its bass reaches about 44Hz before falling 10dB, against 56Hz for the Soundcore Boom 3i. It keeps a wired aux input, which the Soundcore Boom 3i lacks. Watch for: Not very loud, and the added DSP reverb may annoy purists.
The Soundcore Boom 3i is the lighter, tougher pick. A warm, punchy waterproof speaker that sounds great and is a strong value. At 1.7 lbs (783 g) it weighs much less than the Marshall Stockwell II at 3.1 lbs (1.4 kg). It is rated IP68 against IPX4 for the Marshall Stockwell II. It supports AAC Bluetooth, which the Marshall Stockwell II 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.
Buy the Marshall Stockwell II at $229.99 if you want a large speaker. Buy the Soundcore Boom 3i at $118.99 if you want a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| Marshall Stockwell II | Soundcore Boom 3i | |
|---|---|---|
| Price | $229.99 | $118.99 |
| Ranked | #11 of 120 in Large Size Portable Bluetooth Speakers | #31 of 179 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| Bass Extension (-10dB) | 44Hz | 56Hz |
| Battery Life | 20 hours (Manufacturer specified) | 16 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC |
| IP Rating | IPX4 | IP68 |
| Bluetooth Latency | 50ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | No | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| Weight | 3.1 lbs (1.4 kg) | 1.7 lbs (783 g) |
| App | No | Yes |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes |
| Power Bank | No | - |
| Bluetooth Version | 5.0 | 5.3 |
| Dimensions | 7.1” x 6.3” x 2.8” (180 x 161 x 70 mm) | 8.3” x 3.3” x 3.1” (210 x 85 x 78.5 mm) |
| Drivers | 3” woofer, 2x 2” fullrange tweeters | 94mm woofer + tweeter |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 20W | 50W |
| Digital Aux Input | No | No |
| Strap | Yes (built-in strap) | Yes (detachable strap) |
| Lights | - | Yes |
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