Short answer: neither is the bass champion of this class, so pick on the specifics that matter to you - true stereo and power-bank output favor the Bromley 750, lighter weight favors the Soundboks 4. These rank #13 and #10 out of 13 large-party speakers, at $999.99 and $1,199.
Both share a similar weak point. The Soundboks 4’s own notes say it isn’t as neutral or as deep in the bass as the Partybox-class speakers above it, and the Bromley 750’s notes say much the same about its own bass and overall frequency response. Neither is the pick here if deep, neutral bass is the priority - look at the Partybox line or the Electro-Voice Everse speakers instead.
The Bromley 750 has real stereo separation; the Soundboks 4 doesn’t. The Bromley 750’s driver layout is genuine stereo, while the Soundboks 4 is a mono cabinet. The Bromley 750 also has a USB-C power-bank port for charging your phone, which the Soundboks 4 lacks, and slightly more battery life on paper - 40-plus hours against 40.
The Soundboks 4 is lighter and reaches similar peak loudness for its size. At 15.4 kg (34 lbs) it’s well under two-thirds the Bromley 750’s weight, and its high-efficiency driver design is built to reach 2-3x the volume of a typical speaker at the same wattage - the same approach used by Electro-Voice’s Everse line.
Buy the Bromley 750 for true stereo sound and a power-bank port. Buy the Soundboks 4 if you want something noticeably lighter to move around.
Want more options? Browse the full Portable Bluetooth rankings and PA & Live Sound rankings.
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Specifications Side By Side
| Marshall Bromley 750 | Soundboks 4 | |
|---|---|---|
| Price | $999.99 | $1199 |
| Ranked | #13 of 13 in Large Party Size Portable Bluetooth Speakers | #10 of 17 in Battery-Powered PA Speakers |
| Aux Input | Yes (3.5mm, RCA) | Yes |
| Battery Life | 40+ hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC, LC3 | SBC |
| Guitar Input | Yes | Yes |
| IP Rating | IP54 | IP65 |
| Microphone Input | Yes (2x XLR/6.35mm combo) | Yes |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | AC Power cord |
| Weight | 52.7 lbs (23.9 kg) | 34 lbs (15.4 kg) |
| XLR Input | Yes (2x combo) | Yes (2x combo) |
| App | Yes (Marshall Bluetooth app) | Yes |
| Built-in Microphone | No | - |
| EQ | Yes | Yes |
| Party Mode | Yes (Auracast) | Yes (TeamUp, up to 5 speakers) |
| Stereo | Yes | Yes |
| Omnidirectional | Yes | No |
| TWS | No | Yes |
| USB Playback | No | No |
| Wi-Fi | No | - |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 16.3” x 25.7” x 14” (413 x 652 x 355 mm) | 25.6” x 17” x 13” (650.2 x 431.8 x 330.2 mm) |
| Drivers | 2x 10” woofers, 2x 5.25” mid-ranges, 2x 1” tweeters, 2x 0.8” tweeters | 2x 10” woofers, 1” compression driver |
| Amplifier Power | 400W | 216W (3x 72W) |
| Digital Aux Input | Yes (USB-C) | No |
| Removable Battery | Yes | Yes |
| Charging Time | 3.5 hours | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 40Hz - 20kHz (Manufacturer specified) |
| Lights | Yes | - |
| Strap | No | - |
| Passive | - | No |
| Bass Extension (-10dB) | - | 52Hz |
| Inputs | - | 2x XLR/6.3mm combo (mic/instrument), 3.5mm stereo, Bluetooth |
| Maximum SPL | - | 126dB |
| SKAA | - | Yes |
| Configuration | - | Battery-powered 3-way active PA |
| Cabinet Material | - | Poplar plywood |
| DSP | - | App EQ |
| Rigging | - | 35mm pole mount socket |
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