Soundboks 4 vs Marshall Bromley 750: 2026 Comparison Guide

The first in our review series comparing party speakers’ performance, design, price, and more.

There aren’t many brands who have impacted music culture like Marshall. Founded in 1962, countless numbers of rock royalty have used their amps all over the world. Today, it’s almost impossible to walk down the street without seeing a pair of their headphones or portable speakers. They are a true heritage brand.

Within the context of party speakers, though, Marshall are the new kids on the block. The Bromley 750 is the first time they've ever produced one. The Soundboks 4–a.k.a. the Godzilla of “portable” party speakers–is our fourth-generation party speaker. While Marshall has a broad musical focus, we have one mission: to give you the tools you need to party.

Now we’ve covered a little bit about what we both represent, let’s get into the speakers themselves.

Note: all information has been taken from the Soundboks 4 product page and Marshall Bromley 750 product page.

The numbers don’t lie. Instead of crunching them here, though, we’ll break them down into separate categories.

According to Rolling Stone, the Bromley 750’s True Stereophonic 360° sound “spreads evenly around the room, with audio travelling outward and upward rather than feeling directional.” This is thanks to the party speaker’s audio design. Its woofers, tweeters, mid-ranges, and amplifiers sit on all four faces. This fires sound from every angle.

The Soundboks 4’s front-firing design is the opposite. Your sound directs wherever the speaker is positioned. This more traditional approach creates sweet spots, allowing you to intentionally concentrate your sound to where the crowd is.

The Bromley 750 is better designed to act as a party centerpiece. Place it in the middle of the room and it fills the space evenly. Think of it like stereo sound. On the flipside, the Soundboks 4 is better designed to channel all its energy into specific areas. Giving you more control, this allows you to manipulate your party’s space more effectively and create contrast.

How you position your speaker isn’t the only influence on performance. As indoor party speakers, both sound great. But as outdoor party speakers, there’s a big difference. The Marshall Bromley 750’s True Stereophonic 360° sound disappears. When there aren’t any walls to keep the sound contained, it vanishes. Our Soundboks 4 can stand up to outdoor conditions and spaces, delivering the same performance as it does indoors.

If you want evenly distributed sound from a central position, the Bromley 750 is the one for you. But if you want to create dancefloors, focus your sound intentionally, and maintain performance outdoors, the Soundboks 4 is the better party speaker.

When you look at both speakers, you’d expect them to be super loud. They’re big, bold, and look the business. Funnily enough, you’d be right. Soundboks 4’s maximum volume is 126 dB while the Marshall Bromley 750 delivers 127 dB. That's the same kind of volume as a stadium concert or jet engine–more than enough power for parties of 100+ people.

When it comes to audio performance, we’re sure that the Soundboks 4 is the best party speaker out there. A big sonic upgrade from the first three generations, it delivers crystal clear, distortion-free sound at any volume.

This is the result of our rigorous research and development philosophy. We test everything broadly, fail fast, and keep only the absolute best 1% that meets our extreme standards.

We’ll be the first to say that the Marshall Bromley 750 looks very stylish. Clearly referencing the brand’s signature amp design, “they’ve doubled down on what’s made them recognizable since the ’60s.” Leather details and the matte black & brass finishes definitely give the speaker a rock and roll feel.

On the flipside, we’re also insanely proud of the Soundboks 4’s iconic Danish design: the silicone-ball corners and steel grill look the part in any setting. Based on looks alone, it really comes down to personal preference.

Style is obviously an important factor when comparing speakers. But when it comes to the designs’ durability and performance, there are some obvious differences. This is particularly true if you’re looking for an outdoor party speaker.

Firstly, the Soundboks 4’s cabinet and bass port make the speaker sound even better by vibrating with the music. This adds an extra bit of organic oomph (a technical term, of course), creating a rounder, fuller sound. Conversely, the Bromley 750’s “closed-box design ensures a tighter, more controlled, and natural sounding bass.”

Secondly, we go above and beyond to test durability. This meant creating our own methods and processes. ‘Good enough’ was never the aim–we were only satisfied with perfection. Want to stand or dance on your Soundboks 4? Go ahead. Real party durability is built into our speakers.

While Marshall’s leather looks good on stage and poses well in photos, the Soundboks 4 is designed for real-life chaos. After all, the original speaker was built specifically for a festival campsite. We’ve heard stories of our speakers surviving campsite floods, car crashes, and a tornado. If you’re looking for an outdoor party speaker, the choice is clear.

7.8 kgs (16.5 lbs). That’s the weight difference between the lighter Soundboks 4 and heavier Marshall Bromley 750. To put that into context, that’s the equivalent of an average 6 month old child, your typical airplane carry-on luggage, or an 8 kg dumbbell (shock).

To compensate for their speaker’s bulky frame, Marshall added in-built wheels and a telescopic handle. In theory, this allows you to easily transport your speaker around. On solid ground, sure. Moving the speaker around the house or into your backyard is made far easier. But when it comes to less stable terrain, we don’t buy it. Festival campsites and beach parties don’t sound too compatible.

In contrast, we designed the Soundboks 4 with steel handles and to be compatible with The Backpack. The steel handles make it easy to carry with the help of a friend or even by yourself. Though sold separately, the ergonomic Backpack is the simpler solution. By no means is our party speaker light–who would we be kidding?! But these two options do make moving from A to B simpler at least.

Connecting wirelessly to either party speaker is simple. Soundboks 4’s Bluetooth 5.0 (with impressive range) and the Bromley 750’s Auracast offer quick, latency-free connection from your device.

Both speakers give you total control directly from dedicated apps; adjusting your tunes from anywhere in the party is made easy. In the Soundboks app, you can create custom sound profiles, adjust EQs, and lock your speaker. The Bromley 750’s front panel allows you to manually shape your sound and add effects such as reverb.

When it comes to linking multiple speakers together, the Soundboks 4 has an advantage. TeamUp technology allows you to wirelessly link up to five Soundboks–Soundboks Go and Soundboks 3 included–together. To link up multiple Marshall Bromley 750s, you must daisy-chain them via the AUX IN and AUX OUT ports using cables.

Both the Soundboks 4 and Marshall Bromley 750 offer solid pro inputs. Their XLR, 1/4", and 3.5 mm jacks allow you to connect mixers, microphones, instruments, and more directly into the speaker. This is done via the Soundboks 4’s ProPanel or the Bromley 750’s Input Panel. That being said, if you want to use your electric guitar with the Marshall, you need to use a preamp or pedal before connecting.

The Marshall Bromley 750 has integrated stage lights built into the speaker. These LED lights synchronize and have three stage-inspired presets, allowing you to adjust them to the vibe. However, they are fixed inside the speaker and point in one direction. Compared to a lot of other Bluetooth party speakers, these are pretty tasteful.

While the Soundboks 4 doesn’t have any in-built lights, we do have Lightboks–a first-of-its-kind audio reactive party light. With 10 curated color palettes and three energy modes, it is even more customizable than the Bromley 750’s offering. For those who want to have serious lighting at their parties, it’s worth spending the extra money.

Talking of customizing–the Soundboks 4’s grill pops off in seconds. This makes it super simple to clean and transforms it into a blank canvas for you to add your own artistic touch. If you prefer a flashy design that isn’t personal, this limited edition Studio 900 Combo Lunar New Year Edition 2026 might be more your thing.

• Marshall is known for guitar amps and lifestyle audio while SOUNDBOKS have always focused on party speakers and party lights
  
• Price: a Soundboks 4 costs €999; a Marshall Bromley 750 is €999
  
• Max volume: Soundboks 4 goes to 126 dB; the Marshall Bromley 750 maxes out at 127 dB
  
• Weight: Soundboks 4 weighs 16.1 kg (35.5 lbs); the Marshall Bromley 750 weighs 23.9 kg (52.7 lbs)
  
• Battery life at mid volume: Soundboks 4 lasts up to 40 hours; the Marshall Bromley 750 lasts up to 40 hours
  
• Durability: Soundboks 4 is built to survive festivals, outdoors, and real party chaos; the Marshall Bromley 750 is better suited for indoor scenarios
  
  Multi-speaker: Soundboks 4 links up to 5 speakers via TeamUp; the Marshall Bromley 750 can link multiple speakers via cabled daisy chain
  
  You can read more information and buy your Soundboks 4 via our website.