Marshall Bromley 750 review: the party speaker that challenges the JBL PartyBoxes

Marshall, a well-known manufacturer in the portable Bluetooth speaker segment, has taken the XXL step with its first party speaker. The Bromley (a town in the south of the UK) tops the range of wireless models from the British brand. With a colossal 500 watts of amplification power, a long battery life of 40 hours, light effects and a rich array of connectors, this speaker promises to make your parties wild. Priced at €999, can it compete with the JBL PartyBox, the benchmark in the field of powerful party speakers?

Introducing the Marshall Bromley 750

The iconic Marshall design

No matter what terrain Marshall ventures into, the brand always manages to distinguish itself through a clearly identifiable aesthetic. The Marshall Bromley 750 features the brushed aluminum knobs, metal grille and rubber finish that give the brand its special charm. In a more vertical format, this model follows the lines of the manufacturer’s legendary guitar amplifiers. Unlike the JBL PartyBox and Sony ULT Tower 10 party speakers, the Marshall Bromley 750 asserts its rock’n’roll character. This 2025 party speaker is made to be seen and, above all, heard.

Transportable despite its 24kg weight, it features a suitcase-style telescopic handle and sturdy rubber wheels. This detail immediately reassures us of its sturdiness. The quality of finish and craftsmanship is beyond reproach, from the synthetic leather to the metal acoustic grilles. Two sturdy folding metal handles on the sides also make it possible to carry the Marshall Bromley 750 up and down stairs, alone with help.

What’s more, the integration of a screw thread for a universal PA tripod on the underside of the speaker also makes it ideal for concerts in public places or associations. The Marshall Bromley 750 is then decoupled from the floor, allowing its high sound power and 360° diffusion to be fully harnessed. This makes it ideal for use in the center of a beer garden, or in a large outsdoor space at a reception.

Robustness and autonomy

IP54-rated, this large-format Bluetooth speaker won’t be affected by guests’ drinks on the dance floor, or the first drops of rain when installed on the patio. The connectors, battery and power port are concealed behind waterproof rubber covers. As for the dense wooden structure, it limits resonance and guarantees resistance to the knocks and bumps that can punctuate festive moments. For added stability, the Bromley 750 rests on four non-slip silicone pads that grip the floor perfectly. What’s more, the corners are reinforced to prevent damage.

As the Marshall Bromley 750 can be taken from room to room, and even outdoors, it comes with a rechargeable battery offering 40 hours of autonomy. It’s currently the longest-running party speaker on the market! This means you can look forward to a party that lasts until the early hours of the morning. What’s more, the battery is removable, so it can be replaced if it shows signs of fatigue in a few years’ time. This makes it easier to recharge the speaker without having to move its 24kg. Marshall’s commitment to sustainable design is in line with the spirit of the times.

📒 Note from the expert
The Marshall Bromley 750 party speaker's battery doubles up as a powerbank. The powered USB-C port on the rear of the speaker can be used to recharge a smartphone. This is very practical for a party out on the patio or in the garage when there's no electrical outlet nearby. This feature also ensures that a Bluetooth source is always charged, so you can enjoy your playlists. This removable battery can even be taken out of the Bromley 750 and placed on a high piece of furniture, safe from knocks and the hustle and bustle of a party, to recharge a smartphone while the speaker (plugged into the mains) continues to play music.The speaker's battery has a USB-C port for charging or powering an external device.     

Colossal power and 360° sound diffusion

The Marshall Bromley 750 party speaker sets new standards. It features no fewer than eight drivers, with a total amplification system of 500 watts and 128 dB SPL, worthy of a real rock concert. Its generous size accommodates two 10 inch bass drivers, each powered by a 150-watt amplifier module. They are backed up by 5 inch midrange drivers ideally placed on either side, above the handles, and four tweeters, two of which face upwards.

This True Stereophonic acoustic architecture ensures true 360° sound diffusion, enabling everyone to enjoy the music to the full, whatever their position around the Bromley 750. This audio design facilitates the speaker’s placement and ensures uniform sound perception for all guests. Each driver is perfectly protected by a metal acoustic grille.

Bluetooth and connectors

The Marshall Bromley 750 party speaker features a Bluetooth 5.3 module, Multipoint and Google Fast Pair compatible, supporting SBC, AAC and LC3 codecs. It’s a pity that the British brand hasn’t included the aptX codec, which optimizes the wireless transmission rate. In addition to Bluetooth, the speaker also boasts a comprehensive range of connectors, making it a true semi-professional model.

Indeed, the Marshall Bromley 750 adopts a powered USB-C audio port for recharging a smartphone. This input also optimizes playback of HD audio files stored on a computer, for example. Stereo RCA and auxiliary inputs are also provided, for connecting a vinyl system or CD player. A 3.5mm mini-jack auxiliary output is intended for the device’s stereo system. Unfortunately, wireless daisy-chaining is not available on the Marshall Bromley 750 speaker.

In addition, two XLR / 6.35mm jack combo inputs, switchable between a microphone and an instrument, enable wired connection of a microphone and/or electric guitar, for example. With its rich connectivity, this XXL-format speaker can be used by a small band (guitar+vocals) wishing to perform occasionally.

Physical controls and app

As mentioned earlier, the brushed aluminum knobs, identical to those on Marshall guitar amps, reinforce the speaker’s vintage aesthetic and high-quality finish. The front panel also features a power button, an audio source selector, a light effect selector, a play/pause button for playlist navigation, and 7 knobs for sound modulation.

Here we find the usual Marshall knobs for volume, as well as bass and treble gain control. Next to them are potentiometers for individual adjustment of mic/instrument input volume and effects (echo and reverb). Finally, on the right-hand side of the control panel, the Sound Character function, used in conjunction with the volume knob, allows you to fine-tune the control and intensity of the sound by modifying the signal’s equalization curve, compression and harmonics. The Dynamic mode renders the sound naturally, while the Loud mode offers a bolder sound, with more bass, an effect often sought after to liven up the dance floor. A final button lets you select one of the three light modes, or deactivate them to conserve battery power.

For its part, the app is of little interest apart from volume control and precise assessment of the device’s battery level, even though the Bromley also features a graduated indicator on the front panel. Of course, it is possible to select the source remotely, but I regret that no equalization settings are accessible in this app. The same applies to the light effects: it is only possible to configure the M button, located in the center of the control panel, to assign it the Stroboscope or Low Volume Mode functions. However, once configured, the strobe effect can only be activated by pressing the button on the speaker, and only lasts for three seconds!

A wrong note
The M control setting is of little interest for the Stroboscope effect, which can only be activated by pressing the physical button on the speaker, and whose duration remains very short. The Low Volume Mode feature reduces the volume by 30 dB. This can be useful, for example, during a message on the microphone. The option can be activated and deactivated via the M button on the speaker. Too bad it can't also be remotely activated via the app.    

Marshall Bromley 750: key features

• Max. power: 500 watts
• Eight drivers, including 2 x 10″ and 2 x 5″
• Bluetooth 5.3 (SBC, AAC, LC3)
• 40 hours of autonomy
• 3 integrated light effects
• USB-C audio, XLR / 6.35mm jack (guitar/mic), mini-jack and RCA inputs
• Dimensions (WxHxD): 413 x 652 x 335mm
• Weight: 23.9kg

My listening impressions

Marshall sound, in XXL format and at very high volume, up to 128 dB SPL. That’s what the Bromley 750 exudes from the very first listening session. The bass unfolds with ease, and is punchy. The sound is warm and fully customizable. This is first and foremost a party speaker, designed to liven up a dance floor. So it’s only natural that the low frequencies should be more prominent than the midrange and highs. For better musical balance, simply adjust the tone controls.

The placement of the vertical tweeters also makes sense when listening from Qobuz. They offer a pleasant sensation of height, especially for instruments. The British brand’s signature sound emphasizes the bass, but also seeks to give prominence to the high frequencies, offering a sound experience akin to that of a live concert.

Demonstrative and powerful, the Marshall Bromley 750 party speaker can be used in all kinds of spaces. It has so much reserve power that it can be installed outdoors or in a party hall. This versatility comes in very handy. In a 35m² living room, you don’t need to exceed 60 to 70% volume to fully appreciate the music and get people on the dance floor. To enhance the festive ambience, the light effects are also effective.

Marshall Bromley 750 compared to the JBL PartyBox 720

A benchmark in party speakers, the PartyBox models feature True Wireless Stereo (TWS) and Auracast wireless daisy-chaining, whereas Bromley simply has wired daisy-chaining. The JBL PartyBox 720 boasts 800 watts of amplification power, RGB light effects and a more comprehensive app. However, the Marshall model’s acoustic architecture is more ambitious, with eight drivers, a 3-way design that offers more detail and 360° sound diffusion. What’s more, the high-end build quality of the British model, with brushed aluminum, a wooden cabinet and synthetic leather covering, outshines the PartyBox 720’s 100% plastic design.

Who is the Marshall Bromley 750 designed for?

This versatile party speaker is designed for fans of powerful bass and house parties. The Marshall Bromley 750 is designed to liven up the dance floor, whether you’re with family or friends. Above all, it’s a beautiful object offering a perfect balance between sonic power and build quality. This party speaker stands out from its all-plastic competitors by integrating brushed aluminum and synthetic leather. It’s also an ideal alternative for listening to music at high volume, at 360°, without risking damage to a conventional hi-fi system. Easy to use, it’s just as suited to teenagers looking to party as it is to adults looking for a simple audio solution for one-off events. The speaker’s connectivity, including XLR microphone and instrument inputs, means it can also be considered a permanent member of a band that regularly performs in public places.

Frequently asked questions Marshall Bromley 750 – FAQ