The Marshall Bromley 750 is a large, battery-powered party speaker designed to deliver extremely loud sound. Its design leans heavily on Marshall's signature guitar amplifier aesthetic. In addition to Bluetooth playback, it offers extensive wired connectivity, including XLR inputs and daisy chaining, making it more versatile than most consumer speakers. It's priced to compete at the top end of the party speaker category, competing with other large party speakers from the likes of JBL.
Our Verdict
The Marshall Bromley 750 is good for listening to music. This large, heavy speaker gets loud enough to fill large rooms with your favorite tunes, and even at full blast, it barely compresses your audio at all. Kick drums come through with plenty of punch. That said, since the speaker doesn't reproduce much low-bass, fans of minimal techno's thumpy kick drums might wish for a little more rumble. Voices can also sound a touch thin, but some listeners will hear that as clarity. The amazing soundstage performance will please everyone: audio sounds very similar regardless of your listening angle. That means you can place this speaker wherever is most convenient without worrying too much about sound quality.
Sounds similar regardless of your listening angle.
Gets loud enough to fill large rooms and open spaces with sound.
Very little compression at max volume.
Lacks low-bass thump.
Very heavy and difficult to transport.
The Marshall Bromley 750 speaker is okay for videos and movies. It has decent frequency response accuracy, so most audio sounds fairly accurate. That said, voices can sound a touch thin, and there's little low-bass rumble, so explosion effects aren't very impactful. Still, the speaker gets loud enough to fill large spaces like garages with sound, and does so with very little compression. It also sounds similar regardless of your listening angle, so you can place it wherever is most convenient in your space without worrying too much about sound quality taking a big hit. Latency is also fairly low with both iOS and Android, so you shouldn't run into many lip-sync issues, although different apps and devices compensate for latency in different ways.
Sounds similar regardless of your listening angle.
Gets loud enough to fill large rooms and open spaces with sound.
Very little compression at max volume.
Lacks low-bass thump.
Very heavy and difficult to transport.
Voices can sound a bit thin.
The Marshall Bromley 750 is decent for listening to podcasts. It gets loud enough to fill even the largest living rooms with audio, so you'll always be able to hear your favorite host's voice. That is, unless you have to leave the room. This speaker is very heavy and impractical to carry from room to room. It's meant to soundtrack your party from a single location, not accompany you around your house as you tidy up before the big event. Still, since it supports multi-device pairing, you can easily switch between a couple of devices without an onerous Bluetooth re-pairing period.
Sounds similar regardless of your listening angle.
Gets loud enough to fill large rooms and open spaces with sound.
Lacks low-bass thump.
Very heavy and difficult to transport.
The Marshall Bromley 750 does not have a built-in microphone, so it doesn't support your phone's voice assistant.
The Marshall Bromley 750 is good for use outdoors. It gets loud enough to fill an area like a garden with sound, making it a good choice for soundtracking a summer BBQ party. And it sounds similar regardless of your listening angle, so you can position it wherever is most convenient. Its decent frequency response accuracy also means most genres of music are well-represented, though hip-hop fans might wish for a little more rumble in the low-bass. It has an 18-hour battery life and an IP54 rating, so you can get a few splashes of water on it without issue, though you wouldn't want to leave it outside in a downpour. The main downside to outdoor use is this speaker's size: it's large and heavy. So while it's great for that garden party, you can't easily take this speaker to the park or on a hike.
Sounds similar regardless of your listening angle.
IP54 rating means it can withstand splashes of water.
Gets loud enough to fill large rooms and open spaces with sound.
Lacks low-bass thump.
Very heavy and difficult to transport.
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Differences Between Sizes And Variants
The Marshall Bromley 750 comes in one colorway: 'Black and Brass'. Here's a picture of our unit's label.
If you encounter another variant of this speaker, let us know in the comments, and we'll update our review.
Popular Speaker Comparisons
The Marshall Bromley 750 sits at the high end of the portable party speaker category, both in terms of size and price. It's noticeably heavier than similarly sized speakers like the popular JBL PartyBox Stage 320, but it offers higher output volume, longer advertised battery life, and more extensive wired connectivity, including combo XLR/instrument inputs. At the other end of the size and weight range, the battery-powered Marshall is easier to transport than the Sony ULT TOWER 9AC. But the Sony gets louder and delivers more bass, though it compresses your audio a fair bit at max volume. The Sony version we tested also runs only on AC power. In terms of size and weight, the Marshall's closest rival might be the similarly-sized JBL PartyBox 520. The PartyBox 520 puts out more bass and gets louder than the Marshall, but has a shorter battery life and worse directivity.
If you're looking for more options, check out the best speakers for parties, the best karaoke speakers, and the best Bluetooth speakers.
Though from the same brand, the Marshall Woburn III and Marshall Bromley 750 target different audiences. The Woburn III is much smaller and lighter. In theory, that makes it easier to transport, but it doesn't have a built-in battery, so that's only a boon come moving time. On the other hand, the Bromley 750 offers 18 hours of battery life and an array of wired ports, including combo XLR/instrument inputs. The speakers have similar max volumes, though the Bromley has better directivity, so audio sounds fairly similar regardless of your listening angle.
The JBL PartyBox 1000 and Marshall Bromley 750 are both heavy, expensive, party-oriented speakers with an array of mic and guitar inputs. But they've different strengths. The much larger JBL produces more bass and can get louder than the Marshall. But the JBL is limited to AC power, whereas the Marshall can run for up to 18 hours of its built-in battery. The Marshall also plays back stereo audio without downmixing it to mono, and its sound doesn't change much with your listening angle. The JBL has forward-facing drivers, so your audio sounds muffled if you're behind it.
Unlike the battery-powered Marshall Bromley 750, the JBL PartyBox 710 only runs on A/C power. The JBL is also the larger and heavier speaker. If those aren't dealbreakers, the reward is a much fuller-sounding speaker with plenty of rumbly, deep bass on offer. On the other hand, if you need a slightly more portable option, the Marshall still puts out decently punchy bass. It also has amazing directivity, so your audio sounds quite similar regardless of your listening option. Both speakers have mic and instrument inputs, but only the Marshall has XLR inputs.
The Sony ULT TOWER 9AC is heavier and larger than the Marshall Bromley 750. Perhaps unsurprisingly, then, it puts out more low-end and gets louder. That said, the Sony compresses your audio much more at max volume than the Marshall. And even though the Sony has two tweeters facing rearward and is advertised to offer 360-degree sound, in practice, your listening angle still impacts the sound you hear. This is much less true with the Marshall, which sounds fairly similar regardless of your listening angle. The Marshall also runs on battery power, which might be the decisive factor if you plan to soundtrack a garden party BBQ using this speaker.
Test Results
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