The Marshall Kilburn III is the third generation of a popular mid-sized speaker from the revered British amplification company. It features visual appointments that draw from Marshall's rock 'n' roll lineage, including tolex construction, brass cap knobs, and the classic white script logo in the center of the speaker grille. Boasting an IP54 rating, LC3/Auracast compatibility, and what the manufacturer calls 'True Stereophonic' tech for a 360-degree sound, the feature set seems to indicate this speaker has the substance to complement its distinctive style.
Our Verdict
The Marshall Kilburn III is a good speaker for music. It has a warm default sound with plenty of high bass and low mids. Many listeners may enjoy that full sound, though voices can sound a bit muddy since the treble is relatively quiet by comparison. If you're not a fan of the default sound, you can use the in-app EQ or bass/treble knobs to tailor it to your liking, and there's even a placement correction feature to optimize it for your environment. Its great directivity is a high point, ensuring consistent audio delivery across a range of listening angles. It also gets decently loud, though compression in the bass range at higher volumes can rob sounds like kick drums of a little punch.
Plays back stereo content with great directivity.
Graphic EQ, presets and placement correction in app.
Some compression at max volume.
The Marshall Kilburn III is an okay choice for soundtracking videos and movies. Latency with both Android and iOS devices is relatively low, so you likely won't experience any AV desync issues if you pair it to your phone. Its warm, mid-focused sound makes it a versatile companion to most video content, though it's better suited to dialogue-driven TV shows than action-packed blockbusters due to its lack of low-bass extension. Still, it can get loud enough to fill a medium-sized room, if needed, and the impressive directivity means everyone in the audience will experience similar audio delivery.
Plays back stereo content with great directivity.
Graphic EQ, presets and placement correction in app.
Some compression at max volume.
LC3/Auracast compatibility can still be spotty.
The Marshall Kilburn III is a very good choice for podcasts. Its mid-range-focused sound really helps bring out your favorite podcast hosts' voices, though they can sound a bit muddy due to its warm sound and relatively quiet treble. It can get loud enough for the conversation to carry in larger rooms. Transporting it from place to place is a breeze thanks to its portable design and built-in carrying strap. Plus, the speaker's great directivity means you don't have to worry too much about how you orient yourself around it: you'll be able to follow the narrative from all angles.
Long, 23-hour battery life.
Lightweight, portable design.
Some compression at max volume.
The Marshall Kilburn III lacks a built-in mic and voice assistant capabilities.
The Marshall Kilburn III is a great outdoor speaker. It's well-constructed from quality materials, and its portable design and comfortable carrying handle make it easy to take on the go. While its battery life doesn't meet the manufacturer's advertised figure of 50+ hours, we measured a little over 23 hours, which is still very respectable. It's likely you'll get closer to the advertised figure by listening at lower volumes. The IP54 rating means you won't need to baby it too much on camping trips, though it's best to keep it away from bodies of water. Its impressive directivity and warm sound mean everyone will experience similar audio quality, regardless of where they're positioned.
Long, 23-hour battery life.
Lightweight, portable design.
Some compression at max volume.
Changelog
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Updated Jul 29, 2026:
We've updated this review's text to reflect the new Test Bench 1.0.1 results.
- Updated Jul 28, 2026: This review has been updated to Test Bench 1.0.1. This includes the Test Bench 1.0 updates to all of our Sound tests: Frequency Response Accuracy, Raw Frequency Response, Directivity, and Loudness, as well as the revised Low-Frequency Extension calculation and related DRC updates introduced in Test Bench 1.0.1. There have also been text changes throughout the review, including to the usages and product comparisons, where applicable, to match these results. You can read more about these changes in our Test Bench 1.0 changelog and Test Bench 1.0.1 changelog.
- Updated Jul 13, 2026: This review has been updated to Test Bench 1.0, which includes new results for all of our Sound tests: Frequency Response Accuracy, Raw Frequency Response, Directivity, and Loudness. There have also been text changes made throughout the review, including to the usages and product comparisons, to match these results. You can read more about these changes in our changelog.
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Updated Dec 09, 2025:
The Portability box was corrected to state that the power source is a battery and USB. We retested the speaker at low volumes in response to user comments about the high noise floor, and added text to the Frequency Response Accuracy section.
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Differences Between Sizes And Variants
The Marshall Kilburn III comes in two different color variants: 'Black and Brass' and 'Cream' (here's a picture of its label). We tested the 'Black and Brass' variant, but expect other color variants to perform similarly. If you encounter another variant of this speaker, please let us know in the comments.
Popular Speaker Comparisons
The Marshall Kilburn III is the next generation of the Marshall Kilburn II. There are some notable upgrades from the previous iteration: the Ingress rating has been bumped from IPX2 to IP54, adding dust protection and resistance to water splashes. Although we haven't tested the Kilburn II, the manufacturer advertises that the battery life has more than doubled with the Kilburn III. If you're a fan of the classic Marshall livery and want something that can go up to 11, it's worth checking out the Marshall Woburn III, too. While this speaker needs to be plugged in to function, it makes up for this with a much louder max volume. That said, its directivity isn't as good as the Kilburn III, and its hefty frame means it's not a portable option. If you're not a fan of the Marshall speaker's nostalgic aesthetic, you can also check out the Bose SoundLink Max. It's similarly portable but features an IP67 rating and more robust wireless connectivity options.
See also our recommendations for the best portable Bluetooth speakers, the best Bluetooth speakers for bass, and the loudest Bluetooth speakers.
The Marshall Kilburn III and the Bose SoundLink Max are both great portable Bluetooth speakers, but there are slight differences that can influence your buying decision. The Bose is sturdier, boasting an IP67 rating for submersion in water. It has a better app, too, which lets you pair other SoundLink Max speakers in stereo or party mode without using Auracast. That said, the Marshall has better directivity and a longer battery life that stretches close to 24 hours.
Whether you should choose the Marshall Kilburn III or the Marshall Middleton II depends on your primary usage. The Kilburn III has a longer battery life and offers room correction in addition to EQ tools. Although well built, it's not as portable as the Middleton II, which is smaller with a higher IP67 rating. The Middleton II also has a mic for taking phone calls. You can EQ it to taste, but keep in mind that it has a slightly lower max output. Still, it fits more easily into a backpack for on-the-go.
The Marshall Woburn III is a great alternative to the Marshall Kilburn III if you're looking for a speaker to park in one place and value audio fidelity. While it's entirely mains powered, it makes up for it with a loud max volume. That said, the Kilburn III is a better choice if you value on-the-go use, as it's highly portable and offers almost 24 hours of battery life. It also has better directivity, so you enjoy the sound equally well from different listening angles.
The Marshall Emberton II is more portable than the Marshall Kilburn III, which will likely be its main selling point. It's extremely easy to sling into a backpack or tote bag. It also offers better directivity and extremely low latency on iOS and Android devices, which is great if you need an impromptu audio accompaniment for a YouTube video. When it comes to sound, the larger Kilburn III is a more enticing proposition. It can get louder without compressing as much at max volume. It also has a marginally longer battery life, which can come in handy for long camping trips.
Test Results
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