Marshall’s Kilburn III arrives as the company’s most capable portable Bluetooth speaker to date, priced at $380 (currently available at Amazon for $336 and Best Buy for $340), with a slate of hardware upgrades that go well beyond cosmetic changes.
The speaker carries forward Marshall’s signature aesthetic — faux leather cabinet, oversized control knobs, and the familiar script logo — while introducing meaningful functional improvements over the second-generation Kilburn. The combination makes a strong case for anyone shopping in the midsized portable speaker market.
Built Like Gear, Not a Gadget
The most immediately noticeable addition is the power switch. Where the Kilburn II used a combined power-and-volume knob, the third generation replaces it with a spring-loaded, knurled metal lever. It serves no acoustic purpose, but it is tactilely satisfying and visually distinctive.
A playback control has also been added — something the Kilburn II notably lacked. It operates as a rocker switch for track skipping, with a downward press to play or pause. Both controls work confidently without looking at them.
Weather resistance has improved as well. The Kilburn III carries an IP54 rating, a step up from the IPX2 protection on its predecessor. Rain and sand are manageable; submersion is not. The speaker ships with a removable red velour-lined carry strap and a 6.5-foot USB-C charging cable, though no wall adapter is included in the box.
Bigger, But Still Easy to Carry
At 10.7 x 5.9 x 6.6 inches and 6.17 pounds, the Kilburn III is roughly an inch larger in each dimension and about half a pound heavier than its predecessor. That puts it at the same weight as the Sonos Move 2, though the carry strap gives it a practical portability advantage over the Move 2’s integrated rear handhold.
The acoustic configuration has changed too. Marshall’s “True Stereophonic” design retains a dedicated woofer, but swaps the Kilburn II’s tweeters for dual full-range drivers.
Battery Life Is the Real Story
Output has climbed from 36 watts to 50 watts, yet Marshall claims over 50 hours of playtime from the internal battery, more than double the Kilburn II’s 20-hour rating. The efficiency gains are striking given that the battery itself grew only modestly, from a 5,200 mAh cell to a 5,500 mAh cell — roughly a 5 percent increase in capacity.
The Kilburn III can also charge external devices via its USB-C port. The direction of current flow depends on the speaker’s state: power on sends charge outward to connected devices; power off reverses that, drawing from whatever is plugged in. Users who connect a phone while the speaker is switched off should expect the phone to discharge rather than charge.
The Marshall app offers battery preservation options, including capping the maximum charge at 90 percent and adjusting charging speed, aimed at extending the long-term health of the internal cell.
Where It Falls Short
- No stereo pairing with a second unit
- No wall adapter included despite the $380 retail price
Those gaps are real, particularly the absence of stereo pairing at this price point. The Kilburn III earns a rating of 8 out of 10, a score that reflects how much Marshall has improved the product while acknowledging the features it still does not offer.
Photo by Annie Spratt on Unsplash
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