Marshall Marshall
Marshall Bluetooth Water Resistant Portable Speaker KILBURNIIIBLK
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Marshall Bluetooth Water Resistant Portable Speaker KILBURNIIIBLK

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Turn heads and ears with the impeccable audio and timeless design of Kilburn III by Marshall. 360° True Stereophonic sound keeps the music hitting all the right notes from wherever you’re standing. No wonder it’s got such an obsessive following.

Three Amps, 50 Watts, True 360-Degree Stereo

The Kilburn III packs three Class D amplifiers under the hood: a 30W amp driving a front-facing 4-inch woofer, and two 10W amps powering a pair of angled tweeters on the left and right. Total output is 50 watts. The frequency response stretches from 45 Hz to 20 kHz, which means actual low-end thump, not the tinny approximation most portable speakers call bass.

Marshall calls it "True Stereophonic" sound, and it's earned. The angled tweeters create a wide stereo image that holds up whether you're sitting in front of the speaker or off to the side. At a BBQ, you don't need to point it at the crowd. Everyone gets the full mix. Max SPL sits at 91 dB at one meter, which is loud enough to fill a decent-sized backyard without distortion kicking in.

50 Hours of Battery and You Can Replace It Yourself

Fifty hours. That's not a typo. The Kilburn III more than doubled the battery life of its predecessor, which topped out around 20 hours. At moderate volume, you can run this speaker for an entire work week without plugging it in. Quick charge via USB-C gives you 8 hours of playback from just 20 minutes on a 30W PD charger. Full recharge takes about 3 hours.

The real move is the replaceable battery. When lithium-ion cells inevitably degrade after a couple of years, you don't toss the speaker. You swap the battery. Marshall designed the cell to be user-replaceable, which is becoming rare in consumer electronics and a genuine reason to pick this over competitors that force you to buy new hardware when the battery fades.

Analog Controls on a Gold Top Panel

The top panel is brushed metallic gold with three knurled knobs for volume, bass, and treble, plus physical buttons and toggle switches for power, Bluetooth, and media control. It looks and feels like the control panel on a Marshall amplifier head, which is the whole point. You reach over and twist a knob instead of opening an app on your phone.

Bass and treble controls are genuinely useful. Rolling the bass knob up fills a room with low end. Pulling it back tightens things up for acoustic or vocal-heavy music. The Marshall Bluetooth app gives you more control if you want it, but the speaker sounds great right out of the box with the physical EQ. There's also an AUX 3.5mm input for wired sources.

IP54, Auracast, and a Built-in Power Bank

The Kilburn III is rated IP54, meaning it handles dust and splashing water from any direction. It's not fully submersible like the Willen II, but it's ready for a patio in a rainstorm, a beach picnic, or a dusty campsite without worry. At 2.49 kg (about 5.5 lbs), it's portable enough for day trips with the integrated carry strap.

Bluetooth 5.3 with multipoint lets you connect two devices simultaneously. Auracast support means future compatibility with broadcast audio sharing. And here's a nice touch: the USB-C port doubles as a power bank. Your phone dying at a festival? Plug it into the Kilburn III and keep the music going while your phone charges. Battery preservation mode extends the lifespan when the speaker stays plugged in for long periods.

Features

🔊

50W / Three Class D Amps

A 30W amp drives the 4-inch woofer, two 10W amps power angled tweeters. 360-degree True Stereophonic sound with 45 Hz to 20 kHz frequency response and 91 dB max SPL.

🔋

50+ Hours / Replaceable Battery

Over 50 hours on a single charge. 20-minute quick charge gives 8 hours back. And when the battery degrades years from now, swap it yourself instead of buying a new speaker.

🎛

Analog Bass & Treble Knobs

Three knurled knobs on a brushed gold panel for volume, bass, and treble. Physical controls that feel like a Marshall amp. Tweak the EQ without touching your phone.

💧

IP54 Water & Dust Resistant

Handles rain, splashes, and dusty environments. Built for patios, beaches, and campsites. Carry strap included for day-trip portability at 2.49 kg.

🔌

USB-C Power Bank

Charge your phone from the speaker's USB-C port. With 50+ hours of battery, the Kilburn III can share power without running dry. Battery preservation mode for extended plug-in use.

📶

Bluetooth 5.3 / Auracast

Multipoint pairs two devices at once. Auracast-ready for future broadcast audio sharing. 10-meter range, SBC/LC3/AAC codec support, and 3.5mm AUX backup.

Who Is This For?

The Backyard Host

You're the one who throws the BBQs, the birthday parties, the late-summer bonfires. The Kilburn III fills a backyard with 50 watts of proper stereo sound from any angle. Analog bass and treble knobs let you dial in the vibe without fiddling with an app. And 50+ hours of battery means it'll outlast the party, the after-party, and the cleanup.

The Road Tripper

Cabin weekends, camping trips, cottage season. You need a speaker that survives dust, rain, and two days without a power outlet. The Kilburn III checks every box: IP54 for weather, 50 hours of battery, quick charge that gives 8 hours from a 20-minute plug-in, and a USB-C port that doubles as a phone charger when you're off-grid. The carry strap makes it easy to bring along at under 5.5 lbs.

The Analog Audio Fan

You miss physical controls. Volume apps and touch sliders aren't your thing. The Kilburn III puts three real knobs on a brushed gold panel: volume, bass, treble. It looks like a Marshall amp head, sounds like one too, and the replaceable battery means you're not throwing it out in three years. It's the kind of speaker you keep for a long time.

Specifications

General
Series Kilburn
Power Output 30 W
Frequency Response (Hz) 45Hz – 20KHz
Bluetooth Yes
Wi-Fi Yes
Weatherproof Rating IP54 - Water/Dust Resistant
Color Black
Manufacturer Color Black
Battery Life 50 h
Supplied Accessories Box Contents: Speaker, USB-C to USB-C charging cable, Quick start guide, Legal and safety information
Drivers
One 4 inches Woofer
Two 2 inches Full-range Speakers
Power Source
Battery Type Rechargeable, replaceable, Li-ion battery
Power Input USB-C 9V/3A, 5V/3A
Additional Information
Colorways Black and Brass
Stereo/Mono Stereo
Maximum Sound Pressure Level 91 dB SPL @ 1 m
Cabinet Principle Active stereo loudspeaker with bass reflex system
One 30 Watt Class D Amplifier for the Woofer
Two 10 Watt Class D Amplifiers for the Full Ranges
Wireless Connectivity Bluetooth 5.3
Auracast
Wired Connectivity AUX 3.5 mm
Bluetooth Range 10m, 32.8ft
Top Panel Controls Bass
Top Panel Controls Treble
Top Panel Controls Volume
Top Panel Controls On/off
Top Panel Controls Media jog
Top Panel Controls M-button
Top Panel Controls Bluetooth button
Codecs SBC, LC3, MPEG-2 AAC
Bluetooth Multipoint Connectivity
Materials 38% of the total product is recycled
Battery Preservation
Quick Charging
20 minutes of charge time gives 8 hours of playtime with a 30W USB-C PD charger
Charging Time 3 hours to full recharge with a 30W USB-C PD Charger
Apps Marshall Bluetooth app
Inputs/Outputs
USB Yes
Auxiliary Input 1
Dimensions
Width 10.75 inch(es) / 27.3 cm
Height 6.65 inch(es) / 16.9 cm
Depth 5.91 inch(es) / 15 cm
Weight 5.49 lb(s) / 2.49 kg
Warranty
Warranty 1 year

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