Marshall Kilburn III Portable Bluetooth Speaker

Iconic Power & Endless Playtime: Marshall Kilburn III Portable Bluetooth Speaker

Command the room—and the outdoors—with the legendary Marshall Kilburn III Portable Bluetooth Speaker , the ultimate evolution of Marshall’s hero portable amplifier. Pushing an impressive 50W of total output power driven by three dedicated Class-D amplifiers (a 30W woofer and dual 10W full-range drivers), this powerhouse delivers a robust frequency response dipping as low as 45Hz. Featuring Marshall’s signature 360-degree True Stereophonic sound , the Kilburn III ensures immersive, multi-directional audio with no blind spots, filling any space with deep, punchy bass, rich mids, and crystal-clear highs.

Engineered for life on the road and around the home, the speaker features a rugged IP54 water- and dust-resistant build wrapped in Marshall’s unmistakable rock ‘n’ roll aesthetic—complete with textured vinyl, a brassy control plate, and a tactile analog top panel. Breaking boundaries with over 50 hours of portable playtime on a single charge, it ensures your music never stops. Equipped with next-gen Bluetooth 5.3 with Auracast™ support for effortless multi-speaker broadcasting, Dynamic Loudness for balanced sound at any volume, multipoint pairing, and a USB-C power-bank feature to charge your phone on the go, the Kilburn III is built to perform.

Professional Studio Features

• 360° True Stereophonic Sound: Multi-directional acoustic layout engineered to deliver balanced, immersive sound from any angle without blind spots.

• 50W Total Power Output: Powered by a 30W Class-D amplifier for the 4-inch woofer and dual 10W amplifiers for the full-range drivers.

• 50+ Hours of Portable Playtime: Massive battery life keeping your playlists running for days, supported by rapid USB-C charging.

• IP54 Dust & Water Resistance: Durable housing designed to easily shrug off accidental splashes, dust, and outdoor elements.

• Auracast™ Broadcast Technology: Stream audio seamlessly to other nearby Auracast-compatible speakers without complex pairing steps.

• Dynamic Loudness: Automatically optimizes tonal balance so your music stays rich, detailed, and punchy at both high and low volumes.

• Tactile Analog & App Controls: Fine-tune your sound using physical brass knobs for volume, bass, and treble, or remotely via the Marshall Bluetooth app.

• Built-In Power Bank: Use the speaker’s USB-C port to plug in and charge your smartphone or mobile device on the fly.

💡 Pro-Tip: Use the physical top-panel analog bass and treble knobs to quickly tailor your mix on the fly, or jump into the Marshall Bluetooth app to toggle EQ presets and battery preservation modes.

Technical Engineering & Specifications

Marshall Kilburn III Portable Bluetooth Speaker Frequently Asked Questions

Q: How long does the battery last, and can it charge my phone?

A: The Kilburn III delivers an incredible 50+ hours of portable playtime on a single charge. It also features a built-in power bank function, allowing you to plug your smartphone directly into the speaker’s USB-C port to charge on the go.

Q: What is Auracast, and how does it work?

A: Auracast is next-generation Bluetooth technology built into the Kilburn III that lets you broadcast audio to other nearby Auracast-compatible speakers simultaneously without manual pairing hurdles.

Q: Can I connect the speaker using a wired cable?

A: Yes! In addition to advanced wireless Bluetooth 5.3 connectivity, the speaker includes a traditional 3.5mm AUX input on the control panel for wired playback sources.