Marshall Kilburn III Black and Brass Portable Speaker

Portable Bluetooth Speaker with Marshall's Signature Touch

The Marshall Kilburn III Black and Brass portable Bluetooth speaker pairs 50W of audio muscle with a classic retro design. Created in Sweden, this model fills any room with immersive 360° True Stereophonic sound, ensuring there are no dead zones no matter your position. Representing the third generation in Marshall's portable lineup, the Kilburn III Black and Brass arrives with USB-C connectivity, Auracast, and improved acoustic tuning to rival the brand's premium home speakers.

True Stereophonic Sound and Dynamic Loudness

What stands out is the True Stereophonic architecture: stereo drivers and enhanced tuning that radiate sound in every direction. Thanks to Dynamic Loudness technology, bass, mids, and treble stay balanced whether you’re listening quietly or entertaining outdoors. The tactile analog controls for bass, treble, and volume—complete with LED indicators—offer hands-on adjustment, bypassing app menus.

Technical Specifications

• Power Output: 50W total (30W Class D amplifier for woofer + 2×10W Class D amplifiers for full-range drivers) — delivers room-filling sound with clean headroom
• One 4-inch woofer plus two 2-inch full-range speakers in a bass reflex cabinet produce punchy bass down to 45 Hz.
• Battery Life: 50+ hours playtime, rechargeable Li-ion battery — quick charge gives 8 hours from just 20 minutes on a 30W USB-C PD charger
• Wireless Connectivity: Bluetooth 5.3 with Auracast, Multipoint pairing, SBC/AAC/LC3 codecs — connect two devices simultaneously with high-quality audio transmission
• Frequency Response: 45 Hz - 20 kHz — full-range reproduction from sub-bass to sparkling highs
• Maximum SPL: 91 dB at 1 meter — loud enough for parties and outdoor gatherings
• Protection Rating: IP54 dust and water resistant — handles splashes, light rain, and dusty environments
• Dimensions and Weight: 273 × 150 × 169 mm, 2.8 kg — portable with integrated carrying strap
• Inputs and Outputs: 3.5mm AUX input, USB-C (charging and power bank output) — charge your phone from the speaker's battery
• Tactile bass, treble, and volume knobs with LED indicators, plus a dedicated Bluetooth pairing button, keep controls at your fingertips.

Who Should Consider This Speaker

Marshall Kilburn III Black and Brass is made for those who value both sound quality and design. Its place is equally on your mantel, office desk, or patio—anywhere standout audio and style matter. For listeners frustrated by plastic-sounding portable speakers, this model offers real depth and craftsmanship that echo Marshall’s amplifier legacy. The battery runs for over 50 hours and the IP54 rating means it works for extended outdoor use, while the USB-C power bank keeps your phone alive away from outlets.

Carrying on the Marshall Legacy

Marshall has shaped the world of amplification since 1962, and the Kilburn III brings this expertise to portable sound. The Black and Brass colorway nods to classic Marshall stage gear, while features like Auracast, Bluetooth 5.3 Multipoint, and the companion app ensure seamless use in modern wireless setups. Built in Sweden and assembled in Thailand, this model uses 38% recycled materials for responsible audio performance.