Introduction

Kerr Acoustic has announced the new K400 compact loudspeaker, which employs Jes Kerr’s proprietary transmission-line loading.  The K400 can be wall- or ceiling-mounted, a first from Kerr Acoustics. The K400 is well-suited to Dolby Atmos and other AV solutions, as well as smaller room audiophile systems.

Kerr Acoustic K400 compact loudspeaker

The two-way loudspeaker uses a 150mm Scanspeak mid-bass unit paired with a 45mm true-ribbon tweeter in a 24mm Baltic birch plywood baffle with 18mm BBP sides, top and bottom.  There is 12mm internal bracing.

Designer Jes Kerr says;

It takes many of the same ingredients and design philosophy that make our K300 so special, and presents them in a more compact format that opens them up to users seeking a more compact loudspeaker. Due to its size, it’s also ideal for Dolby Atmos and other surround installations.

He adds;

“We’ve been using Scanspeak’s 180mm Revelator driver in our K300 and K320 for some time, and found its performance to be incredibly hard to beat. Incorporating the smaller version into the K400 was a natural step.

Kerr Acoustic K400 compact loudspeaker on £595 (pair) stand

Specification and Price

Kerr Acoustic K400 compact loudspeaker

Construction 24, 18mm & 12mm Baltic birch plywood transmission-line

Driver Low/mid: 150mm high-performance Scanspeak driver

High: 45mm true ribbon tweeter

Crossover 6-element 1.95 kHz 2nd order (12dB/octave) featuring premium film capacitors from Clarity Cap, hand-wound high-purity copper air-core inductors, and carbon film resistors.

Connections: One pair of 4mm copper 5-way binding posts

Response 39Hz – 45kHz

Sensitivity 88dB (2.83V/1m)

Impedance 6 Ohms (nominal)

Dimensions 341mm height | 164mm width | 310mm depth

Weight 7.5kg (per cabinet)

Kerr Acoustic’s new K400 loudspeaker will be available to pre-order from 8th May 2026, in a range of real wood veneers — including oak and walnut— or in a satin or high-gloss lacquer in any RAL colour. Supplied with magnetic grilles as standard. Custom stands available separately. Prices as follows (inc. VAT):

Real wood veneer £4,695
Satin lacquer £4,925
High gloss lacquer £5,125
High gloss veneer £5,345
K400 stands (per pair) £595

Kerr Acoustic K400 compact loudspeaker, their most ‘home-friendly’ - professional monitor to date
Kerr Acoustic K400 compact loudspeaker rear with four professional grade M8 mounting points on the rear panel

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