03 / COINCIDENT SOUND

KEF Coda WInside Uni-Q.

Two drivers. One acoustic centre.
Explore the geometry behind KEF’s approach to stereo sound.

A coaxial loudspeaker driver with a quarter cut away, showing the tweeter dome at the centre of a silver midrange cone, the copper voice coils, magnets and the rear chamber in section. — The Uni-Q driver cut away: the tweeter dome sits in the throat of the midrange cone, so both radiate from one point. The internals are illustrative, not KEF's drawings.

Loading the 3D model…

My model of Coda W · Midnight Blue finishDrag to orbit · + / − to zoom

01 / PRODUCT

A stereo system.
A shared centre.

Coda W places a 25 mm aluminium tweeter inside a 130 mm bass/midrange cone. Each speaker uses a 12th-generation Uni-Q array.

Uni-Q array: 130 mm
System power: 200 W / pair
Cabinet H × W × D: 285 × 168 × 268 mm

Bluetooth playback; a cable links the speakers. Inputs include HDMI ARC, optical, USB-C and RCA line / MM phono.

Evidence & model notes ↓

THE ACOUSTIC IDEA

Bring the origins
of sound together.

In a conventional two-way layout, the tweeter and bass/midrange driver occupy different positions. Around the frequencies they share, moving above or below the speaker changes the distance from each driver to your ears.

Uni-Q aims to bring their acoustic origins together. The surrounding cone also forms part of the tweeter’s waveguide. The intent is a smoother transition as you move away from the central listening position. KEF’s Uni-Q explanation ↗

Coincidence does not make a speaker omnidirectional, remove room reflections, or guarantee identical sound in every seat. Real performance still depends on driver directivity, crossover design, cabinet diffraction and the room.

THREE APPROACHES TO SPACE

Open the original 3D study ↗

03 / KEF

Coda W

Coincident geometry

A nested two-way array in each cabinet. A physical left/right pair creates the stereo stage.

Explore Uni-Q ↑

01 / APPLE

HomePod 2

Room-aware rendering

Five beamforming tweeters surround the base. Microphones support room sensing and automatic bass correction.

Explore HomePod ↗

02 / BOSE

Lifestyle Ultra

Direct and reflected sound

Two forward drivers and an up-firing driver combine with TrueSpatial processing to add spatial scale.

Explore Bose ↗

These are architectural distinctions, not a listening-test ranking. All three systems use signal processing.

EVIDENCE / SCOPE

What this model shows.

Product specifications and architectural claims were checked against the primary sources listed here; acoustic performance was not independently measured. The speaker view is my own model, built from the published 285 × 168 × 268 mm cabinet and product photographs: no logo, a plain woven wrap, generic connectors. The driver view is a section reconstructed from KEF’s published descriptions of the Uni-Q architecture, not a teardown or a manufacturing drawing; dimensions KEF does not publish are representative. The path illustration is an idealised calculation, not a validated simulation or measured response.

KEF lists Coda W as 12th-generation Uni-Q; this study does not assume it includes MAT. KEF distinguishes 12th-generation Uni-Q from the later version with Metamaterial Absorption Technology, so the duct here ends in a plain damped chamber rather than MAT.