KEF Reference 104/2 (1984–1991): The Coaxial Crown Jewel of British Hi-Fi

Name: KEF Reference 104/2
Brand: KEF

A flagship floor-standing speaker that redefined point-source imaging with its Uni-Q driver, setting a benchmark for coherence and musical truth in the golden age of British loudspeaker design.

Overview

The KEF Reference 104/2 wasn’t just another high-end speaker from the 1980s—it was a statement. Born in Maidstone, Kent, in 1984, it stood as the flagship of KEF’s Reference series, a lineage that had already earned respect with the KEF Reference 104/1. But where its predecessor laid the groundwork, the 104/2 refined it into something bordering on the sublime. This was the speaker that proved KEF’s Uni-Q coaxial driver wasn’t a clever gimmick, but a genuine leap toward sonic authenticity. Audiophiles, recording engineers, and even BBC studios took notice: this was a speaker that didn’t just reproduce music—it hosted it.

At a time when many high-end speakers were chasing bass extension or sheer scale, the 104/2 pursued something more elusive: coherence. By mounting a 31mm T27 tweeter directly at the acoustic center of a 125mm B110 midrange cone, KEF achieved a near-perfect point source. The result? A soundstage so precise it could make a solo violinist appear in your living room with unnerving realism. Paired with dual 165mm B402 bass drivers in a bass-reflex cabinet, the 104/2 delivered both authority and finesse. It wasn’t the loudest speaker, nor the deepest, but it was often described as the most “believable.” At $2,800 per pair in 1985 (over $8,000 today), it wasn’t cheap—but for those who heard it, the price felt justified.

Specifications

Type	3-way, bass-reflex floor-standing loudspeaker
Drivers	1 x 31mm T27 tweeter, 1 x 125mm B110 midrange, 2 x 165mm B402 bass
Crossover Frequency	700 Hz, 3.2 kHz
Frequency Response	45 Hz - 20 kHz ±3 dB
Nominal Impedance	8 ohms
Minimum Impedance	5.3 ohms
Sensitivity	87 dB (2.83V, 1m)
Recommended Amplifier Power	30–150 watts
Harmonic Distortion	<1% (90 dB, 1m, 300 Hz – 20 kHz)
Dimensions	980 mm (h) x 240 mm (w) x 300 mm (d)
Weight	24 kg per cabinet
Cabinet Finish	Rosewood, Walnut, Black Ash, Cherry (real wood veneers)

Key Features

Uni-Q Coaxial Driver: The heart of the 104/2’s magic. By aligning the tweeter’s acoustic center with the apex of the midrange cone, KEF achieved time coherence across the critical midrange and treble. This wasn’t just theory—on well-recorded jazz or chamber music, instruments occupied fixed, stable positions in space. No smearing, no “tweeter-in-a-hole” effect. It was, in the words of one reviewer, “like removing a pane of glass from in front of the music.”
Computer-Optimized Crossover: In 1984, “computer-optimized” still sounded like science fiction. KEF used early CAD tools to model phase response and impedance, resulting in a crossover that used high-grade metal-film resistors and polypropylene capacitors. The goal? Minimize signal degradation and maintain linearity. The result? A crossover that didn’t just divide frequencies—it preserved intent.
Real Wood Veneer Finishes: These weren’t paper-thin laminates slapped on particleboard. The 104/2 came in rich rosewood, deep walnut, elegant black ash, and warm cherry—all real veneers over a rigid MDF cabinet. They aged beautifully, developing a patina that matched their sonic character: refined, mature, and deeply British.
Dual Bass Drivers: While the coaxial unit handled the upper registers, two 165mm B402 bass units provided controlled, articulate low end. The bass-reflex port was tuned to 45 Hz, giving the 104/2 surprising authority for a speaker of its era—especially when paired with a good 50-watt tube amp.

Historical Context

The mid-1980s were a battleground for speaker supremacy. On one side stood the B&W 801, the “monitor speaker” favored by Abbey Road Studios, with its massive size and dramatic looks. On the other, KEF offered a quieter revolution: precision over power, integration over spectacle. While B&W relied on separate drivers and a massive cabinet, KEF bet on integration and time alignment. The 104/2 wasn’t trying to fill a cathedral—it wanted to recreate the intimacy of a studio control room.

It succeeded. The 104/2 was a direct evolution from the KEF Reference 104/1, but with refinements that mattered: improved driver matching, tighter tolerances, and a crossover that tamed the slight harshness some heard in early Uni-Q designs. Then, in 1987, KEF released the KEF Reference 104/2S, a variant with a revised crossover that improved tweeter protection and smoothed the upper mids. It wasn’t a new model—just a quiet upgrade for those paying attention. By 1991, the 104/2 bowed out for the KEF Reference 104/2a, which brought updated drivers and a more modern aesthetic. But many argue the 104/2 was the purest expression of KEF’s coaxial vision—before marketing and cost-cutting began to nibble at the edges.

Collectibility & Value

Today, the KEF Reference 104/2 is a sought-after classic. With “uncommon” rarity and “high” desirability, a well-maintained pair can fetch between $1,200 and $2,500 in 2025. But caveat emptor: these are 30+ year-old speakers, and time has not been kind to all components. The foam surrounds on the B402 bass drivers are notorious for disintegration—look for units that have been professionally re-foamed. Even more critical: early T27 tweeters suffered from diaphragm fatigue, leading to a brittle, “tizzy” high end. Later production models (especially in the 104/2S) improved this, but it’s still a common failure point.

When buying, prioritize originality and condition. Original veneers with minimal fading, intact grilles, and clean binding posts (the 104/2S upgraded to better-quality posts) add value. Check for repair history—many have been recapped or had crossovers rebuilt, which isn’t necessarily bad, but know what you’re getting. And listen if possible: a good 104/2 still outperforms many modern speakers in imaging and tonal balance. They’re not for bassheads or home theater junkies, but for purists who value coherence and musicality, the 104/2 remains a revelation. Just don’t expect them to play EDM at reference volume—they were built for Vaughan Williams, not Skrillex.