Wharfedale SFB/3 (1957)

A three-way speaker built into a sand-filled baffle - G. A. Briggs's answer to cabinet resonance, and one of the strangest domestic speakers Britain ever shipped.

Overview

The SFB/3 looks more like a section of wall than a speaker cabinet. SFB stands for sand-filled baffle, and that is what Wharfedale built: a rigid, free-standing baffle with a cavity packed with sand to kill the resonances that plague ordinary wooden enclosures. When the company announced the model in 1957, it described the SFB/3 as a revolutionary three-way system designed by G. A. Briggs himself. The sand fill, it said, eliminated cabinet resonance and produced the "distinctive sound quality" the brand claimed as its signature. Wharfedale's own advertising billed it as a free-standing, sand-filled baffle that was resonance-free, omni-directional, and full-range. That is marketing language, but the idea was genuinely unusual for a domestic speaker of the period.

The driver complement is a three-way array with odd proportions by modern standards: a 12-inch low-frequency driver, a 10-inch mid-range unit, and a 3-inch treble speaker, all specially built and tuned to work together. That big mid-range is the tell. Wharfedale wanted a dedicated driver covering the midband rather than asking a woofer to reach up. The company quoted a frequency range of 30 cps to 20,000 cps, with bass resonance between 30 and 35 cps. Treat those figures as Wharfedale's own claims, not measured results. Period spec sheets were optimistic, and no independent lab numbers survive in the material available here.

In principle, the design avoids the boxy colorations of conventional cabinets. A sand-filled baffle is very stiff and heavily damped, and Wharfedale's "omni-directional" claim points to a dispersion approach that favored even coverage over a pinpoint sweet spot. Whether the SFB/3 fully delivered is hard to verify today, since surviving units are rare and documentation is thin. Audio (September 1957, p.4) ran the launch announcement and reproduced Wharfedale's own specification list, including the 30 cps to 20,000 cps range, the 30-35 cps bass resonance, and the three-driver layout. So the core claims trace to the manufacturer's launch material rather than to later hearsay.

The SFB/3 was not a budget item. British retailers listed it at £39 10s, the same money as Wharfedale's own W3 speaker system. A 1960 dealer price list from The Tape Recorder shows the SFB/3 at £39 10s alongside the Wharfedale Coaxial 12 at £25 and the Golden 10FSB at £8 7s 3d. That puts the sand-filled three-way at the top of the Wharfedale domestic range as stocked by the trade. For that money a buyer got a ready-to-play system, with no cabinet to build and no drivers to match. Wharfedale sold it as a complete, acoustically integrated package, and the period advertising made a point of it arriving assembled and finished.

Audio (July 1958, p.3), presenting a full listing of tested and ready-to-play Wharfedale speaker systems, still listed the SFB/3 in Wharfedale's lineup. It praised the range for a clean, open sound with bass response that smaller systems could not match. The SFB/3 was still being shown years after its 1957 introduction, which suggests a loyal enough following to keep it in the catalogue.

For the modern enthusiast, the SFB/3 is a fascinating if impractical piece. Any surviving example will need the fill checked — sand settles, and a baffle that has lost its damping is no longer doing the job it was designed for. Driver condition is the bigger worry: a 12-inch woofer, 10-inch mid and 3-inch tweeter from the late 1950s are all rebuild candidates, and originality matters enormously to value. This is not a speaker anyone buys to flip. It is a speaker someone buys because they want to hear what Briggs was chasing — a boxless, resonance-free presentation from an era when British speaker design was still very much an engineering experiment. Approach it as a piece of audio history that happens to play music, and it makes sense. Approach it as a modern hi-fi purchase, and it will disappoint.

eBay Listings

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.

Related Models

• Wharfedale 100
• Wharfedale 20
• Wharfedale CHEVIN (1978)
• Wharfedale DENTON-3 (1994)
• Wharfedale MACH 9
• Braun AUDIO-1 (1965)
• Braun AUDIO-250 (1965)
• Magnavox Component Systems (1972)
• Acoustic Research AR (1967-1976)
• Acoustic Research 11