Tannoy System 12 DMT
A Dual Concentric studio monitor from the era when Tannoy rebuilt its point-source reputation around a space-frame cabinet and a very particular acronym.
Overview
The System 12 DMT belongs to Tannoy's Monitor Series, one of six speaker types the company grouped under that banner — alongside the System 2 NFM, System 8 NFM, System 10 DMT, System 15 DMT, and System 215 DMT. Tannoy positioned the whole line as the product of a decade of research into what it called Differential Material Technology, and the company's own description of DMT is worth parsing carefully: it involves isolating any moving or vibrating component using a surround or mount made from a different material, or a fused bond that generates a differential, with the stated aim of eliminating unwanted sonic characteristics. Whether or not that framing convinces a skeptical engineer, it's the design principle Tannoy hung the entire series on.
What sits inside every one of those cabinets is the heart of the matter: redesigned Dual Concentric drivers. That's the Tannoy signature — a tweeter mounted coaxially within the woofer so the two radiators share a point source. Sound & Communication (September 1991, p.40) noted the growing number of point-source driver designs on the market as evidence that Tannoy's long emphasis on phase-coherent drivers was well placed, and described the company's attention to materials, adhesives, and cabinet construction, its use of Differential Material Technology and extensive CAD modeling, and its "Tangerine" phasing plug — the latter designed to reduce high-frequency loss and improve dispersion. The same piece observed that Tannoy's approach to crossover network design was a subject of its own.
The cabinet itself is a high-density MDF space-frame, and the terminal panel is bi-wired. Crossovers are hard-wired, the internal wiring carries polymide insulation, and the driver's magnetic gap is cooled — details that read like the checklist of a company that expected these boxes to spend their lives at volume in a working room rather than in a listening salon.
There is no reliable published figure here for power handling, impedance, sensitivity, frequency response, or driver dimensions, and this archive won't invent them. What can be said is that the System 12 DMT was a working tool, not a domestic curiosity — it turns up in the equipment inventories of actual facilities. Mix (March 1992) listed a pair of System 12 DMTs alongside Westlake BBSM10s and Radian MM8s in the monitor complement of a Seattle studio, and the same issue reported that Manhattan's Videomix installed the System 12 DMT as the reference monitors in a new digital editing suite serving clients including ABC, MTV, PBS, TNT, Sony, and IBM. When a monitor gets specified into post-production rooms with that kind of client roster, it's being judged on translation and stamina, not on how it flatters a solo vocal.
Mix (December 1991) also ran the System 12 DMT in a "Just Arrived" new-gear listing, which places its market entry in that window.
For anyone chasing a pair today, the practical picture is the usual one for a monitor of this class: the Dual Concentric driver is the whole value proposition and the whole risk. The coax assembly is not a field-serviceable part in the way a separate dome tweeter is, and a pair that has lived in a control room has lived hard. The bi-wired terminal panel and hard-wired crossover mean a careful inspection of the wiring and terminations is worth more than a cosmetic once-over. The MDF space-frame is sturdy but heavy, and shipping a pair is a freight problem, not a parcel problem. None of that is unique to Tannoy — it's the cost of admission for any serious point-source studio monitor of the period.
What the System 12 DMT represents is a specific moment in Tannoy's thinking: the point where the company took its Dual Concentric heritage and wrapped it in a modern, CAD-modeled, materials-obsessed studio package aimed squarely at the professional market. The trade-press placement in post houses and recording rooms confirms it did that job. The absence of hard published specs in the surviving record is the frustration — but the design story, the driver philosophy, and the professional adoption are all documented, and that's enough to understand what this speaker was for.
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