Yamaha DX71IFD
The name turns up in 1989 studio gear lists, but almost nowhere else.
Overview
Up front: the Oberheim DX-71IFD barely exists as a documented object. It appears in period studio directories - most notably the gear inventories printed in Mix magazine's 1989 studio listings - where it's repeatedly logged alongside Yamaha TX802s, Roland D-550s, and Akai S900 samplers. Kiva Recording Studio in Memphis listed one among its instruments. Technisound Productions in Westfield, New Jersey advertised a DX71IFD loaded with "1,500+ sounds." A New Haven production outfit claimed two of them. Sound Situation in Glastonbury described offering FM synthesis on a DX71IFD alongside a DX7 and DX100. Automated Sound Studios in New York ran one with a library. That's the extent of the trail.
What the name actually denotes is unresolved. The studio listings consistently group it with FM synthesizers and samplers, and the "71" and "IFD" suffixes point toward Yamaha's FM nomenclature rather than anything Oberheim ever stamped on a drum machine. The most defensible reading, given how the period sources used it, is that "DX-71IFD" was a shorthand some studios and directory compilers used for a Yamaha-derived FM instrument in their racks - not an Oberheim product at all. That reading is inference, not documentation.
Here is what can be stated without hedging. No manufacturer documentation, no spec sheet, no owner's manual, and no independent review of an Oberheim DX-71IFD has surfaced in the archive's research. There are no confirmed production years, no original price, no polyphony figure, no oscillator count, no filter description, no dimensions, no weight. The model does not appear in Oberheim's own brand index of OB-series synths, SEM modules, or the Four and Eight Voice systems. It is a name in a studio directory and nothing more.
The period evidence suggests that whatever sat in those 1989 racks was valued for its sound library. Technisound's "1,500+ sounds" phrasing and Automated Sound's "w/library" note both point to a preset-heavy FM instrument rather than an analog Oberheim. Anyone who finds a unit labeled DX-71IFD should photograph the rear panel and any silkscreened model plate before assuming an Oberheim provenance. The archive would like to see it.
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