Audio Research D-100
Little is documented about the Audio Research D-100. No owner's manual, brochure, or period review has turned up, and the model is absent from the usual audio history references. What survives is a handful of classified advertisements in Audio magazine between 1977 and 1981 — enough to confirm the D-100 existed, but not enough to say with certainty what it was.
The earliest known sighting is a June 1977 ad offering "Audio Research D-100s" at $850 each, listed alongside an EC-4A electronic crossover (Audio, June 1977, p.145). By March 1981, a "mint" D-100 was advertised at $1,700 (Audio, March 1981, p.72). A "D-100 B" appeared in the classifieds that spring at $500 — the same ad ran in the May and June issues (Audio, May 1981, p.71; June 1981, p.90). An October 1980 listing for a "D-1008" at $1,700 might be a misprint or OCR slip for this model, but that's speculation. The price spread from $500 to $1,700 probably reflects condition, accessories, and the B revision, though nothing in the record pins it down.
The D-100's component type is not documented. The D-series naming matches Audio Research's power-amplifier line of the era — the D-79, D-300, and D-1004 — and the classified context is consistent with an amplifier, but no source confirms it. The D-100 remains one of the less-documented entries in the Audio Research catalog: confirmed by marketplace evidence, otherwise uncharacterized.
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